304 pubblicazioni classificate nel seguente modo:

Turbulence in Rivers
Rivers – Physical, Fluvial and Environmental Processes
Autore/i: Franca, M.; Brocchini, Maurizio
Editore: Springer International Publishing Switzerland
Luogo di pubblicazione: Cham, Heidelberg, New York, Dordrecht, Lndon
Classificazione: 2 Contributo in Volume
Abstract: The study of turbulence has always been a challenge for scientists working on geophysical flows. Turbulent flows are common in nature and have an important role in geophysical disciplines such as river morphology, landscape modeling, atmospheric dynamics and ocean currents. At present, new measurement and observation techniques suitable for fieldwork can be combined with laboratory and theoretical work to advance the understanding of river processes. Nevertheless, despite more than a century of attempts to correctly formalize turbulent flows, much still remains to be done by researchers and engineers working in hydraulics and fluid mechanics. In this contribution we introduce a general framework for the analysis of river turbulence. We revisit some findings and theoretical frameworks and provide a critical analysis of where the study of turbulence is important and how to include detailed information of this in the analysis of fluvial processes. We also provide a perspective of some general aspects that are essential for researchers/practitioners addressing the subject for the first time. Furthermore, we show some results of interest to scientists and engineers working on river flows.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234417

Advances in fluid mechanics for offshore engineering: a modelling perspective
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A: MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Autore/i: Brocchini, Maurizio; Faltinsen, O. M.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205528

Whole-wavelength description of a gravity-wave-driven flow over permeable beds
Proceeding of the "17th International Symposium on Applications of Laser Techniques to Fluid Mechanics"
Autore/i: Miozzi, Massimo; Corvaro, Sara; Postacchini, Matteo; Brocchini, Maurizio
Editore: Instituto Superior Tecnico, Lisboa, Portugal
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/233411

Uno studio a scala naturale dell'idro-morfodinamica estuarina: esperimenti di campo alla foce del fiume Misa
XXXIV Convegno Nazionale Idraulica e Costruzioni Idrauliche
Autore/i: Brocchini, Maurizio; Colantoni, J.; Postacchini, Matteo; Reed, A. H.; Lorenzoni, Carlo; Mancinelli, Alessandro; Soldini, Luciano; Corvaro, Sara; Russo, Aniello; Moriconi, Giacomo; Coluccelli, Alessandro; Paroncini, Paolo; Ortenzio, Francesca; Busca, Claudia
Editore: Zaccaria Editore
Luogo di pubblicazione: Napoli
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205867

Sediment transport and morphodynamics generated by a dam-break swash uprush: Coupled vs uncoupled modeling
COASTAL ENGINEERING
Autore/i: Postacchini, Matteo; Othman, I. K.; Brocchini, Maurizio; Baldock, T. E.
Classificazione: 1 Contributo su Rivista
Abstract: The present work analyzes the hydro-morphodynamics characterizing the swash region during the uprush stage. A comparison is illustrated between the sediment transport measured in a series of dam-break experiments and that predicted by the numerical hydro-morphodynamic model of Postacchini et al. (2012). The primary aim is to investigate the differences arising between the weakly coupled or uncoupled model and the measurements, in terms of hydrodynamics, tip celerity and sediment transport. The hydrodynamics are well described by the model and results have been used to calibrate both friction factor and subgrid turbulent viscosity. Comparison of numerically-computed tip celerity with experimental data reveals a fairly good agreement, i.e. a mean error of about 10%, while modeled sediment transport differs by about 40% from the available data. No evident differences are found between results obtained from the coupled and uncoupled model runs (2% for the celerity and 11% for the sediment transport rate at the tip), suggesting that for the specific flow under investigation, at the leading edge of the swash front, hydro-morphological coupling is not an issue of fundamental importance. However, for the special case here of a swash forced by a dam-break, scour occurs at the dam location, and in this case the erosion of the bed is significantly larger in the uncoupled model.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/188304

Fluid-particle interaction and generation of coherent structures over permeable beds: an experimental analysis
ADVANCES IN WATER RESOURCES
Autore/i: Corvaro, Sara; M., Miozzi; Postacchini, Matteo; Mancinelli, Alessandro; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: We study the dynamics of the oscillatory bottom boundary layer (BBL) that develops at a porous bed under the action of propagating water waves (also known as “ventilated BBL”). In particular, experimental tests of a ventilated BBL generated over a permeable bed made of regular plastic spheres are analysed. With the purpose of characterizing typical dynamics of nearshore waves evolving over dissipative seabeds, we focus on one specific forcing condition, characterized by large nonlinearities and vorticity generation, and expect that such dynamics be qualitatively similar also for other wave regimes. Particle tracking enables an accurate definition of the hydrodynamics generated over the porous medium with specific focus on Eulerian velocity and vorticity fields and on Lagrangian particle trajectories. Nearbed velocity components are strongly influenced by the bed configuration (sphere caps) and are characterized by small-scale oscillations due to the presence of coherent structures over the interstices. Counter-rotating vortex sheets are generated and evolve during the entire wave period; their thickness grows rapidly when flow injection from the bed occurs, while it remains constant under the influence of in-bed flow suction. The evolution of near-bed particles is influenced by strain or vortex-dominated regions. When the intensity of the vortices just outside the BBL is large (generally after flow inversion), the momentum associated to the rotation of the lower layer of vortices in the BBL is comparable with that of the passive tracers, hence the particles are captured and their original trajectories are modified, jumping to a different layer. On the contrary when strain regions are dominant, particles are restricted in the same vorticity layer until sweep or ejection turbulent processes are observed and anomalous particle transport occurs from lower to higher vortex layers and vice versa. The latter occurs during the entire wave cycle, becoming the dominant process, while the former occurs before flow inversion and close to the porous bed. This result reveals that nearbed small-scale phenomena are weakly influenced by the wave mean flow. A detailed description of fluid suction and injection is proposed in terms of the mean flow dynamics (at wave scale), while the actual inflow/outflow of particles at the bed is seen to depend on local, small-scale flow properties. Suction and injection are generated during positive and negative water surface elevations and either squeeze or expand the flow downward/upward. The suction/injection perturbations contribute to the triggering of sweep and ejection events. Suction is mainly concentrated very close to the bed, injection is rapidly transported above the BBL, but the highest turbulence occurs in correspondence of suction events.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/184303

A wave-by-wave analysis for the evaluation of the breaking-wave celerity
APPLIED OCEAN RESEARCH
Autore/i: Postacchini, Matteo; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: The paper gives an overall description of the breaking-wave celerity on the basis of a wave-by-wave analysis that has been performed by using field data collected during the ECORS Project (Truc Vert Beach, France, 2008). Data coming from two pressure sensors have been analyzed with the aim to correlate, after a zero-crossing analysis, each wave of both signals. The method is based on a first correlation between 10 ' time windows of both signals and, then, on the individuation of the correct time lag for each wave. Such data, which reveals a quasi-gaussian behavior of the breaking wave celerity, have also been used to relate the wave celerity with suitable wave characteristics, and comparisons are made with the most common formulas that can be found in the literature. The wave-by-wave method, validated by means of suitable laboratory test data, gives good results in the evaluation of the celerity, especially when it is made to depend on both a velocity scale and the wave non-linearity parameter. Further, a comparison with literature models used for the prediction of breaking wave celerity suggests good performances of both solitary-wave (correlation coefficient R-2 = 0.79) and shock-wave (R-2 = 0.71) theories, that give results well matched to the field data.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/188303

A shallow-water sloshing model for wave breaking in rectangular tanks
JOURNAL OF FLUID MECHANICS
Autore/i: Antuono, M.; Bardazzi, A.; Lugni, C.; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: We propose a simple, robust and efficient sloshing model that accounts for breaking phenomena evolving in rectangular tanks and in shallow-water conditions. The model has been obtained by applying Fourier analysis to Boussinesq-type equations and using an approximate analytic solution for the vorticity generated by wave breaking. The toe of the breaker and the intensity of the vorticity injected at the free surface are computed on the basis of literature results for coastal-type breakers. A first experimental campaign has been used to calibrate the turbulent viscosity of the sloshing model, while a second campaign has been run as final validation. The overall good agreement between the numerical outputs and the experimental data confirms the reliability and robustness of the proposed model.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/196706

A natural-scale study of cohesive sediment transport: The Misa River case
RIVER FLOW 2014 - Proceedings of the International Conference on Fluvial Hydraulics
Autore/i: Brocchini, Maurizio; Russo, Aniello; Calantoni, J.; Reed, A. H.; Postacchini, Matteo; Lorenzoni, Carlo; Corvaro, Sara; Mancinelli, Alessandro; Moriconi, Giacomo; Soldini, Luciano
Editore: CRC Press
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205869

Vorticity generation due to cross-sea
JOURNAL OF FLUID MECHANICS
Autore/i: Postacchini, Matteo; Brocchini, Maurizio; Soldini, Luciano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/166702

Modeling and Analysis of an Electrically Actuated Microbeam Based on Nonclassical Beam Theory
JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS
Autore/i: Belardinelli, P.; Lenci, Stefano; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/155109

Flow dynamics on a porous medium
COASTAL ENGINEERING
Autore/i: Corvaro, Sara; E., Seta; Mancinelli, Alessandro; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: In this paper, which can be regarded as a companion of that by Corvaro et al. (2010), experimental results on the internal flow kinematics of waves which propagate on different types of beds, focusing on the nearbed dynamics induced by a porous bed, are illustrated and analyzed. The porous bed induces a major attenuation in the upstream-to-downstream direction of both wave height (≈ 30%) and internal flow velocity (≈ 50% for the maximum and minimum phases). The relationship between the wave height and the internal flow attenuation has been analyzed by means of wave energy arguments. We also found that the averaged reduction of mean flow between the smooth and porous-bed cases is approximately of 45% and 55%, respectively, for the horizontal and vertical velocity components. The stronger reduction of the vertical velocity is due to a significant variation of this velocity profile with respect to what occurs on an impermeable bed. An optical technique is used to extract the flow velocity from suitable video images; the wave dynamics on the porous medium is analyzed by evaluating the mean wave flow, the turbulence and the vorticity fields over the layer. The turbulence, indirectly characterized in terms of instantaneous velocity spectra, is found to be largely confined within the bottom boundary layer, located at a position deeper than the peaks of the mean flow. From the analyses of the instantaneous velocity spectra a clear anisotropy and inhomogeneity are found for the nearbed turbulence. This is confirmed by the presence, in the bottom boundary layer, of elongated coherent vortical structures whose intensity is the maximum during the wave crest and trough phases.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/184304

Fluid-particle interaction and generation of coherent structures over permeable beds: an experimental analysis
Proceedings of "Two-Phase Modelling for Sediment Dynamics In Geophysical Flows" - THESIS-2013 -S.H.F.
Autore/i: Postacchini, Matteo; Corvaro, Sara; Miozzi, M.; Mancinelli, Alessandro; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/164730

A natural-scale analysis of estuarine cohesive sediments: the EscoSed project
8th international SedNet conference - Innovative sediment management: how to do more with less
Autore/i: Brocchini, Maurizio; Calantoni, J.; Postacchini, Matteo; Reed, A. H.; Lorenzoni, Carlo; Russo, Aniello; Mancinelli, Alessandro; Corinaldesi, Valeria
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/164733

Bore-generated macrovortices on erodible beds
JOURNAL OF FLUID MECHANICS
Autore/i: Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: The interaction of free-surface bores and an erodible porous channel bed in a shallow-water flow is analysed based on the assumption of weak coupling between free-surface discontinuities and bed discontinuities and on the simplest closure for the sediment transport rate (cubic with the mean flow velocity). It is shown that free-surface bores with finite cross-stream extent can evolve over the erodible bed by generating vertically oriented macrovortices in a manner similar to, but more complex than, that of free-surface bores of finite cross-stream extent over a rigid channel bottom. An equation for the potential vorticity is derived, which shows that on an erodible bed the vortices are generated by a combination of various mechanisms related to energy dissipation of both surface bores and bed discontinuities. The model is verified and the physics explored by comparison with a number of numerical simulations, typical of both riverine (dam-break test and pit test) and nearshore (bore on a beach test) flows, and with previously published experimental results. For all cases a fairly good agreement is found between the analytically estimated potential vorticity and that computed numerically.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/122262

Experimental investigation of the wave-induced flow around a surface-touching cylinder
JOURNAL OF FLUIDS AND STRUCTURES
Autore/i: M., Mattioli; Mancinelli, Alessandro; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: The wave-induced flow around a circular cylinder near both a rigid wall and an erodible bed is experimentally investigated using Particle Tracking Velocimetry (PTV). The aim of this study is to gain quantitative information on the local mean flow, the vorticity dynamics and the evolution of the erodible bed. The flow is characterized in terms of the Keulegan–Carpenter (KC), Reynolds (Re) and Ursell (Ur) numbers. The effects of changing these parameters over the ranges 1Scheda della pubblicazione: https://iris.univpm.it/handle/11566/86367

Beyond Boussinesq-type equations: Semi-integrated models for coastal dynamics.
PHYSICS OF FLUIDS
Autore/i: M., Antuono; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: A novel approach for the description of both wave propagation and flow circulation in the nearshore zone has been defined. This is based on an integro-differential system which, at the leading-order, coincides with classical depth-averaged models (e.g., Boussinesq-type models) and, in addition, describes flow deviations from the depth-averaged values. Thanks to this feature, the proposed system enables exact calculation of the linear dispersion relation, of the linear shoaling coefficient, and of second-order nonlinear solutions for monochromatic waves. A simplified version of the original system has also been proposed. This latter model is exact up to the first order and predicts a linear shoaling coefficient which is comparable with the most advanced, fully nonlinear Boussinesq-type models. The general approach, which can be exploited to obtain a family of models, has clear computational advantages over those which solve the flow over the vertical and improves the flow description accuracy of typical depth-averaged models.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/86368

A Novel Two-fluid Model for the Identification of Possible Multiple Solutions in Slightly Inclined Pipelines
INTERNATIONAL JOURNAL OF NONLINEAR SCIENCES AND NUMERICAL SIMULATION
Autore/i: Corvaro, Sara; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: A novel mechanistic two-fluid model (CB model) similar, in spirit, to the Taitel and Dukler [1, 2] (TD model), for the identification of possible multiple solutions of a multi-phase (gas-liquid) stratified flow in slightly inclined pipelines, is proposed. While Blasius-type closures are used in the TD model to represent the wall friction coefficients, the newly-implemented CB model makes use of Colebrook-White-type closures. Moreover, different closures for the interfacial shear are also employed in the CB models. The predictive capabilities of the CB model have been tested by using several experimental data, finding a better agreement between measured and calculated data than that existing when the TD model is used. The region of multiple solutions is influenced by the closures in use, such a dependence is more evident when different interfacial friction factors are used. Moreover, for the CB model also the fluid mixture in use influences the boundaries of the non-uniqueness region, while by using the TD model the multiple-solution region is unchanged. The choice of closures for the interfacial friction strongly influences the holdups, the Andritsos and Hanratty [10] correlation significantly shifting the non-uniqueness region to small values of the inclination parameter. Such a behaviour is more and more significant with the increase of the superficial gas velocity, even if for values of the inclination parameter within the range of inclinations for stratified flows (i.e. less than about 30° from the horizontal [11]), multiple solutions were not found. Finally, for the fluid mixture and flow conditions analyzed, multivalued solutions are obtained only for upward flows. Moreover, the portion of multiple-solution region interested by co-current flow (that occurs for slightly upward and downward pipes) is rather small, so that the operational point unlikely falls within such a region in the case of the studied hydrocarbon gas-liquid mixture.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/88582

Dynamical characteristics of an electrically actuated microbeam under the effects of squeeze-film and thermoelastic damping
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
Autore/i: Belardinelli, Pierpaolo; Brocchini, Maurizio; Demeio, Lucio; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Abstract: The static and dynamic behavior of a MEMS subjected to thermoelastic and squeeze-film effects is investigated. We analyse the various engineering aspects which interact in a slender fixed–fixed microbeam; major attention is devoted to the modeling of such a multiphysics system, including the mechanical, electrical, thermoelastic and fluid-dynamic properties with their couplings. The static solution is obtained numerically by a finite-difference technique. The variation of the static deflection with respect to the voltage increment, in the presence of geometric nonlinearites, is studied first. Numerical results on the magnitude of thermoelastic damping (TED) and squeeze-film damping are obtained and examined with a parametric analysis. The effect of different relaxation times imposed on the TED, both in pull-in and non pull-in regime, is studied. The squeeze-film damping is modeled by means of the Reynolds equation and the large pressure regime is investigated. We then present a comparison between the different sources of damping, evaluating their relative contribution to the system.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/107262

The hydro-morphodynamic response of a protected beach subject to sea storms: a numerical study
PROCEEDINGS OF THE 35TH IAHR WORLD CONGRESS, VOLS III AND IV
Autore/i: Postacchini, Matteo; Russo, Aniello; Sandro, Carniel; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Sea storms are becoming more and more important in the economy of coastal areas, because they heavily affect both maintenance and life of the defense/touristic facilities, especially if they take place during the summer period. In conjunction with this, the design of traditional coastal defense structures is crucial for the protection of such facilities. The present study, based on numerical simulations performed by means of an innovative shallow-water numerical hydro-morphodynamic solver, explores the overall response of a protected beach to sea storms. Numerical tests have been run with the purpose of evaluating both i) the effect of real-life sea storms with different spectral characteristics, and ii) the influence of the positioning of shore-parallel submerged breakwaters on the beach morphology. The results of the simulations have revealed that erosion/accretion patterns depend weakly on the different sea storm conditions here used. On the other hand, the morphodynamics induced around the barriers is strongly influenced by the breakwater positioning: for the forcing here analyzed, the more the structures are offshore located, the more the bed variation is intense. On the opposite, the swash zone morphology is weakly influenced by the positioning of the breakwaters.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247226

Numerical modeling of the influence of the beach profile on wave run-up
JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING-ASCE
Autore/i: Soldini, Luciano; M., Antuono; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: An analysis of the run-up over different beach profiles is performed to evaluate the influence of the seabed shape on shore flooding. The analysis was carried out on the basis of numerical solutions of the nonlinear shallow water equations. The chosen solver was shown to provide reliable (both quantitatively and qualitatively) run-up results by comparing numerical solutions (of both solitary and regular waves) with the only available analytical solution forced by a localized topographic change. The run-up patterns on both a natural beach profile and three simpler and schematic profiles derived from it were evaluated. Different wave conditions (both random and groups) were used for a total amount of 96 different cases of inundation. Results are expressed in terms of both maximum (Zmax) and steady-state (Zsteady) run-up. It is found that both types of run-up depend on the offshore variable sqrt(H0L0), as suggested by several available studies, and that, for all tested cases, random waves induce the largest Zmax compared with the wave groups. The largest Zmax is induced by the composite-planar profile for both random waves and groups. An important similarity is found for both Zmax and Zsteady induced by all wave types over the natural and equilibrium profiles, giving further support to the use of an equilibrium profile as representative of the natural profile. Attempts at finding an equivalent planar beach highlight unavoidable difficulties in choosing such a profile and reinforce the idea that the concept of an equivalent planar beach cannot bridge dynamics occurring from the depth of closure to the run-up. More likely, such a concept is only suitable to describe dynamics that are local to the foreshore.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/82212

A reasoned overview on Boussinesq-type models: the interplay between physics, mathematics and numerics
PROCEEDINGS - ROYAL SOCIETY. MATHEMATICAL, PHYSICAL AND ENGINEERING SCIENCES
Autore/i: Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: This paper, which is largely the fruit of an invited talk on the topic at the latest International Conference on Coastal Engineering, describes the state of the art of modelling by means of Boussinesq-type models (BTMs). Motivations for using BTMs as well as their fundamentals are illustrated, with special attention to the interplay between the physics to be described, the chosen model equations and the numerics in use. The perspective of the analysis is that of a physicist/engineer rather than of an applied mathematician. The chronological progress of the currently available BTMs from the pioneering models of the late 1960s is given. The main applications of BTMs are illustrated, with reference to specific models and methods. The evolution in time of the numerical methods used to solve BTMs (e.g. finite differences, finite elements, finite volumes) is described, with specific focus on finite volumes. Finally, an overview of the most important BTMs currently available is presented, as well as some indications on improvements required and fields of applications that call for attention.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/122063

Transversal and longitudinal mixing in compound channels.
WATER RESOURCES RESEARCH
Autore/i: G., Besio; A., Stocchino; S., Angiolani; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: An experimental campaign, based on particle image velocimetry (PIV) measurements of free-surface velocities, forms the basis for an analysis of the mixing processes which occur in a compound-channel flow. The flow mixing is characterized in terms of Lagrangian statistics (absolute dispersion and diffusivity) and of the related mean flow characteristics. Mixing properties strongly depend on the ratiorh between the main channel flow depth (h*mc) and the floodplain depth (h*fp), and three flow classes can be identified, namely shallow, intermediate, and deep flows. In the present study the large time asymptotic behavior of the mixing characteristics is analyzed in terms of the absolute diffusivity in order to characterize typical values of longitudinal and transversal diffusivity coefficients. Various sets of experiments, which cover a wide range of the governing physical parameters, have been performed and the asymptotic values of the absolute diffusivity have been evaluated. The results are then compared with several studies of flow dispersion for both the longitudinal diffusivity coefficient and the transversal turbulent mixing coefficient. The present results highlight a stronger dependence of such coefficients with the flow-depth ratio than with the flow regime (Froude number).
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/86369

Small-scale dynamics and fluid-particle interaction around a cylinder placed over a porous seabed
50th European Two phase flow group meeting 2012
Autore/i: Mattioli, M.; Postacchini, Matteo; Corvaro, Sara; Mancinelli, Alessandro; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/164739

Analisi sperimentale della vorticità indotta dal moto ondoso su una tubazione posata su fondo scabro e permeabile
Atti del XXXIII Convegno di Idraulica e Costruzioni Idrauliche
Autore/i: Mattioli, M.; Corvaro, Sara; Brocchini, Maurizio; Mancinelli, Alessandro
Editore: EdiBios
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/81626

Un'analisi preliminare sul ruolo della vegetazione nell'idrodinamica dei canali a sezione composta
Atti del XXXIII Convegno Nazionale di Idraulica e Costruzioni Idrauliche
Autore/i: Soldini, Luciano; Postacchini, Matteo; Brocchini, Maurizio
Editore: EdiBios, Cosenza, Italia
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/80053

Dispersion of passive tracers in compound channels
Proceedings of the IAHR River Flow Conference
Autore/i: S., Angiolani; G., Besio; A., Stocchino; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/107264

Bore-induced macrovortices over a planar beach: the cross-sea condition case
Proceedings of the 33rd International Conference on Coastal Engineering 2012
Autore/i: Postacchini, Matteo; Brocchini, Maurizio; Soldini, Luciano
Editore: ASCE-COPRI Coastal Engineering Research Council
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Wave breaking over submerged topographic obstacles leads to vorticity generation and, at times, to the generation of strong offshore-directed rip currents. The generation of finite-length breakers may also be induced by the positive interaction of wave trains propagating to shore with a relative angle. Such an interaction gives rise to a short-crested system, this, in turn, generating both breakers of finite crossflow length and an intense associated vorticity. We here analyze such a vorticity generation mechanism specifically focusing on the location where wave breaking occurs. To this purpose we both derive a simple theory, based on the well-known theory of wave ray propagation, and perform ad-hoc numerical simulations, using a NSWE (Nonlinear Shallow Water Equations) solver. A fairly good comparison between such preliminary theoretical and numerical results suggests that the present work be used as the basis for future analyses of vorticity generation by cross-seas.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/128723

On the role of the Chezy frictional term near the shoreline
THEORETICAL AND COMPUTATIONAL FLUID DYNAMICS
Autore/i: Antuono, M.; Soldini, Luciano; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: The behavior of the Chezy frictional term near the shoreline has been studied in detail. An asymptotic analysis valid for water depths going to zero clearly shows that the use of such a term implies a non-receding motion of the shoreline. This phenomenon is induced by a thin layer of water which, because of frictional forces, remains on the beach and keeps it wet seaward of the largest run-up. However, the influence of such a frictional layer of water on the global wave motion is very weak and practically negligible for most of the swash zone flow dynamics. The existence of a non-receding shoreline has led to some clarifications on the role of some ad-hoc tools used in numerical models for the prediction of the wet/dry interface.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/63436

Experimental investigation of the nearbed dynamics around a submarine pipeline laying on different types of seabed: the interaction between turbulent structures and particles
ADVANCES IN WATER RESOURCES
Autore/i: M., Mattioli; J. M., Alsina; Mancinelli, Alessandro; M., Miozzi; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: The role of sediment particle dynamics on the overall mechanics of flow-sediment-pipeline interactions has been investigated on the basis of dedicated laboratory experiments, of which one sample case has been analyzed in detail to provide a significant insight in the fundamental dynamics. Particle Tracking Velocimetry (PTV) has been used to study the seeded flow and the sediment particle dynamics. Turbulent structures around the pipeline have been characterized in terms of the spanwise component of the vorticity, of the Okubo-Weiss parameter and of the Reynolds stresses. It is shown that the vortical structures which dominate the flow around the pipeline generate sweeps and ejections associated to clockwise/anticlockwise rotating vortices. Clockwise vortices are observed downstream of the pipeline during flow acceleration phases (positive flow), anticlockwise vortices shed upstream of the pipe during flow deceleration phases (negative flow). These structures are seen to largely influence the sediment dynamics near the bed, in particular their entrainment from the bed with particles captured by ejections and, settling to the bed with particles captured by sweeps. The presented results highlight the important influence of turbulent structures in the erosion process around the pipeline.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/80088

Dynamics of a Micro Electrical Mechanical System Subject to Thermoelastic and Squeeze-Film Damping
CSNDD 2012 - INTERNATIONAL CONFERENCE ON STRUCTURAL NONLINEAR DYNAMICS AND DIAGNOSIS
Autore/i: Belardinelli, Pierpaolo; Brocchini, Maurizio; Demeio, Lucio; Lenci, Stefano
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/107263

The morphological response of beaches protected by different breakwater configurations
Proc. 33rd Int. Conf. Coast. Engng-ASCE
Autore/i: Lorenzoni, Carlo; Postacchini, Matteo; Mancinelli, Alessandro; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/107265

A hydro-morphodynamic model for the nearshore region: Resolution of the exner equation
Proceedings of the International Offshore and Polar Engineering Conference
Autore/i: Postacchini, Matteo; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/174909

An experimental study on sediment transport and bed evolution under different swash zone morphological conditions
COASTAL ENGINEERING
Autore/i: Alsina, J. M.; Cáceres, I.; Brocchini, Maurizio; Baldock, T. E.
Classificazione: 1 Contributo su Rivista
Abstract: In this study, new large‐scale experimental data are presented showing evidences of a link between the swash zone dynamics and the surf zone morphodynamics. Two sets of large-scale experiments are presented. The first set of experiments investigates the swash and surf dynamics under the same hydrodynamic forcing but with two different swash zone morphological conditions, one of which was created by manual reshaping of the sub-aerial beach face. It is shown that more dissipative swash zone conditions (a more mildly sloping beach face) significantly reduce the rate of seaward sandbar migration such that it almost ceases during the performed experimentation time. This behavior is compared to a second set of experiments which shows the natural sand bar offshore migration under almost identical hydrodynamic forcing. The changes in the sandbar migration are investigated in terms of the differences in the swash zone dynamics. The more reflective swash zone is characterized by more intense backwashes that, in turn, promote significant quantities of sediment suspension during the interaction of the backwash with the subsequent bore. The dissipative swash zone leads to a larger number of wave–swash interactions, reducing the backwash magnitudes and the magnitude of suspended sediment concentration events in the swash zone, with a corresponding reduction in the offshore suspended sediment transport. The total offshore sediment transport rates are also shown to reduce, leading to the observed modification of the sandbar migration.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/71108

Experimental rotations of a pendulum on water waves
JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS
Autore/i: Lenci, Stefano; Brocchini, Maurizio; Lorenzoni, Carlo
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/62512

A multi-purpose, intra-wave, shallow water hydro-morphodynamic solver
ADVANCES IN WATER RESOURCES
Autore/i: Postacchini, Matteo; Brocchini, Maurizio; Mancinelli, Alessandro; Landon, Marc
Classificazione: 1 Contributo su Rivista
Abstract: A hydro-morphodynamic numerical model is illustrated as a novel contribution to the investigation and prediction of nearshore and riverine flows and seabed changes forced by waves and currents. The model includes a robust hydrodynamic solver for the integration of the nonlinear shallow water equations (NSWE) and a rather flexible solver for the resolution of the Exner equation (used to evaluate the morphological evolution of the seabed). A detailed analysis is given of existing and novel procedures for the solution of the morphodynamic problem. Coupling of NSWE and Exner equations and updating of the solution is made by means of a sequential splitting scheme. The model has been validated by reproducing both analytical and numerical solutions, available in the recent literature, as well as an in-house laboratory experiment. The simulation of existing theoretical solutions has revealed the model performs well, especially in the prediction of the seabed evolution due to either bed-load or suspended-load transport forced by dam-break and swash-type events. The latter ones are seen to force both erosion and accretion despite the weak hydro-morphodynamic coupling. The comparison between solver results and experimental data is also encouraging, the solver reproducing well the main seabed features forced by irregular waves.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/64717

Vortex generation in rigid-bed and mobile-bed compound channels
ATTI DEL XX CONGRESSO AIMETA DI MECCANICA TEORICA E APPLICATA
Autore/i: Postacchini, Matteo; Brocchini, Maurizio; Mancinelli, Alessandro
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: CD-ROM. In formato cartaceo solo i sommari
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/63790

Experimental investigation of the seabed scouring around a submarine pipeline laying on different types of seabed
Proceedings of "Two-Phase Modelling for Sediment Dynamics In Geophysical Flows" - THESIS-2011
Autore/i: Mattioli, M.; Brocchini, Maurizio; Mancinelli, Alessandro
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/164737

Free surface boundary conditions for spilling waves: theoretical approach and numerical implementation
Atti del XX Congresso AIMETA
Autore/i: Gaeta, M. G.; Brocchini, Maurizio; Lamberti, A.
Editore: Publi&Stampa Edizioni
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The recent advancement of numerical modeling has given valuable insights in the knowledge of wave transformation and interaction with coastal structures. In particular, the twophase flow formulation gives advantages towards a more accurate reproduction of the processes and a deeper understanding of the dynamics developing at wave breaking, where an aerated splashing regime is observed. However, such an approach is found to be computationally expensive, especially in the case of large-scale analyses. Aim of the present paper is to describe a novel single-phase numerical model where the adopted free surface boundary conditions take into account the multiphase mixing layer forming at surface deformation. Preliminary comparisons with available data on hydraulic jumps, stationary counterparts of bores, reveal good performances of the model.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/196705

A novel two-fluid model for the study of multiple solutions of a multiphase flow in hilly terrain pipelines
MFIP12 - 12th International Conference on Multiphase flow in industrial plants
Autore/i: Corvaro, Sara; Terenzi, A.; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: abstract is included in the Conference booklet manuscript is included in the Conference USB pen drive
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/63431

A new analytical model for a stratified two-phase flow in inclined pipeline
ATTI DEL XX CONGRESSO AIMETA DI MECCANICA TEORICA E APPLICATA
Autore/i: Corvaro, Sara; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: CD-ROM in formato cartaceo solo i sommari
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/62565

Comparative analysis of sea wave dissipation induced by three flow mechanisms
JOURNAL OF HYDRAULIC RESEARCH
Autore/i: Postacchini, Matteo; Brocchini, Maurizio; Corvaro, Sara; Lorenzoni, Carlo; Mancinelli, Alessandro
Classificazione: 1 Contributo su Rivista
Abstract: A comparative analysis is performed on the wave energy dissipation efficiency on various coastal protection devices. In-house experimental data on the performance of two innovative coastal defence methods and of traditional submerged breakwaters have been used. The analysis provides a quantitative comparison of the efficiency of wave dissipators based on either wave-breaking turbulence, near-bed turbulence, or inside-seabed turbulence decay. The comparison is made on the basis of wave height decay patterns described as a function of suitable dimensionless parameters. The dimensionless volume of maximum turbulence decay is found to be a useful parameter for the analysis. Efficiencies in reducing the intensity of the incident waves are measured by the wave transmission coefficient, which is found to range between 0.4 and 1.0. Submerged breakwaters were found to be the most efficient wave dissipators, especially for large waves, while comparable efficiencies are provided by the three mechanisms under analysis if the flow is forced by moderate waves.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/57199

Lagrangian mixing in straight compound channels
JOURNAL OF FLUID MECHANICS
Autore/i: Stocchino, A.; Besio, G.; Angiolani, S.; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: Recently Stocchino & Brocchini (J. Fluid Mech., vol. 643, 2010, p. 425 have studied the dynamics of two-dimensional (2D) large-scale vortices with vertical axis evolving in a straight compound channel under quasi-uniform flow conditions. The mixing processes associated with such vortical structures are here analysed through the results of a dedicated experimental campaign. Time-resolved Eulerian surface velocity fields, measured using a 2D particle-image velocimetry system, form the basis for a Lagrangian analysis of the dispersive processes that occur in compound channels when the controlling physical parameters, i.e. the flow depth ratio (rh) and the Froude number (Fr) are changed. Lagrangian mixing is studied by means of various approaches based either on single-particle or multiple-particle statistics (relative and absolute statistics, probability density functions (p.d.f.s) of relative displacements and finite-scale Lyapunov exponents). Absolute statistics reveal that transitional macrovortices, typical of shallow flow conditions, strongly influence the growth in time of the total absolute dispersion, after the initial ballistic regime, leading to a nonmonotonic behaviour. In deep flow conditions, on the contrary, the absolute dispersion displays a monotonic growth because the generation of transitional macrovortices does not take place. In all cases an asymptotic diffusive regime is reached. Multiple-particle dynamics is controlled by rh and Fr. Different growth regimes of the relative diffusivity have been found depending on the flow conditions. This behaviour can be associated with different energy transfer processes and it is further confirmed by the p.d.f.s of relative displacements, which show a different asymptotical shape depending on the separation scales and the Froude number. Finally, an equilibrium regime is observed for all the experiments by analysing the decay of the finite-scale Lyapunov exponents with the particle separations.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/56099

Swash zone response under various wave regimes
JOURNAL OF HYDRAULIC RESEARCH
Autore/i: Vicinanza, D.; Baldock, T.; Contestabile, P.; Alsina, J.; Cáceres, I.; Brocchini, Maurizio; Conley, D.; Andersen, T. L.; Frigaard, P.; Ciavola, P.
Classificazione: 1 Contributo su Rivista
Abstract: The modelling of swash zone (SZ) sediment transport and the resulting morphodynamics have been areas of active research over the last decade. However, many details are still to be understood, whose knowledge will be greatly advanced by the collection of high-quality data under the controlled large-scale laboratory conditions. The research describes tests carried out in the large wave flume of the Maritime Engineering Laboratory at Catalonia University of Technology, to investigate the SZ under the storm conditions. Its main aim was to compare beach-profile responses for monochromatic waves, monochromatic waves plus free long waves, bi-chromatic waves and random waves. Both erosive and accretive conditions were considered. Results discussed here were derived from the analysis of only a part of the whole data set.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/63555

Swash Zone Dynamics due to Impulsive Waves.
JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING-ASCE
Autore/i: Antuono, M.; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: On the basis of the recently proposed boundary value problem for the nonlinear shallow water equations and the extension of its available solutions for swash zone flows, we propose regression curves for the prediction of the maximum runup and the maximum rundown induced by impulsive waves on a frictionless, uniformly sloping beach. This class of input waves is generally used to represent tsunami waves generated by seismic fault dislocations or submarine landslides. Therefore, they have important applications in the coastal engineering practice. Regression formulas are expressed as functions of both the wave height and the wave steepness and are validated through comparison with maximum runup laws and breaking conditions already available in the literature.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/59703

A novel DNS solver for pipe-soil interaction simulations: a stedy current
ATTI DEL XXXII CONVEGNO NAZIONALE DI IDRAULICA E COSTRUZIONI IDRAULICHE
Autore/i: Mattioli, M.; Mancinelli, Alessandro; Colicchio, G.; Brocchini, Maurizio
Editore: Walter Farina Editore
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/58290

Esperimenti in larga scala sull'effetto del raggruppamento delle onde sulla morfodinamica della zona di battigia.
ATTI DEL XXXII CONVEGNO NAZIONALE DI IDRAULICA E COSTRUZIONI IDRAULICHE
Autore/i: Vicinanza, D.; Contestabile, P.; Postacchini, Matteo; Brocchini, Maurizio
Editore: Walter Farina Editore
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/59706

Processi lagrangiani di miscelamento nei compound channels.
ATTI DEL XXXII CONVEGNO NAZIONALE DI IDRAULICA E COSTRUZIONI IDRAULICHE
Autore/i: Angiolani, S.; Stocchino, A.; Besio, G.; Brocchini, Maurizio
Editore: Walter Farina Editore
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/59705

Turbulent characteristics and Lagrangian Coherent Structures (LCS) in uniform Compound Channels
IAHR-RCEM Symposium RCEM 2009
Autore/i: Stocchino, A; Brocchini, Maurizio; Besio, G.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/42489

Some experimental results on the efficiency of different breakwater configuartions
ATTI DEL XXXII CONVEGNO NAZIONALE DI IDRAULICA E COSTRUZIONI IDRAULCIHE
Autore/i: Postacchini, Matteo; Lorenzoni, Carlo; Mancinelli, Alessandro; Brocchini, Maurizio
Editore: Walter Farina Editore
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/58299

Scouring below pipelines: the role of vorticity and turbulence.
Proceedings of the ASME Conference 2010
Autore/i: Mattioli, M.; Colicchio, G.; Brocchini, Maurizio; Mancinelli, Alessandro
Editore: ASME
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/59704

Nearshore bar migration and sediment-induced buoyancy effects
CONTINENTAL SHELF RESEARCH
Autore/i: Falchetti, S; Conley, Dc; Brocchini, Maurizio; Elgar, S.
Editore: Elsevier Science Limited:Oxford Fulfillment Center, PO Box 800, Kidlington Oxford OX5 1DX United Kingdom:011 44 1865 843000, 011 44 1865 843699, EMAIL: asianfo@elsevier.com, tcb@elsevier.co.UK, INTERNET: http://www.elsevier.com, http://www.elsevier.com/locate/shpsa/, Fax: 011 44 1865 843010
Classificazione: 1 Contributo su Rivista
Abstract: A 1-D General Ocean Turbulence Model that includes the effects of sediment-induced stratification is shown to simulate the observed onshore and offshore migration of a nearshore sandbar. The only two free parameters of the model, the bed reference concentration and the sediment diffusivity, are taken from the literature, rather than tuned to the data used here. The model results suggest that predictions of onshore bar migration, in which wave-induced sediment transport confined to within a few centimeters of the bottom dominates, are not greatly affected by accounting for buoyancy effects. The model results also suggest that both mean flows and waves transport sediment during offshore bar migration, with different components of transport dominating at different cross-shore locations across the bar-trough bathymetry. Neglecting the effects of sediment-induced stratification results in higher model skill during the largest waves, likely because the excess turbulence production simulated by the non-stratified model is counterbalanced by neglected breaking-wave-generated turbulence. Considering both onshore and offshore migration, the model that includes sediment-induced stratification has higher skill than the model without stratification.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30992

On the wave damping due to a permeable seabed
COASTAL ENGINEERING
Autore/i: Corvaro, Sara; Mancinelli, Alessandro; Brocchini, Maurizio; Seta, E; Lorenzoni, Carlo
Classificazione: 1 Contributo su Rivista
Abstract: Laboratory experiments were performed to study the wave damping induced by a porous bed. During the propagation of waves over a porous medium the wave characteristics change: a significant wave height attenuation of about 20–30% is observed and, in almost all cases, an increase in wavelength. The wave decay is found to depend on the wave characteristics like the wave height, the wavelength and the wave shape. We have also studied the influence of the geometric properties of the porous bed (i.e. thickness and length) on the wave dissipation. It is found that the attenuation of the wave height increases with the permeable bed thickness and that there is a maximum wave dissipation for a length of the porous seabed equal to 2.0–2.5 times the wavelength. A comparison is also made of our findings with available literature results. A parametric study of the wave damping has been performed by varying the values of the resistance coefficients derived by both literature and experiments. Literature analytical models have been applied by using the resistance coefficients that better describe our flow conditions. All models in use underpredict the observed wave attenuation for any sensible values of the resistance coefficients.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/37014

Analysis of the Nonlinear Shallow Water Equations over non-planar topography.
STUDIES IN APPLIED MATHEMATICS
Autore/i: Antuono, M; Brocchini, Maurizio
Editore: Blackwell Publishing Limited:9600 Garsington Road, Oxford OX4 2DQ United Kingdom:011 44 1865 776868 , (781)388-8200, EMAIL: agentservices@oxon.blackwellpublishing.com, e-help@blackwellpublishers.co.uk, INTERNET: http://www.blackwellpublishing.com, Fax: 011 44 1865 714591
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30989

Dispersive Nonlinear Shallow Water Equations: some preliminary numerical results
JOURNAL OF ENGINEERING MATHEMATICS
Autore/i: Grosso, G; Antuono, M; Brocchini, Maurizio
Editore: Dordrecht Netherlands: Kluwer Academic Publishers Dordrecht ; Groningen ; Alphen aan den Rijn : [s.n.] : Sijthoff & Noordhoff : Nijhoff
Classificazione: 1 Contributo su Rivista
Abstract: The dispersive nonlinear shallow-water equations of Antuono et al. (Stud Appl Math 122:1–28, 2008) are solved by means of an explicit arbitrary high-order accurate finite-volume scheme for nonlinear hyperbolic systems with stiff source terms. Tests against typical benchmark solutions are used to illustrate the robustness and accuracy of the solver while typical solutions for the propagation of solitary waves on a slope highlight the solution value in reproducing nearshore flows.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31052

Horizontal mixing of quasi-uniform, straight, compound channel flows
JOURNAL OF FLUID MECHANICS
Autore/i: Stocchino, A; Brocchini, Maurizio
Editore: Cambridge University Press / New York:40 West 20th Street:New York, NY 10011:(800)872-7423, (212)924-3900, EMAIL: journals_subscriptions@cup.org, INTERNET: http://www.journals.cambridge.org, Fax: (212)691-3239
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30991

A study of violent sloshing wave impacts using an improved SPH method
JOURNAL OF HYDRAULIC RESEARCH
Autore/i: Colagrossi, A; Colicchio, G; Lugni, C; Brocchini, Maurizio
Editore: International Association for Hydraulic Research:PO Bajo Virgen del Puerto 3, 28005 Madrid Spain:011 34 91 3557908, EMAIL: iahr@iahr.org, INTERNET: http://www.iahr.org, Fax: 011 31 91 3357935
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31051

Evolution of the air-cavity during a depressurized Wave Impact. Part I: the kinematical flow field
PHYSICS OF FLUIDS
Autore/i: Lugni, C; Miozzi, M; Brocchini, Maurizio; Faltinsen, Om
Editore: American Institute of Physics:2 Huntington Quadrangle, Suite 1NO1:Melville, NY 11747:(800)344-6902, (631)576-2287, EMAIL: subs@aip.org, INTERNET: http://www.aip.org, Fax: (516)349-9704
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31053

Solving the Nonlinear Shallow Water Equations in physical space.
JOURNAL OF FLUID MECHANICS
Autore/i: Antuono, M; Brocchini, Maurizio
Editore: Cambridge University Press / New York:40 West 20th Street:New York, NY 10011:(800)872-7423, (212)924-3900, EMAIL: journals_subscriptions@cup.org, INTERNET: http://www.journals.cambridge.org, Fax: (212)691-3239
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30990

Evolution of the air-cavity during a depressurized Wave Impact. Part II: the dynamical field
PHYSICS OF FLUIDS
Autore/i: Lugni, C; Brocchini, Maurizio; Faltinsen, Om
Editore: American Institute of Physics:2 Huntington Quadrangle, Suite 1NO1:Melville, NY 11747:(800)344-6902, (631)576-2287, EMAIL: subs@aip.org, INTERNET: http://www.aip.org, Fax: (516)349-9704
Classificazione: 1 Contributo su Rivista
Abstract: The present paper on wave-impact events in depressurized environments completes the analysis of Part I by focusing on the dynamical features of the impacts and on the influence of the ambient pressure. Connection is made between the impact regimes typically described in the literature and the stages described in Part I C. Lugni, M. Miozzi, M. Brocchini, and O. M. Faltinsen, “Evolution of the air cavity during a depressurized wave impact. I. The kinematic flow field,” Phys. Fluids 22, 056101 2010. The stages of isotropic/anisotropic compression and expansion of the air cavity are of particular interest. The impact duration at the wall is almost independent of its height above the undisturbed surface level, but its intensity rapidly decreases in the body of the fluid the peak pressure halves within the first two compression/expansion cycles. The time evolution of the pressure loads on the wall is analyzed by means of the Hilbert transform and an empirical mode decomposition of the signals. This enables identification of the intrinsic mode functions which best fit the original signal during its evolution and quantification of the frequency downshifting which characterize the whole process. The pressure decay, largely governed by air leakage out of the cavity, is found to be very intense during the air cavity closure and the isotropic compression/ expansion cycle stages 1 and 2; the decay observed during stage 3, i.e., during the anisotropic compression/expansion cycles, is weaker and independent of the vertical location down the wall. Differences between the observed decay rates and those of a three-dimensional bubble in an infinite fluid are mainly due to the bubble being two-dimensional, being close to the free surface and loosing air. The role of both ullage and vapor pressures on the impact is described, respectively, by means of the Euler and cavitation numbers. The frequency of the bubble oscillation depends on these numbers in a way that is closely similar to that displayed by the bubble area
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31054

Working of defence coastal structures dissipating by macro-roughness
JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING-ASCE
Autore/i: Lorenzoni, Carlo; Soldini, Luciano; Brocchini, Maurizio; Mancinelli, Alessandro; Postacchini, Matteo; Seta, E; Corvaro, Sara
Editore: American Society of Civil Engineers / ASCE:1801 Alexander Bell Drive, # A776:Reston, VA 20191:(800)548-2723, (703)295-6210, EMAIL: marketing@asce.org, INTERNET: http://www.pubs.asce.org, Fax: (703)295-6211
Classificazione: 1 Contributo su Rivista
Abstract: The working features of innovative coastal defense structures that can dissipate the energy of incoming waves by the action of large-scale bottom unevennesses rigid blades covering the lower half of the water depth were investigated by means of a laboratory experimental campaign. The goal of the study was to characterize the ability of the structures to efficiently reduce the wave height with a minimal change in the mean water superelevations. Similar wave height reductions were achieved for both vertical and inclined blades; their efficiency was slightly superior to that of traditional submerged rubble-mound breakwaters of the same cross-shore extension. For the incident waves examined, very low mean water elevations were observed inshore of the structures, with the inclined blades producing the smallest values. These results suggest that the structures analyzed here could represent an alternative to submerged rubble-mound breakwaters from a hydrodynamic point of view to protect coastlines prone to erosion with minimal risk of dangerous rip currents.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50310

Evolution of the air-cavity during a wave impact
XIX Congresso Nazionale A.I.M.E.T.A.
Autore/i: C., Lugni; M., Miozzi; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: CD-ROM, Paper N. 113, 10 pages
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43241

An experimental analysis of the hydronamics of submerged structures dissipating by macro-roughness
Proceedings of the 2nd International Conference on the Application of Physical Modelling to Port and Coastal Protection - COASTLAB 08
Autore/i: Lorenzoni, Carlo; Brocchini, Maurizio; Mancinelli, Alessandro; Soldini, Luciano; E., Seta; Postacchini, Matteo
Editore: IAHR
Luogo di pubblicazione: MADRID
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52314

Some experimental studies on the sea wave disspation over different seabeds
AIMETA 2009 Atti del XIX Congresso dell'Associazione Italiana di Meccanica Teorica e Applicata
Autore/i: Corvaro, Sara; Lorenzoni, Carlo; Postacchini, Matteo; Seta, E; Soldini, Luciano; Brocchini, Maurizio; Mancinelli, Alessandro
Editore: Aras Edizioni
Luogo di pubblicazione: ANCONA
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51350

Some experimental studies on the sea wave dissipation over different seabeds
Atti del XIX Congresso dell'Associazione di Meccanica Teorica e Applicata
Autore/i: Corvaro, Sara; Lorenzoni, Carlo; Postacchini, Matteo; Seta, E.; Soldini, Luciano; Brocchini, Maurizio; Mancinelli, Alessandro
Editore: Aras Edizioni
Luogo di pubblicazione: Ancona
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: CD_ROM, FL-02, Paper n.117
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/65951

Mitigating the impact on the nearshore hydro-morphodynamics of macrovortices generated at submerged breakwaters
Coastal Structures 2007 Proc. of the 5th Int. Conf.
Autore/i: Soldini, Luciano; Lorenzoni, Carlo; Mancinelli, Alessandro; Brocchini, Maurizio
Editore: World Scientific
Luogo di pubblicazione: SINGAPORE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/42927

Mitigating the impact on the nearshore hydro-dynamics of macrovortices generated at submerged breakwaters
Proceedings of the 5th Coastal Structures International Conference - Coastal Structures 2007
Autore/i: L., Soldini; Lorenzoni, Carlo; Mancinelli, Alessandro; Brocchini, Maurizio
Editore: World Scientific
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/47629

Numerical investigation of scouring around pipelines
Proceedings of the 12th Numerical Towing Tank Symposium (NUTTS) CD-ROM
Autore/i: Colicchio, G; Mattioli, M; Lugni, C; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/42310

Interazione di onde con fondale poroso
AIMETA 2009 Atti del XIX Congresso dell'Associazione Italiana di Meccanica Teorica e Applicata
Autore/i: Corvaro, Sara; Lorenzoni, Carlo; Seta, E.; Mancinelli, Alessandro; Brocchini, Maurizio
Editore: Aras Edizioni
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51347

The early stages of shallow flows in an inclined flume.
JOURNAL OF FLUID MECHANICS
Autore/i: Antuono, M; Hogg, A. J.; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: The motion of an initially quiescent shallow layer of fluid within an impulsively tilted flume is modelled using the nonlinear shallow water equations. Analytical solutions for the two-dimensional flow are constructed using the method of characteristics and, in regions where neither of the characteristic variables is constant, by adopting hodograph variables and using the Riemann construction for the solution. These solutions reveal that the motion is strongly influenced by the impermeable endwalls of the flume. They show that discontinuous solutions emerge after some period following the initiation of the flow and that for sufficiently long flumes there is a moving interface between wetted and dry regions. Using the hodograph variables we are able to track the evolution of the flow analytically. After the discontinuities develop, we also calculate the velocity and height fields by using jump conditions to express conservation of mass and momentum across the shock and thus we show how the hydraulic jump moves within the domain and how its magnitude grows. In addition to providing the behaviour of the flow in this physical scenario, this unsteady solution also provides an important test case for numerical algorithms designed to integrate the shallow water equations.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30988

Dispersive Nonlinear Shallow Water Equations
STUDIES IN APPLIED MATHEMATICS
Autore/i: Antuono, M; Liapidevskii, V; Brocchini, Maurizio
Editore: Blackwell Publishing Limited:9600 Garsington Road, Oxford OX4 2DQ United Kingdom:011 44 1865 776868 , (781)388-8200, EMAIL: agentservices@oxon.blackwellpublishing.com, e-help@blackwellpublishers.co.uk, INTERNET: http://www.blackwellpublishing.com, Fax: 011 44 1865 714591
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30986

Modeling of the wave setup inshore of an array of submerged breakwaters
JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING-ASCE
Autore/i: Soldini, Luciano; Lorenzoni, Carlo; Brocchini, Maurizio; Mancinelli, Alessandro; Cappietti, L.
Classificazione: 1 Contributo su Rivista
Abstract: A comparative assessment of available formulae for the water setup inshore of submerged breakwaters is made on the basis of a wide and varied dataset derived from basin and flume laboratory experiments. Formulae derived from a simplified view which does not account for the horizontal flow circulation provide a large overestimate _up to one order of magnitude_ of the smaller setup values. A much better overall approximation of the measured data is obtained through formulae that consider the setup as part of a complete flow description, be it partially or fully accounting for the horizontal flow motion.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51260

Describing vortical nearshore flows by means of a dissipative Point Vortex model
Proc. 31st I.C.C.E.
Autore/i: E., Terrile; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43240

L'influenza del profilo di spiaggia sul rischio di allagamento da onde di regioni costiere: un'analisi preliminare
IDRA08 - 31° convegno nazionale di idraulica e costruzioni idrauliche
Autore/i: Soldini, Luciano; Mancinelli, Alessandro; Lorenzoni, Carlo; Brocchini, Maurizio
Editore: Morlacchi editore
Luogo di pubblicazione: PERUGIA
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Atti del 31° convegno nazionale di idraulica e costruzioni idrauliche, CD-ROM allegato, memoria 329.pdf
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53745

Coherent flow structures, horizontal mixing and dispersion measured at the surface of shallow compound channel flows
Proc. RiverFlow'08
Autore/i: A. C., Rummel; S., Sartini; A., Stocchino; A., Piattella; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43238

A Lagrangian algorithm for multiphase free-surface flow
14th Int. Symp. on Appl. of Laser Techn. to Fluid Mech
Autore/i: M., Miozzi; C., Lugni; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: CD-ROM, Paper N. 4.3-3, 12 pp
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/42308

Morphodynamics shoreline boundary conditions: preliminary validation at prototype scale
Proc. 31st I.C.C.E.
Autore/i: S., Falchetti; Brocchini, Maurizio; D. C., Conley
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/42307

Nonlinear shallow water equations modeling for coastal engineering
JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING-ASCE
Autore/i: Brocchini, Maurizio; M, Dodd
Editore: American Society of Civil Engineers / ASCE:1801 Alexander Bell Drive, # A776:Reston, VA 20191:(800)548-2723, (703)295-6210, EMAIL: marketing@asce.org, INTERNET: http://www.pubs.asce.org, Fax: (703)295-6211
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30776

The effects of flow stratification by noncohesive sediment on transport in high energy unsteady flows
JOURNAL OF FLUID MECHANICS
Autore/i: Conley, D. C.; Falchetti, S; Lohmann, I; Brocchini, Maurizio
Editore: Cambridge University Press / New York:40 West 20th Street:New York, NY 10011:(800)872-7423, (212)924-3900, EMAIL: journals_subscriptions@cup.org, INTERNET: http://www.journals.cambridge.org, Fax: (212)691-3239
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30985

Maximum run-up, breaking conditions and dynamical forces in the swash zone: a Boundary Value approach
COASTAL ENGINEERING
Autore/i: Antuono, M; Brocchini, Maurizio
Editore: Elsevier BV:PO Box 211, 1000 AE Amsterdam Netherlands:011 31 20 4853757, 011 31 20 4853642, 011 31 20 4853641, EMAIL: nlinfo-f@elsevier.nl, INTERNET: http://www.elsevier.nl, Fax: 011 31 20 4853598
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30984

The morphodynamics of tidal sand waves: a model overview
COASTAL ENGINEERING
Autore/i: Besio, G; Blondeaux, P; Brocchini, Maurizio; Hulscher, S. J. M. H.; Idier, D; Knaapen, M. A. F.; Nemeth, A. A.; Roos, P. C.; Vittori, G.
Editore: Elsevier BV:PO Box 211, 1000 AE Amsterdam Netherlands:011 31 20 4853757, 011 31 20 4853642, 011 31 20 4853641, EMAIL: nlinfo-f@elsevier.nl, INTERNET: http://www.elsevier.nl, Fax: 011 31 20 4853598
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30982

Use of numerical models to study land-based sedimentation and subsequent nearshore morphological evolution
COASTAL ENGINEERING
Autore/i: Dodd, N; Stoker, A. M.; Garnier, R; Vittori, G; DE LOS SANTOS, F; Brocchini, Maurizio; Soldini, Luciano; Losada, M. A.
Classificazione: 1 Contributo su Rivista
Abstract: A beach sedimentation problem is presented. This problem involves assessing the impact and importance of land-based sediment sources (erosion from gullies during intense rainfall, and directly from cliffs by wave action) on morphodynamic changes at a beach. The site motivating the study is La Barrosa beach, Spain. The location is described and a discussion of possible approaches presented. A schematized representation of a gully and beach is used. A hybrid approach is adopted, in which sediment deposition by run-off (and to a lesser extent cliff erosion) is modelled using wave-resolving hydrodynamic models. It is found that significant amounts of sediment can be supplied by gully run-off during storms. For small run-offs the swash can be involved in determining the region of deposition within the gully area, with longer period motions favouring increased sediment deposition at gully sides. Simulations also show that swash motions can erode gully sides, and the presence of a cross-shore jet associated with the swash and gullies can also impact on sediment movement. Longer term, wave-averaged morphodynamic modelling (without a swash zone) indicates that run-off deposits subsequently diffuse laterally, whether under normal or oblique incidence. These simulations also reveal the possibility of underlying crescentic bar-shedding dynamics that may pertain during changes of wave conditions.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30494

Dispersive effects on wave-current interaction and vorticity transport in nearshore flows
PHYSICS OF FLUIDS
Autore/i: Terrile, E; Brocchini, Maurizio; Christensen, K. H.; Kirby, J. T.
Editore: American Institute of Physics:2 Huntington Quadrangle, Suite 1NO1:Melville, NY 11747:(800)344-6902, (631)576-2287, EMAIL: subs@aip.org, INTERNET: http://www.aip.org, Fax: (516)349-9704
Classificazione: 1 Contributo su Rivista
Abstract: Frequency dispersive effects on the interaction of waves and currents in a nearshore circulation system are analyzed. By means of both analytical and numerical calculations, we find that dispersive effects are important in the description of the correct amount of the wave forcing, represented, within the generalized-Lagrangian-mean-like approach, by the pseudomomentum p. They are particularly important when describing the flow using depth-averaged velocities. For some configurations, the depth-averaged current is forced not only by the nondispersive terms but also, with the same intensity, by the dispersive forcing terms. In such terms is included a vortex-force dispersive contribution, usually negligible in a small-wave amplitude approximation, which arises because of the presence of dissipative terms.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30778

The mean and turbulent flow structure of a weak hydraulic jump.
PHYSICS OF FLUIDS
Autore/i: Misra, S. K.; Kirby, J. T; Brocchini, Maurizio; Veron, F; Thomas, M; Kambhamettu, C.
Editore: American Institute of Physics:2 Huntington Quadrangle, Suite 1NO1:Melville, NY 11747:(800)344-6902, (631)576-2287, EMAIL: subs@aip.org, INTERNET: http://www.aip.org, Fax: (516)349-9704
Classificazione: 1 Contributo su Rivista
Abstract: The turbulent air–water interface and flow structure of a weak, turbulent hydraulic jump are analyzed in detail using particle image velocimetry measurements. The study is motivated by the need to understand the detailed dynamics of turbulence generated in steady spilling breakers and the relative importance of the reverse-flow and breaker shear layer regions with attention to their topology, mean flow, and turbulence structure. The intermittency factor derived from turbulent fluctuations of the air–water interface in the breaker region is found to fit theoretical distributions of turbulent interfaces well. A conditional averaging technique is used to calculate ensemble-averaged properties of the flow. The computed mean velocity field accurately satisfies mass conservation. A thin, curved shear layer oriented parallel to the surface is responsible for most of the turbulence production with the turbulence intensity decaying rapidly away from the toe of the breaker location of largest surface curvature with both increasing depth and downstream distance. The reverse-flow region, localized about the ensemble-averaged free surface, is characterized by a weak downslope mean flow and entrainment of water from below. The Reynolds shear stress is negative in the breaker shear layer, which shows that momentum diffuses upward into the shear layer from the flow underneath, and it is positive just below the mean surface indicating a downward flux of momentum from the reverse-flow region into the shear layer. The turbulence structure of the breaker shear layer resembles that of a mixing layer originating from the toe of the breaker, and the streamwise variations of the length scale and growth rate are found to be in good agreement with observed values in typical mixing layers. All evidence suggests that breaking is driven by a surface-parallel adverse pressure gradient and a streamwise flow deceleration at the toe of the breaker. Both effects force the shear layer to thicken rapidly, thereby inducing a sharp free surface curvature change at the toe
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30777

Recent advances in modeling swash zone dynamics: the influence of surf-swash interaction on nearshore hydrodynamics and morphodynamics
REVIEWS OF GEOPHYSICS
Autore/i: Brocchini, Maurizio; Baldock, T.
Classificazione: 1 Contributo su Rivista
Abstract: The role of the swash zone in influencing the whole nearshore dynamics is reviewed with a focus on the interaction between surf and swash zone processes. Local and global hydromorphodynamic phenomena are discussed in detail, and a description of the overall swash zone operation is given. The effects of swash zone boundary conditions are highlighted, together with the importance of surf zone boundary conditions. Major emphasis is placed on illustrating the interactions of various hydrodynamic modes which, in turn, control the swash and surf zone morphology. Finally, methods to account for swash zone processes in coastal models with different temporal and spatial resolutions are proposed.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30983

Pipe-soil interaction: an evaluation of numerical models
Proc. OMAE'07
Autore/i: G., Colicchio; A., Colagrossi; Brocchini, Maurizio; M., Venturi; M., Drago
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: CD-ROM, Paper N. 29191, 6 pages
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/44127

Sediment transport and underwater bar migration
5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics
Autore/i: S., Falchetti; Brocchini, Maurizio; D. C., Conley
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/44132

Mathematical modeling of mixing and dispersion effects in the shallow waters of the coastal zone
Geophys. Res. Abstracts
Autore/i: H., Branger; Brocchini, Maurizio; R., Grimshaw; E., Pelinovsky; Yu, Shokin; L., Chubarov; V., Liapidevskii
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: SRef-ID: 1607-7962/gra/EGU2007-A-01697
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/44134

Un'analisi preliminare sul funzionamento di strutture di difesa costiere dissipanti per macroscabrezza
Atti del XVIII Congresso AIMETA di Meccanica teorica ed applicata - CD-ROM allegato, FL12-3
Autore/i: Brocchini, Maurizio; Lorenzoni, Carlo; Mancinelli, Alessandro; Soldini, Luciano
Editore: Starrylink editrice
Luogo di pubblicazione: BRESCIA
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: pubblicato in versione integrale esclusivamente in formato elettronico, CD-ROM FL12-3; 12 pp.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53790

The role of the air-entrapment in the flip-through evolution
Proc. Int. Conf. on Violent Flows (VF-2007)
Autore/i: C., Lugni; M., Miozzi; Brocchini, Maurizio; O. M., Faltinsen
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: CD-ROM, Session 7B, 9 pages
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43237

Data assimilation and modeling of sediment stratification for seabed morphology
Proc. Coastal Sediments '07
Autore/i: S., Falchetti; D. C., Conley; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/44124

Surface-PTV/PIV measurements on shallow compound channel flows: coherent flow structures, horizontal mixing and dispersion
Proc. HMEM'07
Autore/i: A. C., Rummel; S., Sartini; A., Stocchino; A., Piattella; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/44126

Mitiganting the impact on the nearshore hydro-morphodynamics of macrovortices generated at submerged breakwaters
Proc. Costal Structures 2007 Conference
Autore/i: Soldini, L; Lorenzoni, Carlo; Mancinelli, Alessandro; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: in stampa
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51655

Challenges on the numerical investigation of the flip-through
Proc. 9th Int. Conf. on Num. Ship Hydrodyn
Autore/i: G., Colicchio; A., Colagrossi; C., Lugni; U. P., Bulgarelli; Brocchini, Maurizio; O. M., Faltinsen
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: CD-ROM
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/44131

Integral flow properties of the swash zone and averaging. Part 3. The longshore flow.
JOURNAL OF FLUID MECHANICS
Autore/i: Antuono, M; Brocchini, Maurizio; Grosso, G.
Editore: Cambridge University Press / New York:40 West 20th Street:New York, NY 10011:(800)872-7423, (212)924-3900, EMAIL: journals_subscriptions@cup.org, INTERNET: http://www.journals.cambridge.org, Fax: (212)691-3239
Classificazione: 1 Contributo su Rivista
Abstract: The aim of the present work, final of a three-part series, is to analyse in detail flow motions within the swash zone and define suitable shoreline boundary conditions for the longshore flow for wave-averaged circulation models. The analyses of Parts 1 and 2 are extended to cover horizontally two-dimensional flows. An analytical solution for the longshore motion representing the drift velocity of the whole swash zone water mass is found. This is seen to be approximated well by the ratio between the time integral of the longshore momentum flux crossing the swash lower boundary and the swash zone net water volume. Further, a complete set of shoreline boundary conditions, taking into account wave–wave interactions, is obtained on the basis of fully numerical solutions of the nonlinear shallow-water equations. The main focus of the work is to clarify the structure of the shoreline boundary conditions for the longshore flow, but attention has also been paid to their derivation and assessment from the numerical solutions. The latter have been obtained on the basis of a fairly broad range of input wave conditions which, though biased towards those typical of reflective beaches, are believed to cover conditions also typical of moderate dissipative beaches. Two main terms are found to contribute to the longshore drift velocity: (i) a term, proportional to the shallow-water velocity, accounting for short-wave interactions, frictional swash zone forces and continuous forcing due to non-breaking wave nonlinearities and (ii) a drift-type term representing the momentum transfer due to wave breaking.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30773

The Boundary Value Problem for the Nonlinear Shallow Waters Equations
STUDIES IN APPLIED MATHEMATICS
Autore/i: Antuono, M; Brocchini, Maurizio
Editore: Blackwell Publishing Limited:9600 Garsington Road, Oxford OX4 2DQ United Kingdom:011 44 1865 776868 , (781)388-8200, EMAIL: agentservices@oxon.blackwellpublishing.com, e-help@blackwellpublishers.co.uk, INTERNET: http://www.blackwellpublishing.com, Fax: 011 44 1865 714591
Classificazione: 1 Contributo su Rivista
Abstract: We propose an approximate analytical solution of the boundary value problem (BVP) for the nonlinear shallowwaters equations. Ourwork, based on the Carrier and Greenspan [1] hodograph transformation, focuses on the propagation of nonlinear nonbreaking waves over a uniformly plane beach. Available results are briefly discussed with specific emphasis on the comparison between the Initial Value Problem and the BVP; the latter more completely representing the physical phenomenon of wave propagation on a beach. The solution of the BVP is achieved through a perturbation approach solely using the assumption of small waves incoming at the seaward boundary of the domain. The most significant results, i.e., the shoreline position estimation, the actual wave height and velocity at the seaward boundary, the reflected wave height and velocity at the seaward boundary are given for three specific input waves and compared with available solutions.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30774

The influence of the nearshore bathymetry on the evolution of breaking wave-induced macrovortices
Proceedings of the 30th International Conference Coastal Engineering 2006
Autore/i: Soldini, Luciano; Lorenzoni, Carlo; Brocchini, Maurizio; Kennedy, A. B.
Editore: World Scientific
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52212

A dissipative point-vortex model for nearshore circulation
JOURNAL OF FLUID MECHANICS
Autore/i: Terrile, E; Brocchini, Maurizio
Editore: Cambridge University Press / New York:40 West 20th Street:New York, NY 10011:(800)872-7423, (212)924-3900, EMAIL: journals_subscriptions@cup.org, INTERNET: http://www.journals.cambridge.org, Fax: (212)691-3239
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/30775

Integral properties of the swash zone and averaging: the longshore flow
Atti del XXX Convegno di Idraulica e Costruzioni Idrauliche
Autore/i: M., Antuono; Brocchini, Maurizio; G., Grosso
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: CD-ROM, Paper N. 42, 7pp
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/43879

Swash zone boundary conditions: the longshore flow
Proc. 30th I.C.C.E.
Autore/i: M., Antuono; G., Grosso; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/44128