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Smoothed Particle Hydrodynamics Method for Simulating Sediment

pubblicazioni - Articolo

Smoothed Particle Hydrodynamics Method for Simulating Sediment

L’erosione dei sedimenti indotta dal flusso d’acqua a superficie libera rappresenta un argomento di grande interesse in molti campi dell’ingegneria applicata, inerenti ad esempio le manovre di apertura degli scarichi di fondo in un bacino artificiale e la progettazione e la manutenzione di strutture parzialmente sommerse. La metodologia SPH si è rivelata un approccio numerico valido per la simulazione di questo tipo di problemi. In particolare, in quest’articolo, sono stati analizzati due criteri per la definizione del meccanismo di rottura e dell¿incipiente moto del sedimento di fondo, illustrando la formulazione teorica e i risultati numerici.

Sediment scouring due to free-surface water flows represents a topic of great concern in several fields of the applied engineering such as operation of an artificial reservoir, design and maintenance of partially submerged structures. Even if traditional CFD techniques are commonly adopted for modelling such problems, they suffer from some intrinsic limitations owing to the difficulty to mimic surface separation and wave breaking; furthermore, high computational effort is generally needed for simulating moving boundaries and interfaces that often require cumbersome adaptive mesh rezoning to avoid numerical degradation related to large deformation induced mesh distortion. Due to its peculiar features of mesh less method, Smoothed Particle Hydrodynamics (SPH) handles easily those problems and gives the chance for setting up a reliable tool that can predict the relevant engineering aspects of the water-sediment coupled dynamics in presence of rapidly varied free-surface flows. In this work, recent implementations in modelling of non-cohesive sediment scouring by SPH are illustrated: two different approaches to the problem are discussed, showing the basics of the theoretical formulation and numerical results for some test case of interest.

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