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 modeling 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 meshless 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 modeling 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.
Smoothed particle hydrodynamics method for simulating sediment scouring
MANENTI, SAURO;GALLATI, MARIO;SIBILLA, STEFANO
2010-01-01
Abstract
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 modeling 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 meshless 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 modeling 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
