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Prediction of Sediment Scouring through SPH

pubblicazioni - Articolo

Prediction of Sediment Scouring through SPH

In questo articolo sono presentati gli ultimi sviluppi introdotti nell’approccio con il metodo SPH (Smoothed Particle Hydrodynamics) nella modellazione dei fenomeni di erosione localizzata di sedimenti non coesivi (scouring), indotti da flussi di acqua a superficie libera. In particolare sono stati applicati due criteri per la definizione del meccanismo di rottura e dell’incipiente moto del sedimento di fondo sotto l¿azione idrodinamica di taglio.

This work presents the advances in modelling scouring phenomena of non-cohesive sediments induced by free-surface water flows through the SPH approach; in particular this paper is focused on the selection of the strength criterion for defining the failure mechanism and the incipient motion of the bottom sediments under hydrodynamic friction. Two approaches have been analyzed: one is derived from the Mohr-Coulomb yield criterion, in which some improvements have been realized to include the effect of the fluid properties; the other is based on the more classic Shields approach [11]. A preliminary sensitivity analysis has been carried out in order to provide qualitative assessment of the influence of the model parameters on the erosion process; subsequently an experimental test case has been simulated for evaluating the accuracy provided by both yielding criteria.

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