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Simulating rapid sediment scour by water flow with SPH

pubblicazioni - Articolo

Simulating rapid sediment scour by water flow with SPH

Agate Giordano*, Roberto Guandalini*, Andrea Maffio*, Sauro Manenti**, Antonio Di Monaco**, Stefano Sibilla**, Mario Gallati** 4th SPHERIC Workshop Nantes (Francia), 27-29 Maggio 2009 * ERSE SPA ** UNIVERSITÀ DI PAVIA The present paper deals with the SPH numerical modelling of the interaction between fluid and non-cohesive bed sediments whose scour is induced by a rapid water outflow from the bottom of an experimental reservoir. The dynamic behaviour of the liquid and granular phases is simulated following two alternative approaches: by treating them as slightly compressible fluids whose motion results from the numerical solution of the continuity and momentum equations according to the standard SPH formulation; by describing the evolution of the interface between the two phases (i.e. the erosion process) as a transport diffusion phenomenon. The main features of the model are presented first and then the numerical results for representative experimental test cases are discussed and compared with available experimental data.

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