Résumé
The aim of this work is to model the generation and propagation of surface waves as a consequence of submarine landslides. The numerical approach presented in this paper allows for the simulation of both underwater granular flows at the grain scale and free surface wave propagation. The discrete element method (DEM), extensively used for dry granular avalanches, is coupled with the Lattice Boltzmann Method (LBM) for the integration of Navier-Stokes equations. The fluid-grain coupling is introduced at the grain scale by imposing the no-slip condition for the fluid at the grain surface and by integrating at each time step the resulting hydrodynamic forces exerted by the fluid on each grain. The so-called " mass tracking method " is used to introduce a free surface in the model