We simulate here the collapse of granular columns immersed in a viscous fluid based on a simplified version of the model developed by F. Bouchut, E.D. Fernández-Nieto, A. Mangeney, G. Narbona-Reina, A two-phase two-layer model for fluidized granular flows with dilatancy effects. J. Fluid Mech, 801, 166-221 (2016). The simulation quite well reproduces the dynamics and deposit of the granular mass as well as the excess pore fluid pressure measured in the laboratory experiments of L. Rondon, O. Pouliquen and P. Aussillous, Granular collapse in a fluid: Role of the initial volume fraction, Physics of Fluids, 23, 073301 (2011) owing that dilatancy effects and pore pressure feedback are accounted for. In particular, the difference in the behaviour of initially loose and dense columns is reproduced numerically.

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