A fluidised and stable non-isochoric model applied to the numerical simulation of the collapse of dense granular columns
Résumé
This work investigates the numerical time discretization of a new stable non-isochoric granular model. The objective is on finding an efficient numerical scheme. The granular material, which is a mixture of solid particles and air, is treated as a continuum. For the present study, viscous Drucker-Prager rheology is used in the momentum equation to model solid particle friction. An expansion law, which depends on pressure, volume fraction and deformation rate, and describes the local volume change, completes the system so that the resulting model is linearly stable and decreasing in energy. Preliminary results of numerical simulations of the collapse of dense granular columns will be presented and comparison with experimental results discussed.
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