Abstract
We proposed a direct numerical simulation model of seepage flow and granular soils by combining the lattice Boltzmann method and the discrete element method. Multiple Relaxation Time (MRT) model was introduced in order to obtain stable solutions of the fluid flow under high Reynolds number condition. Partially Saturated (PS) model, which retain a local operation at each fluid node and keep from intensive increasing the computational costs for the calculation of collision term, was also introduced as a solid-fluid coupled model. We show the effectiveness of the PS-MRT lattice Boltzmann model through several validation tests.
