A comprehensive parametric study of LBM-DEM for immersed granular flows

Abstract This paper presents a parametric study of a fluid-particle model which couples Lattice Boltzmann Method (LBM) and Discrete Element Method (DEM) using an immersed moving boundary technique. Benchmark cases with increasing complexity are simulated to understand the numerical accuracy, stability and efficiency of the algorithm. A guideline for a high-quality LBM-DEM model is proposed and applied to a test case of granular collapse in water. The simulation result shows excellent agreement with a companion experiment, which demonstrates the capability of LBM-DEM to describe the dynamics of densely packed and friction dominant immersed granular flows, highlighting its potential to study geophysical mass movements.

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