Saturated sand column in air: comparison between MPM and coupled DEM-LBM

Many hazardous natural phenomena like debris flow, avalanches and submerged landslides are governed by the interactions between solid grains and interstitial fluid, and they are still very challenging to simulate numerically. This paper considers a small-scale column collapse experiment, and compares the results of two different numerical approaches: (i) a continuum, two-phase Material Point Method (MPM) and (ii) a Discrete Element Method coupled with the Lattice Boltzmann Method (DEM-LBM). Differences and similarities of the methods are highlighted in order to give an insight into the modelling of saturated granular flows