Collapse of Wet Granular Column under Gravity

Abstract

We numerically investigate the stability of a cylindrical column composed of wet granular materials under gravity using the discrete element method. When the column height exceeds a critical value H_c, the column collapses under its own weight. From the phase diagram for stability, we demonstrate that the critical height depends on the surface tension γ. Applying the Mohr-Coulomb yield criterion, we theoretically determine the critical height H_c, which is subsequently validated through numerical simulations.