Drag force on a disk-shaped rotor rotating in a granular medium

摘要: Abstract This paper presents a numerical investigation of disk-shaped rotor rotating inside granular medium using the discrete element method, and torque, quantitatively characterizing resultant drag forces on from surrounding particles, is mainly explored. The existence dumbbell-shaped region induced by may essentially give rise to steady state independent initial loading conditions, in which pressure difference between upper lower surfaces disk disappears torque always tends stationary value. Furthermore, rotation induces an anisotropic structure with formation arches that screen vertical pressure, leading occurrence low-pressure above rotor. Finally, scaling law depth proposed, speed as affecting factor also taken into account.