Title: Rotating Intruders in Dense Granular Beds

Author (Table Talk): Robin Burton, The University of Edinburgh

Abstract:

We investigate, via simulation and experiment, the forces felt by a cylindrical intruder pushed vertically into a dense granular bed. When the intruder rotates about its axis perpendicular to gravity it experiences a reduction in the vertical force resisting penetration. This reduction is positively correlated with the rotation speed. To understand how this arises we study the relationship between the competing forces of drag, lift, gravity and torque on the intruder. Unlike movement through liquids or air our understanding of locomotion in granular media is still quite limited, and as well as being of scientific interest, it is hoped that an increased understanding in this area will help our industrial partner Crover to enhance the performance of their granular drone.