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Helically-driven granular mobility and gravity-variant scaling relations†
Andrew Thoesen,Teresa McBryan,Hamidreza Marvi
RSC Advances Pub Date : 04/23/2019 00:00:00 , DOI:10.1039/C9RA00399A
Abstract

This study discusses the role and function of helical design as it relates to slippage during translation of a vehicle in glass bead media. We show discrete element method (DEM) and multi-body dynamics (MBD) simulations and experiments of a double-helix Archimedes screw propelled vehicle traveling in a bed of soda-lime glass beads. Utilizing granular parameters from the literature and a reduced Young's modulus, we validate the set of granular parameters against experiments. The results suggest that MBD-DEM provides reliable dynamic velocity estimates. We provide the glass, ABS, and glass–ABS simulation parameters used to obtain these results. We also examine recently developed granular scaling laws for wheels applied to these shear-driven vehicles under three different simulated gravities. The results indicate that the system obeys gravity granular scaling laws for constant slip conditions but is limited in each gravity regime when slip begins to increase.

Graphical abstract: Helically-driven granular mobility and gravity-variant scaling relations
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