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ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Locomotion of an intruder within granular media
Submission Author:
Douglas Daniel de Carvalho , SP
Co-Authors:
Douglas Daniel de Carvalho, Erick de Moraes Franklin
Presenter: Douglas Daniel de Carvalho
doi://10.26678/ABCM.ENCIT2022.CIT22-0010
Abstract
From the movement of animals and machines over and within granular matter (snakes, worms and tanks) to the penetration and collision of solid objects in the sand (space probes landing on other planets and cratering), the displacement of a solid body (intruder) within a granular medium is ubiquitous in nature. We performed discrete numerical simulations of cylindrical intruders (disks) pulled at a constant velocity amid a two-dimensional set of smaller disks, confined in a rectangular cell. By varying some of the parameters involved, we obtained the instantaneous forces and contact networks, noting that the drag experienced by the intruder is approximately constant regardless of its velocity when moving at constant speed. Furthermore, we verified that contact networks percolate forces from the intruder towards the walls, being responsible for jammed regions (which, in some cases, can lead to the complete stop of the intruder's motion) and high values of the experienced drag force. We also observed a cooperative behavior when a set of intruders is moved amid the smaller grains. Part of this work can be found in Carvalho et al., Phys. Rev. E, 2022.
Keywords
Granular materials, Granular flows, Intruder, Drag
