Intruder Dynamics in a Frictional Granular Fluid: A Molecular Dynamics Study
arXiv:2010.00799 · doi:10.1103/PhysRevE.102.042905
Abstract
We study the dynamics of an intruder moving through a fluidized granular medium in three dimensions (). The intruder and grains have both translational and rotational degrees of freedom. The energy-dissipation mechanism is solid friction between all pairs of particles. We keep the granular system fluidized even at rather high densities by randomly perturbing the linear and angular velocities of the grains. We apply a constant external force of magnitude to the intruder, and obtain its steady state velocity in the center-of-mass frame of the grains. The - relation is of great interest in the industrial processing of granular matter, and has been the subject of most experiments on this problem. We also obtain the mobility, which is proportional to the inverse viscosity, as a function of the volume fraction . This is shown to diverge at the jamming volume fraction. For below the jamming fraction, we find that for small and for large . The intruder shows diffusive motion in the plane perpendicular to the direction of the external force.
arXiv comment14 Pages, 5 Figs, and 1 Table, Accepted to Phys. Rev. E
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