Role of roughness on the hydrodynamic homogeneous base state of inelastic spheres
arXiv:1309.2369 · doi:10.1103/PhysRevE.89.020202
Abstract
A gas of inelastic rough spheres admits a spatially homogeneous base state which turns into a hydrodynamic state after a finite relaxation time. We show that this relaxation time is hardly dependent on the degree of inelasticity but increases dramatically with decreasing roughness. An accurate description of translational-rotational velocity correlations at all times is also provided. At a given inelasticity, the roughness parameter can be tuned to produce a huge distortion from the Maxwellian distribution function. The results are obtained from a Grad-like solution of the Boltzmann-Enskog equation complemented by Monte Carlo and molecular dynamics simulations.
5+4 pages, 4+4 figures; v2: Molecular dynamics results added; Supplemental Material included as an Appendix
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