title: Role of roughness on the hydrodynamic homogeneous base state of inelastic spheres.
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.
authors.affiliation: Departamento de Física, Universidad de Extremadura, 06071 Badajoz, Spain.
authors.forename: Francisco Vega
authors.initials: FV
authors.lastname: Reyes
authors.affiliation: Departamento de Física, Universidad de Extremadura, 06071 Badajoz, Spain.
authors.forename: Andrés
authors.initials: A
authors.lastname: Santos
authors.affiliation: Departamento de Física, Universidade Federal do Paraná, Curitiba, Brazil.
authors.forename: Gilberto M
authors.initials: GM
authors.lastname: Kremer