Inhomogeneous Cooling of the Rough Granular Gas in Two Dimensions

Abstract

We study the inhomogeneous clustered regime of a freely cooling granular gas of rough particles in two dimensions using large-scale event driven simulations and scaling arguments. During collisions, rough particles dissipate energy in both the normal and tangential directions of collision. In the inhomogeneous regime, translational kinetic energy and the rotational energy decay with time $t$ as power-laws $t^{-{\theta }_T}$ and $t^{-{\theta }_R}$. We numerically determine ${\theta }_T\approx 1$ and ${\theta }_R\approx 1.6$, independent of the coefficients of restitution. The inhomogeneous regime of the granular gas has been argued to be describable by the ballistic aggregation problem, where particles coalesce on contact. Using scaling arguments, we predict ${\theta }_T=1$ and ${\theta }_R=1$ for ballistic aggregation, ${\theta }_R$ being different from that obtained for the rough granular gas. Simulations of ballistic aggregation with rotational degrees of freedom are consistent with these exponents.

arXiv comment6 pages, 5 figures

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• Shock propagation in locally driven granular systems
• Velocity Distribution of Driven Inelastic One-component Maxwell gas
• Asymptotic behavior of the velocity distribution of driven inelastic gas with scalar velocities: analytical results
• Asymptotic velocity distribution of a driven one dimensional binary granular Maxwell gas
• Hydrodynamics of granular gases of inelastic and rough hard disks or spheres. II. Stability analysis