An impact of particles' roughness on the selfdiffusion coefficient D in granular gases is investigated. For a simplified collision model where the normal, ε, and tangential, β, restitution coefficients are assumed to be constant we develop an analytical theory for the diffusion coefficient, which takes into account non-Maxwellain form of the velocity-angular velocity distribution function. We perform molecular dynamics simulations for a gas in a homogeneous cooling state and study the dependence of the selfdiffusion coefficient on ε and β. Our theoretical results are in a good agreement with the simulation data.
- Granular gases
- Rough particles