Awadhesh Kumar Dubey, Anna Bodrova, Sanjay Puri, Nikolai Brilliantov
We present large-scale Molecular Dynamics simulation results for granular gases of particles with the velocity-dependent restitution coefficient, as it follows from the simplest first-principle model of viscoelastic spheres. We analyze both cases of force-free gases and homogeneously heated gases. We develop a theory for the velocity distribution for heated gases. We explored evolution of temperature and the Sonine coefficient, which characterize the form of the velocity distribution function. We observed that for not large dissipation the simulation results are in excellent agreement with both, the existing theory for gases in a homogeneous cooling state and with the novel theory for heated gases. At the same time a noticeable discrepancy between theory and MD results have been detected for large dissipations. We analyze the adequacy of the simplified model of a constant effective restitution coefficient for uniformly heated gases of viscoelastic particles. We conclude that while this model may be used to describe temperature of a gas, it fails to describe quantitatively both temperature and the velocity distribution function.
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http://arxiv.org/abs/1209.5326
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