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Towards an H-theorem for granular gases

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Figure 1. Free cooling. Left) (color online) DSMC results for f x with an initial asymmetric velocity distribution made up of three sharp peaks
Figure 3. Left) DSMC results of the time evolution of H (τ ) for the the stochastic thermostat for α = 0.9, starting with a flat distribution
Figure 4. Left) Time evolution of the entropy for the nonlinear Boltzmann equation with stochastic thermostat, solved with the spectral scheme, for α = 0.25 (solid line) and α = 0.1 (dotted line), starting with the assymetric, three sharp peaks

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