

Author: Costantini G. Puglisi A.
Publisher: Edp Sciences
E-ISSN: 1760-6101|6|4|2-18
ISSN: 0973-5348
Source: Mathematical Modelling of Natural Phenomena , Vol.6, Iss.4, 2011-07, pp. : 2-18
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Abstract
We perform a numerical study of the fluctuations of the rescaled hydrodynamic transverse velocity field during the cooling state of a homogeneous granular gas. We are interested in the role of Molecular Chaos for the amplitude of the hydrodynamic noise and its relaxation in time. For this purpose we compare the results of Molecular Dynamics (MD, deterministic dynamics) with those from Direct Simulation Monte Carlo (DSMC, random process), where Molecular Chaos can be directly controlled. It is seen that the large time decay of the fluctuation’s autocorrelation is always dictated by the viscosity coefficient predicted by granular hydrodynamics, independently of the numerical scheme (MD or DSMC). On the other side, the noise amplitude in Molecular Dynamics, which is known to
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