Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2010-05-22
Phys. Rev. E 82, 011305 (2010)
Physics
Condensed Matter
Soft Condensed Matter
10 pages, 7 figures, submitted for publication
Scientific paper
10.1103/PhysRevE.82.011305
We investigate hydrodynamic noise in a dilute granular gas during the homogeneous cooling state, by means of a proper application of the Direct Simulation Monte Carlo (DSMC) algorithm. The DSMC includes a source of randomization which is not present in Molecular Dynamics (MD) for inelastic hard disks. Notwithstanding this difference, a fair quantitative agreement is found, including a violation of the fluctuation-dissipation relation for the noise amplitude of the same order observed in MD. This study suggests that deterministic collision dynamics is not an essential ingredient to reproduce, up to a good degree of approximation, hydrodynamic fluctuations in dilute granular gases.
Costantini Giulio
Puglisi Andrea
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