Hydrodynamic Modes for Granular Gases

Details Hydrodynamic Modes for Granular Gases Hydrodynamic Modes for Granular Gases

2003-02-10

arxiv.org/abs/cond-mat/0302170v1

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevE.68.030302

The eigenfunctions and eigenvalues of the linearized Boltzmann equation for inelastic hard spheres (d=3) or disks (d=2) corresponding to d+2 hydrodynamic modes, are calculated in the long wavelength limit for a granular gas. The transport coefficients are identified and found to agree with those from the Chapman-Enskog solution. The dominance of hydrodynamic modes at long times and long wavelengths is studied via an exactly solvable kinetic model. A collisional continuum is bounded away from the hydrodynamic spectrum, assuring a hydrodynamic description at long times. The bound is closely related to the power law decay of the velocity distribution in the reference homogeneous cooling state.

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