Fluctuating Navier-Stokes equations for inelastic hard spheres or disks

Details Fluctuating Navier-Stokes equations for inelastic hard spheres or disks Fluctuating Navier-Stokes equations for inelastic hard spheres or disks

2011-01-12

arxiv.org/abs/1101.2415v1

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

Starting from the fluctuating Boltzmann equation for smooth inelastic hard spheres or disks, closed equations for the fluctuating hydrodynamic fields to Navier-Stokes order are derived. This requires to derive constitutive relations for both the fluctuating fluxes and the correlations of the random forces. The former are identified as having the same form as the macroscopic average fluxes and involving the same transport coefficients. On the other hand, the random force terms exhibit two peculiarities as compared with their elastic limit for molecular systems. Firstly, they are not white, but have some finite relaxation time. Secondly, their amplitude is not determined by the macroscopic transport coefficients, but involves new coefficients.

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