Modified Sonine approximation for the Navier–Stokes transport coefficients of a granular gas

Vicente Garzó, Andrés Santos and José María Montanero

Physica A: Statistical Mechanics and its Applications, 2007, vol. 376, issue C, 94-107

Abstract: Motivated by the disagreement found at high dissipation between simulation data for the heat flux transport coefficients and the expressions derived from the Boltzmann equation by the standard first Sonine approximation [J.J. Brey, M.J. Ruiz-Montero, Phys. Rev. E 70 (2004) 051301, J.J. Brey, M.J. Ruiz-Montero, P. Maynar, M.I. García de Soria, J. Phys. Condens. Matter 17 (2005) S2489], we implement in this paper a modified version of the first Sonine approximation in which the Maxwell–Boltzmann weight function is replaced by the homogeneous cooling state (HCS) distribution. The structure of the transport coefficients is common in both approximations, the distinction appearing in the coefficient of the fourth cumulant a2. Comparison with computer simulations shows that the modified approximation significantly improves the estimates for the heat flux transport coefficients at strong dissipation. In addition, the slight discrepancies between simulation and the standard first Sonine estimates for the shear viscosity and the self-diffusion coefficient are also partially corrected by the modified approximation. Finally, the extension of the modified first Sonine approximation to the transport coefficients of the Enskog kinetic theory is presented.

Keywords: Granular gases; Boltzmann kinetic theory; Navier–Stokes transport coefficients; Sonine approximation (search for similar items in EconPapers)
Date: 2007
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Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:376:y:2007:i:c:p:94-107

DOI: 10.1016/j.physa.2006.10.081

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