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Fluctuating hydrodynamics for driven granular gases

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Abstract

We study a granular gas heated by a stochastic thermostat in the dilute limit. Starting from the kinetic equations governing the evolution of the correlation functions, a Boltzmann-Langevin equation is constructed. The spectrum of the corresponding linearized Boltzmann-Fokker-Planck operator is analyzed, and the equation for the fluctuating transverse velocity is derived in the hydrodynamic limit. The noise term (Langevin force) is thus known microscopically and contains two terms: one coming from the thermostat and the other from the fluctuating pressure tensor. At variance with the free cooling situation, the noise is found to be white and its amplitude is evaluated.

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Authors and Affiliations

  1. Física Teórica, Universidad de Sevilla, Apartado de Correos 1065, 41080, Sevilla, Spain

    P. Maynar & M.I.G. de Soria

  2. LPTMS (CNRS UMR 8626), Université Paris-Sud, 91405, Orsay Cedex, France

    E. Trizac

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  1. P. Maynar
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  2. M.I.G. de Soria
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  3. E. Trizac
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Maynar, P., Soria, M. & Trizac, E. Fluctuating hydrodynamics for driven granular gases. Eur. Phys. J. Spec. Top. 179, 123–139 (2009). https://doi.org/10.1140/epjst/e2010-01198-x

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