Abstract
The classical Chapman–Enskog expansions for the pressure deviator P and heat flux q provide a natural bridge between the kinetic description of gas dynamics as given by the Boltzmann equation and continuum mechanics as given by the balance laws of mass, momentum, energy supplemented by the expansions for P and q. Truncation of these expansions beyond first (Navier–Stokes) order yields instability of the rest state and is inconsistent with thermodynamics. In this paper we propose a visco-elastic relaxation approximation that eliminates the instability paradox. This system is weakly parabolic, has a linearly hyperbolic convection part, and is endowed with a generalized entropy inequality. It agrees with the solution of the Boltzmann equation up to the Burnett order via the Chapman–Enskog expansion.
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Jin, S., Slemrod, M. Regularization of the Burnett Equations via Relaxation. Journal of Statistical Physics 103, 1009–1033 (2001). https://doi.org/10.1023/A:1010365123288
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DOI: https://doi.org/10.1023/A:1010365123288