Thermodynamically admissible 13-moment equations

Grad's 13-moment equations describe transport in mildly rarefied gases well, but are not properly embedded into nonequilibrium thermodynamics since they accompanied by a formulation of the second law. In this work, Grad-13 framework GENERIC (general equation for reversible–irreversible coupling), which demands additional contributions to guarantee thermodynamic structure. As building blocks, we use Poisson matrix basic convection behavior and antisymmetric friction matrices correct convective terms. The ensuing GENERIC-13 completely match up second-order terms Knudsen number fulfill all requirements.