Abstract
We describe an improved multifrequency-gray method for time-dependent nonequilibrium flux-limited radiation diffusion in a high temperature system, using a two-temperature model for electrons and ions and including energy exchange between photons and electrons by Compton scattering. Our gray equation has a nonsymmetric finite difference matrix that allows us to represent negative gray diffusion coefficients, which occur in the presence of a "green-house" effect, in a numerically stable manner. Numerical results are presented.
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