Abstract

In this article, a new fully implicit Monte Carlo method for solving the nonlinear radiative transfer equations is presented. This scheme is both temperature and frequency implicit, and the particle tracking is much faster than in the standard Fleck method. This tracking is used to build an energy balance matrix. This leads to an original matrix formulation of the energy balance equation, where the entries of the matrix are computed by a Monte Carlo method. This matrix formulation of the energy balance equation allows this method to be easily coupled with the Rosseland diffusion equation, which is generally needed in optically thick media, via domain decomposition. This coupling scheme between the two methods is also fully implicit. Numerical tests are shown to prove the efficiency of the matrix Monte Carlo method; the results are better than those obtained by Fleck’s method in that there are smaller computation times and there is a better robustness of the time discretization.

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