期刊
COMMUNICATIONS IN COMPUTATIONAL PHYSICS
卷 24, 期 5, 页码 1326-1354出版社
GLOBAL SCIENCE PRESS
DOI: 10.4208/cicp.OA-2017-0188
关键词
Electronic M-1 moment model; approximate Riemann solvers; Godunov type schemes; asymptotic preserving schemes; diffusive limit; plasma physics; anisotropic diffusion
This work is devoted to the derivation of an admissible asymptotic-preserving scheme for the electronic M-1 model in the diffusive regime. A numerical scheme is proposed in order to deal with the mixed derivatives which arise in the diffusive limit leading to an anisotropic diffusion. The derived numerical scheme preserves the realisability domain and enjoys asymptotic-preserving properties correctly handling the diffusive limit recovering the relevant limit equation. In addition, the cases of non constants electric field and collisional parameter are naturally taken into account with the present approach. Numerical test cases validate the considered scheme in the non-collisional and diffusive limits.
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