A spatial-temporal asymptotic preserving scheme for radiation magnetohydrodynamics in the equilibrium and non-equilibrium diffusion limit

نویسندگان

چکیده

The radiation magnetohydrodynamics (RMHD) system couples the ideal equations with a gray transfer equation. main challenge is that travels at speed of light while changes time scale fluid. scales these two processes can vary dramatically. In order to use mesh sizes and steps are independent light, asymptotic preserving (AP) schemes in both space desired. this paper, we develop an AP scheme for RMHD system. Two different scalings considered. One results equilibrium diffusion limit system, other non-equilibrium idea decompose radiative intensity into three parts, each part treated differently suitable combinations explicit implicit discretizations guaranteeing favorable stability condition computational efficiency. performance method presented, optically thin thick regions, as well shock problem.

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ژورنال

عنوان ژورنال: Journal of Computational Physics

سال: 2022

ISSN: ['1090-2716', '0021-9991']

DOI: https://doi.org/10.1016/j.jcp.2021.110895