## On physical-constraints-preserving schemes for special relativistic magnetohydrodynamics with a general equation of state.(English)Zbl 1394.65149

Summary: The paper studies the physical-constraints-preserving (PCP) schemes for multi-dimensional special relativistic magnetohydrodynamics with a general equation of state (EOS) on more general meshes. It is an extension of the work [K. Wu and H. Tang, Math. Models Methods Appl. Sci. 27, No. 10, 1871–1928 (2017; Zbl 1371.76096)] which focuses on the ideal EOS and uniform Cartesian meshes. The general EOS without a special expression poses some additional difficulties in discussing the mathematical properties of admissible state set with the physical constraints on the fluid velocity, density and pressure. Rigorous analyses are provided for the PCP property of finite volume or discontinuous Galerkin schemes with the Lax-Friedrichs (LxF)-type flux on a general mesh with non-self-intersecting polytopes. Those are built on a more general form of generalized LxF splitting property and a different convex decomposition technique. It is shown in theory that the PCP property is closely connected with a discrete divergence-free condition, which is proposed on the general mesh and milder than that in [Wu and Tang, loc. cit.].

### MSC:

 65N30 Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs 76M10 Finite element methods applied to problems in fluid mechanics 76Y05 Quantum hydrodynamics and relativistic hydrodynamics 76W05 Magnetohydrodynamics and electrohydrodynamics

Zbl 1371.76096
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