High-Order Accurate Entropy Stable Schemes for Relativistic Hydrodynamics with General Synge-Type Equation of State

Xu，Linfeng1; Ding，Shengrong2; Wu，Kailiang3

2024-02-01

10.1007/s10915-023-02440-x

Journal of Scientific Computing   影响因子和分区

0885-7474

1573-7691

All the existing entropy stable (ES) schemes for relativistic hydrodynamics (RHD) in the literature were restricted to the ideal equation of state (EOS), which however is often a poor approximation for most relativistic flows due to its inconsistency with the relativistic kinetic theory. This paper develops high-order ES finite difference schemes for RHD with general Synge-type EOS, which encompasses a range of special EOSs. We first establish an entropy pair for the RHD equations with general Synge-type EOS in any space dimensions. We rigorously prove that the found entropy function is strictly convex and derive the associated entropy variables, laying the foundation for designing entropy conservative (EC) and ES schemes. Due to relativistic effects, one cannot explicitly express primitive variables, fluxes, and entropy variables in terms of conservative variables. Consequently, this highly complicates the analysis of the entropy structure of the RHD equations, the investigation of entropy convexity, and the construction of EC numerical fluxes. By using a suitable set of parameter variables, we construct novel two-point EC fluxes in a unified form for general Synge-type EOS. We obtain high-order EC schemes through linear combinations of the two-point EC fluxes. Arbitrarily high-order accurate ES schemes are achieved by incorporating dissipation terms into the EC schemes, based on (weighted) essentially non-oscillatory reconstructions. Additionally, we derive the general dissipation matrix for general Synge-type EOS based on the scaled eigenvectors of the RHD system. We also define a suitable average of the dissipation matrix at the cell interfaces to ensure that the resulting ES schemes can resolve stationary contact discontinuities accurately. Several numerical examples are provided to validate the accuracy and effectiveness of our schemes for RHD with four special EOSs.

Dissipation matrix Entropy conservative scheme Entropy stable scheme Equation of state Relativistic hydrodynamics

SCI ; EI

英语

第一 ; 通讯

MATHEMATICS

2-s2.0-85181848767

Scopus

1.Department of Mathematics,Southern University of Science and Technology,Shenzhen,518055,China
2.SUSTech International Center for Mathematics and Department of Mathematics,Southern University of Science and Technology,Shenzhen,518055,China
3.Department of Mathematics and SUSTech International Center for Mathematics,Southern University of Science and Technology,and National Center for Applied Mathematics Shenzhen (NCAMS),Shenzhen,518055,China

Xu，Linfeng,Ding，Shengrong,Wu，Kailiang. High-Order Accurate Entropy Stable Schemes for Relativistic Hydrodynamics with General Synge-Type Equation of State[J]. Journal of Scientific Computing,2024,98(2).

Xu，Linfeng,Ding，Shengrong,&Wu，Kailiang.(2024).High-Order Accurate Entropy Stable Schemes for Relativistic Hydrodynamics with General Synge-Type Equation of State.Journal of Scientific Computing,98(2).

Xu，Linfeng,et al."High-Order Accurate Entropy Stable Schemes for Relativistic Hydrodynamics with General Synge-Type Equation of State".Journal of Scientific Computing 98.2(2024).