Mohamed, Kamel; Abdelrahman, Mahmoud A. E. The modified Rusanov scheme for solving the ultra-relativistic Euler equations. (English) Zbl 1497.65146 Eur. J. Mech., B, Fluids 90, 89-98 (2021). Authors’ abstract: This paper considers the ultra-relativistic Euler equations for an ideal gas, which are described in terms of the pressure \(p\) and the spatial part \(u \in \mathbb{R}^3\) of the dimensionless four-velocity. First, the authors provide an exact solution to the Riemann problem for this system. Then, they turn to the main results of the paper, namely the derivation of a modified Rusanov scheme. The authors’ scheme consists of predictor and corrector stages. The predictor stage contains a parameter \(\alpha_{i + \frac 1 2}^n\), which is responsbible for the numerical diffusion. In order to control this parameter, the authors introduce a strategy depending on limiter theory and using Riemann invariants. The corrector stage projects back to the conservation equation. The scheme thus computes an approxmation of the Riemann problem solution. The numerical results show the high resolution of the proposed finite volume scheme (modified Rusanov) and confirm its capability to provide accurate simulations for the ultra-relativistic Euler equations under regimes with strong shocks and rarefactions, especially compared to the traditional Rusanov scheme. Reviewer: Victor Michel-Dansac (Strasbourg) Cited in 2 Documents MSC: 65M08 Finite volume methods for initial value and initial-boundary value problems involving PDEs 65M06 Finite difference methods for initial value and initial-boundary value problems involving PDEs 35L45 Initial value problems for first-order hyperbolic systems 35L65 Hyperbolic conservation laws 35L67 Shocks and singularities for hyperbolic equations 76Y05 Quantum hydrodynamics and relativistic hydrodynamics 76L05 Shock waves and blast waves in fluid mechanics 76N15 Gas dynamics (general theory) 35Q31 Euler equations Keywords:relativistic Euler equations; entropy shocks; rarefaction waves; Riemann invariants; Riemann solutions; finite volume scheme; modified Rusanov scheme PDF BibTeX XML Cite \textit{K. Mohamed} and \textit{M. A. E. Abdelrahman}, Eur. J. 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