Riemann Solvers in General Relativistic Hydrodynamics

Details Riemann Solvers in General Relativistic Hydrodynamics Riemann Solvers in General Relativistic Hydrodynamics

1999-11-03

arxiv.org/abs/astro-ph/9911034v1

Astronomy and Astrophysics

Astrophysics

10 pages, to appear in the proceedings of the conference "Godunov methods: theory and applications", Oxford, October 1999

Scientific paper

Our contribution concerns with the numerical solution of the 3D general relativistic hydrodynamical system of equations within the framework of the 3+1 formalism. We summarize the theoretical ingredients which are necessary in order to build up a numerical scheme based on the solution of local Riemann problems. Hence, the full spectral decomposition of the Jacobian matrices of the system, i.e., the eigenvalues and the right and left eigenvectors, is explicitly shown. An alternative approach consists in using any of the special relativistic Riemann solvers recently developed for describing the evolution of special relativistic flows. Our proposal relies on a local change of coordinates in terms of which the spacetime metric is locally Minkowskian and permits an accurate description of numerical general relativistic hydrodynamics.

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