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Numerical simulation of singular conservation laws and related applications

DOI https://doi.org/10.34846/le-studium.171.04.fr.01-2019

Scientific Field Computer science, Mathematics and Mathematical physics

Fellow Prof. Guoxian Chen
LE STUDIUM Multidisciplinary Journal, 2019, 3, 49-56

Guoxian Chen­1,2,3,  Magali Ribot2

 

1Computational Science Hubei Key Laboratory, School of Mathematics and Statistics, Wuhan University, Wuhan, 430072, P.R.China

2Institut Denis Poisson, Université d'Orléans, Université de Tours, CNRS UMR 7013, BP 6759, F-45067 Orléans Cedex 2, France

3 LE STUDIUM Institute for Advanced Studies, 45000 Orléans, France

ABSTRACT

We design a scheme for the Euler equations under gravitational fields based on our subcell hydrostatic reconstruction framework.

To give a proper definition of the nonconservative product terms due to the gravitational potential, we first separate the singularity to be an infinitely thin layer, on where  the potential is smoothed  by defining an intermediate potential without disturbing its monotonicity ; then the physical variables are extended and controlled to be consistent with the Rayleigh-Taylor stability, which contribute the positivity-preserving property to keep the nonnegativity of both gas density and pressure even with vacuum states. By using the hydrostatic equilibrium state variables the well-balanced property is obtained to maintain the steady state even with vacuum fronts.  In addition, we proved the full discrete discrete entropy inequality, which preserve the convergence of the solution to the physical solution, with an error term which tends to zero as the mesh size approaches to zero if the potential is Lipschitz continuous. The new scheme is very natural to understand and easy to implement.

The numerical experiments demonstrate the scheme's robustness to resolve the nonlinear waves and vacuum fronts.


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Le STUDIUM Multidisciplinary Journal