Positivity-preserving high order discontinuous Galerkin schemes for compressible Euler equations with source terms

Authors:
Xiangxiong Zhang;Chi-Wang Shu
Affiliations:
Department of Mathematics, Brown University, Providence, RI 02912, United States;Division of Applied Mathematics, Brown University, Providence, RI 02912, United States
Venue:
Journal of Computational Physics
Year:
2011

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Abstract

In [16,17], we constructed uniformly high order accurate discontinuous Galerkin (DG) schemes which preserve positivity of density and pressure for the Euler equations of compressible gas dynamics with the ideal gas equation of state. The technique also applies to high order accurate finite volume schemes. For the Euler equations with various source terms (e.g., gravity and chemical reactions), it is more difficult to design high order schemes which do not produce negative density or pressure. In this paper, we first show that our framework to construct positivity-preserving high order schemes in [16,17] can also be applied to Euler equations with a general equation of state. Then we discuss an extension to Euler equations with source terms. Numerical tests of the third order Runge-Kutta DG (RKDG) method for Euler equations with different types of source terms are reported.