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arXiv · 2507.21948

Structure-preserving nodal DG method for Euler equations with gravity II: general equilibrium states

Yuchang Liu·Wei Guo·Yan Jiang·Mengping Zhang
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Abstract

We develop an entropy-stable nodal discontinuous Galerkin (DG) scheme for the Euler equations with gravity, which is also well-balanced with respect to general equilibrium solutions, including both hydrostatic and moving equilibria. The core of our approach lies in a novel treatment of the gravitational source term, combining entropy-conservative numerical fluxes with a linear entropy correction. In addition, the proposed formulation is carefully designed to ensure compatibility with a positivity-preserving limiter. We provide a rigorous theoretical analysis to establish the accuracy and structure-preserving properties of the proposed scheme. Extensive numerical experiments confirm the robustness and efficiency of the scheme.

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Yuchang Liu, Wei Guo, Yan Jiang, Mengping Zhang. 2025-07-29. Structure-preserving nodal DG method for Euler equations with gravity II: general equilibrium states. https://arxiv.org/abs/2507.21948

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