Structure-preserving nodal DG method for the Euler equations with gravity: well-balanced, entropy stable, and positivity preserving
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866910853595398144 |
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| author | Liu, Yuchang Guo, Wei Jiang, Yan Zhang, Mengping |
| author_facet | Liu, Yuchang Guo, Wei Jiang, Yan Zhang, Mengping |
| contents | We propose an entropy stable and positivity preserving discontinuous Galerkin (DG) scheme for the Euler equations with gravity, which is also well-balanced for hydrostatic equilibrium states. To achieve these properties, we utilize the nodal DG framework and carefully design the source term discretization using entropy conservative fluxes. Furthermore, we demonstrate that the proposed methodology is compatible with a positivity preserving scaling limiter, ensuring positivity of density and pressure under an appropriate CFL condition. To the best of our knowledge, this is the first DG scheme to simultaneously achieve these three properties with theoretical justification. Numerical examples further demonstrate its robustness and efficiency. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_00553 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Structure-preserving nodal DG method for the Euler equations with gravity: well-balanced, entropy stable, and positivity preserving Liu, Yuchang Guo, Wei Jiang, Yan Zhang, Mengping Numerical Analysis We propose an entropy stable and positivity preserving discontinuous Galerkin (DG) scheme for the Euler equations with gravity, which is also well-balanced for hydrostatic equilibrium states. To achieve these properties, we utilize the nodal DG framework and carefully design the source term discretization using entropy conservative fluxes. Furthermore, we demonstrate that the proposed methodology is compatible with a positivity preserving scaling limiter, ensuring positivity of density and pressure under an appropriate CFL condition. To the best of our knowledge, this is the first DG scheme to simultaneously achieve these three properties with theoretical justification. Numerical examples further demonstrate its robustness and efficiency. |
| title | Structure-preserving nodal DG method for the Euler equations with gravity: well-balanced, entropy stable, and positivity preserving |
| topic | Numerical Analysis |
| url | https://arxiv.org/abs/2503.00553 |