Conservative discontinuous Galerkin method for supercritical, real-fluid flows
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866912081122426880 |
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| author | Ching, Eric J. Johnson, Ryan F. |
| author_facet | Ching, Eric J. Johnson, Ryan F. |
| contents | This paper presents a conservative discontinuous Galerkin method for the simulation of supercritical and transcritical real-fluid flows without phase separation. A well-known issue associated with the use of fully conservative schemes is the generation of spurious pressure oscillations at contact interfaces, which are exacerbated when a cubic equation of state and thermodynamic relations appropriate for this high-pressure flow regime are considered. To reduce these pressure oscillations, which can otherwise lead to solver divergence in the absence of additional dissipation, an L2-projection of primitive variables is performed in the evaluation of the flux. We apply the discontinuous Galerkin formulation to a variety of test cases. The first case is the advection of a sinusoidal density wave, which is used to verify the convergence of the scheme. The next two involve one- and two-dimensional advection of a nitrogen/n-dodecane thermal bubble, in which the ability of the methodology to reduce pressure oscillations and maintain solution stability is assessed. The final test cases consist of two- and three-dimensional injection of an n-dodecane jet into a nitrogen chamber. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_13810 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Conservative discontinuous Galerkin method for supercritical, real-fluid flows Ching, Eric J. Johnson, Ryan F. Fluid Dynamics This paper presents a conservative discontinuous Galerkin method for the simulation of supercritical and transcritical real-fluid flows without phase separation. A well-known issue associated with the use of fully conservative schemes is the generation of spurious pressure oscillations at contact interfaces, which are exacerbated when a cubic equation of state and thermodynamic relations appropriate for this high-pressure flow regime are considered. To reduce these pressure oscillations, which can otherwise lead to solver divergence in the absence of additional dissipation, an L2-projection of primitive variables is performed in the evaluation of the flux. We apply the discontinuous Galerkin formulation to a variety of test cases. The first case is the advection of a sinusoidal density wave, which is used to verify the convergence of the scheme. The next two involve one- and two-dimensional advection of a nitrogen/n-dodecane thermal bubble, in which the ability of the methodology to reduce pressure oscillations and maintain solution stability is assessed. The final test cases consist of two- and three-dimensional injection of an n-dodecane jet into a nitrogen chamber. |
| title | Conservative discontinuous Galerkin method for supercritical, real-fluid flows |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2410.13810 |