Abstract
The construction of discontinuous Galerkin (DG) methods for the compressible Euler equations includes the approximation of non-linear flux terms in the volume integrals. The terms can lead to aliasing and stability issues. The entropy and kinetic energy are elevated in smooth, but under-resolved parts of the solution which are affected by aliasing. In this work the split form DG framework is used to construct entropy conservative (EC) or kinetic energy preserving (KEP) nodal discontinuous Galerkin spectral element methods (DGSEM) to solve the Euler equations on moving hexahedral meshes. The Arbitrary Lagrangian Eulerian (ALE) approach is used to include the effect of mesh motion in the split form DG methods. Since the EC or KEP property is not sufficient to tame discontinuities in the numerical solution, the split form ALE DGSEM are modified by adding numerical dissipation matrices to the EC or KEP surface numerical fluxes. This leads to entropy stable (ES) or kinetic energy dissipative (KED) methods. The three dimensional Taylor-Green vortex (TGV) is investigated to analyze the properties of the constructed split form ALE DGSEM.
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Acknowledgements
This research is supported by the European Research Council (ERC) under the European Union’s Eights Framework Program Horizon 2020 with the research project Extreme, ERC grant agreement no. 714487. The authors gratefully acknowledge the support and the computing time on “Hazel Hen” provided by the High-Performance Computing Center Stuttgart (HLRS) through the project hpcdg”.
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Schnücke, G., Gassner, G.J., Krais, N. (2023). Split Form ALE DG Methods for the Euler Equations: Entropy Stability and Kinetic Energy Dissipation. In: Melenk, J.M., Perugia, I., Schöberl, J., Schwab, C. (eds) Spectral and High Order Methods for Partial Differential Equations ICOSAHOM 2020+1. Lecture Notes in Computational Science and Engineering, vol 137. Springer, Cham. https://doi.org/10.1007/978-3-031-20432-6_27
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