Abstract
We first explain the general concept of relaxation models using the **-**n model for scalar conservation laws. Then we consider the Suliciu model specifically for the homogeneous Euler equations. In a third step, using a two-speed relaxation model for the Euler equations with gravity as an example, we show how the construction of the relaxation system can endow the resulting method with useful properties. Finally, these properties are verified in numerical tests.
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Acknowledgements
We acknowledge the use of the Seven-League Hydro Code (https://slh-code.org) for our numerical experiments. The work of Claudius Birke and Christian Klingenberg is supported by the German Research Foundation (DFG) through the grant KL 566/22-1.
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Birke, C., Klingenberg, C. (2024). Finding an Approximate Riemann Solver via Relaxation: Concept and Advantages. In: Parés, C., Castro, M.J., Morales de Luna, T., Muñoz-Ruiz, M.L. (eds) Hyperbolic Problems: Theory, Numerics, Applications. Volume II. HYP 2022. SEMA SIMAI Springer Series, vol 35. Springer, Cham. https://doi.org/10.1007/978-3-031-55264-9_2
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