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Towards a geometric variational discretization of compressible fluids: the rotating shallow water equations

Werner Bauer 1, 2, 3 François Gay-Balmaz 4, 3
1 FLUMINANCE - Fluid Flow Analysis, Description and Control from Image Sequences
IRMAR - Institut de Recherche Mathématique de Rennes, IRSTEA - Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture, Inria Rennes – Bretagne Atlantique
Abstract : This paper presents a geometric variational discretization of compressible fluid dynamics. The numerical scheme is obtained by discretizing, in a structure preserving way, the Lie group formulation of fluid dynamics on diffeomorphism groups and the associated variational principles. Our framework applies to irregular mesh discretizations in 2D and 3D. It systematically extends work previously made for incompressible fluids to the compressible case. We consider in detail the numerical scheme on 2D irregular simplicial meshes and evaluate the scheme numerically for the rotating shallow water equations. In particular, we investigate whether the scheme conserves stationary solutions, represents well the nonlinear dynamics, and approximates well the frequency relations of the continuous equations, while preserving conservation laws such as mass and total energy.
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Submitted on : Monday, December 17, 2018 - 5:11:46 PM
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Werner Bauer, François Gay-Balmaz. Towards a geometric variational discretization of compressible fluids: the rotating shallow water equations. Journal of Computational Dynamics, American Institute of Mathematical Sciences, 2018, 1-40, ⟨10.3934/jcd.2019001⟩. ⟨hal-01958134⟩

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