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

Banff International Research Station for Mathematical Innovation and Discovery

In this talk we present a geometric variational discretization of equations describing compressible fluids. 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 details 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.

Mathematics; Numerical analysis

video/mp4

Author affiliation: Imperial College London

2017-12-11

Attribution-NonCommercial-NoDerivatives 4.0 International

http://hdl.handle.net/2429/63891

Unreviewed

http://creativecommons.org/licenses/by-nc-nd/4.0/