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A structure-preserving split finite element discretization of the rotating shallow water equations in split Hamiltonian form

Werner Bauer 1, 2 Jörn Behrens 3, 4 Colin J Cotter 2 
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 : We introduce locally conservative, structure-preserving split finite element (FE) discretizations of a y-independent (slice) model of the covariant rotating shallow water equations. Studying this y-independent model case provides insight towards developing schemes for the full 2D rotating shallow equations and more sophisticated models. These split schemes are derived using the split Hamiltonian FE method, which is an extension of the split FE framework of Bauer and Behrens (2018) . The splitting introduces two chains of compatible FE spaces such that the differential operators hold strongly. This leads to a separation of the set of equations into topological prognostic and metric-dependent closure equations. Consequently, the structure preservation is related to the topological equations, namely the conservation of the Hamiltonian (i.e. energy) follows from the antisymmetry of the Poisson bracket and the conservation of mass, potential vorticity and potential enstrophy from the bracket's Casimirs. These structure-preserving properties are not affected by the metric closure equations that, in turn, carry metric information and are therefore responsible for the schemes' accuracy, stability, convergence and discrete dispersion properties. We verify the clear separation of structure preservation and numerical properties analytically and show numerical examples of geophysical relevance for a low order single mesh implementation.
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Submitted on : Friday, February 15, 2019 - 11:14:45 AM
Last modification on : Friday, May 20, 2022 - 9:04:52 AM
Long-term archiving on: : Friday, May 17, 2019 - 12:56:03 PM


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  • HAL Id : hal-02020379, version 1


Werner Bauer, Jörn Behrens, Colin J Cotter. A structure-preserving split finite element discretization of the rotating shallow water equations in split Hamiltonian form. 2019. ⟨hal-02020379⟩



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