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2018 A semi-implicit multiscale scheme for shallow water flows at low Froude number
Stefan Vater, Rupert Klein
Commun. Appl. Math. Comput. Sci. 13(2): 303-336 (2018). DOI: 10.2140/camcos.2018.13.303


A new large time step semi-implicit multiscale method is presented for the solution of low Froude number shallow water flows. While on small scales which are under-resolved in time the impact of source terms on the divergence of the flow is essentially balanced, on large resolved scales the scheme propagates free gravity waves with minimized diffusion. The scheme features a scale decomposition based on multigrid ideas. Two different time integrators are blended at each scale depending on the scale-dependent Courant number for gravity wave propagation. The finite volume discretization is implemented in the framework of second-order Godunov-type methods for conservation laws. The basic properties of the method are validated by numerical tests. This development is a further step in the construction of asymptotically adaptive numerical methods for the computation of large-scale atmospheric flows.


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Stefan Vater. Rupert Klein. "A semi-implicit multiscale scheme for shallow water flows at low Froude number." Commun. Appl. Math. Comput. Sci. 13 (2) 303 - 336, 2018.


Received: 1 December 2017; Revised: 27 June 2018; Accepted: 16 July 2018; Published: 2018
First available in Project Euclid: 27 September 2018

zbMATH: 06987252
MathSciNet: MR3857877
Digital Object Identifier: 10.2140/camcos.2018.13.303

Primary: 65M08 , 86A10

Keywords: asymptotically adaptive numerical methods , balanced modes , large time steps , multiscale time integration , shallow water equations

Rights: Copyright © 2018 Mathematical Sciences Publishers


Vol.13 • No. 2 • 2018
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