Hostname: page-component-6898cfcb55-th4rj Total loading time: 0 Render date: 2026-11-11T20:11:29.727Z Has data issue: false hasContentIssue false

Finite Volume Evolution Galerkin Methods for the Shallow Water Equations with Dry Beds

Published online by Cambridge University Press:  20 August 2015

Andreas Bollermann*
Affiliation:
IGPM, RWTH Aachen, Templergraben 55, 52062 Aachen, Germany
Sebastian Noelle*
Affiliation:
IGPM, RWTH Aachen, Templergraben 55, 52062 Aachen, Germany
Maria Lukáčová-Medvid’ová*
Affiliation:
Institut fir Mathematik, Universität Mainz, Staudingerweg 9, 55099 Mainz, Germany
Get access

Abstract

We present a new Finite Volume Evolution Galerkin (FVEG) scheme for the solution of the shallow water equations (SWE) with the bottom topography as a source term. Our new scheme will be based on the FVEG methods presented in (Noelle and Kraft, J. Comp. Phys., 221 (2007)), but adds the possibility to handle dry boundaries. The most important aspect is to preserve the positivity of the water height. We present a general approach to ensure this for arbitrary finite volume schemes. The main idea is to limit the outgoing fluxes of a cell whenever they would create negative water height. Physically, this corresponds to the absence of fluxes in the presence of vacuum. Wellbalancing is then re-established by splitting gravitational and gravity driven parts of the flux. Moreover, a new entropy fix is introduced that improves the reproduction of sonic rarefaction waves.

Information

Type
Research Article
Copyright
Copyright © Global Science Press Limited 2011

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable