Preprint 1997-034

2D Shallow Water Equations by Composite Schemes

Richard Liska and Burton Wendroff

Abstract: Composite schemes are formed by global composition of several Lax-Wendroff steps followed by a diffusive Lax-Friedrichs or WENO step which filters out the oscillations around shocks typical for the Lax-Wendroff scheme. These schemes are applied to the shallow water equations in 2D. The Lax-Friedrichs composite is also formulated for a trapezoidal mesh, which is necessary in several example problems. The suitability of the composite schemes for the shallow water equations is demonstrated on several examples including the circular dam break problem, the shock focussing problem and supercritical channel flow problems.

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2D shallow water equations by composite schemes
Richard Liska , <>
Burton Wendroff, <>
Publishing information:
Technical Report LAUR-97-4879, LANL, Los Alamos, 1997.
Submitted by:
<> December 5 1997.

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Last modified: Fri Dec 5 11:03:59 1997