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Viscous Shock Capturing in a Time-Explicit DiscontinuousGalerkin Method

Published online by Cambridge University Press:  16 May 2011

A. Klöckner*
Affiliation:
Courant Institute of Mathematical Sciences, New York University, New York, NY 10012
T. Warburton
Affiliation:
Department of Computational and Applied Mathematics, Rice University, Houston, TX 77005
J. S. Hesthaven
Affiliation:
Division of Applied Mathematics, Brown University, Providence, RI 02912
*
⋆ Corresponding author. E-mail:kloeckner@cims.nyu.edu

Abstract

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We present a novel, cell-local shock detector for use with discontinuous Galerkin (DG)methods. The output of this detector is a reliably scaled, element-wise smoothnessestimate which is suited as a control input to a shock capture mechanism. Using anartificial viscosity in the latter role, we obtain a DG scheme for the numerical solutionof nonlinear systems of conservation laws. Building on work by Persson and Peraire, wethoroughly justify the detector’s design and analyze its performance on a number ofbenchmark problems. We further explain the scaling and smoothing steps necessary to turnthe output of the detector into a local, artificial viscosity. We close by providing anextensive array of numerical tests of the detector in use.

Information

Type
Research Article
Copyright
© EDP Sciences, 2011