Preprint 2002-047

Computation of Riemann Solutions Using the Dafermos Regularization and Continuation

Stephen Schecter, Bradley J. Plohr, and Dan Marchesin

Abstract: We present a numerical method, based on the Dafermos regularization, for computing a one-parameter family of Riemann solutions of a system of conservation laws. This family corresponds to varying either the left or right state of the Riemann problem. The Riemann solutions are required to have shock waves that satisfy the viscous profile criterion prescribed by the physical model. The method uses standard continuation software to solve a boundary-value problem in which the left and right states of the Riemann problem appear as parameters. Because the continuation method can proceed around limit point bifurcations, it can sucessfully compute multiple solutions of a particular Riemann problem, including ones that correspond to unstable solutions of the viscous conservation laws.

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Stephen Schecter, <>
Bradley J. Plohr, <>
Dan Marchesin, <>
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<> September 18 2002.

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