Preprint 2004-063

Implicit-Explicit Runge-Kutta Schemes and Applications to Hyperbolic Systems with Relaxation

Lorenzo Pareschi and Giovanni Russo

Abstract: We consider implicit-explicit (IMEX) Runge Kutta methods for hyperbolic systems of conservation laws with stiff relaxation terms. The explicit part is treated by a strong-stabilitypreserving (SSP) scheme, and the implicit part is treated by an L-stable diagonally implicit Runge Kutta (DIRK). The schemes proposed are asymptotic preserving (AP) in the zero relaxation limit. High accuracy in space is obtained by finite difference discretization with Weighted Essentially Non Oscillatory (WENO) reconstruction. After a brief description of the mathematical properties of the schemes, several applications will be presented.

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Lorenzo Pareschi, <>
Giovanni Russo, <>
Publishing information:
To appear in J. Sci. Comp
Submitted by:
<> November 25 2004.

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