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Energy Conserving Explicit Local Time-Stepping for Second-Order Wave Equations

Julien Diaz 1 Marcus Grote 2
1 MAGIQUE-3D - Magique 3D. Modélisation Avancée en GéophysIQUE 3D
INRIA Futurs, UPPA - Université de Pau et des Pays de l'Adour, CNRS - Centre National de la Recherche Scientifique
Abstract : Locally refined meshes impose severe stability constraints on explicit time-stepping methods for the numerical simulation of time dependent wave phenomena. To overcome that stability restriction, local time-stepping methods are developed, which allow arbitrarily small time-steps precisely where small elements in the mesh are located. When combined with a symmetric finite element discretization in space with an essentially diagonal mass matrix, the resulting discrete numerical scheme is explicit, inherently parallel, and exactly conserves a discrete energy. Starting from the standard second-order ``leap-frog'' scheme, time-stepping methods of arbitrary order of accuracy are derived. Numerical experiments illustrate the efficiency and usefulness of these methods and validate the theory.
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Submitted on : Monday, December 3, 2007 - 10:37:32 AM
Last modification on : Monday, February 14, 2022 - 12:26:02 PM
Long-term archiving on: : Tuesday, September 21, 2010 - 3:10:00 PM


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  • HAL Id : inria-00193160, version 2



Julien Diaz, Marcus Grote. Energy Conserving Explicit Local Time-Stepping for Second-Order Wave Equations. [Research Report] RR-6377, INRIA. 2007, pp.34. ⟨inria-00193160v2⟩



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