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Reports (Research Report) Year : 2007

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

Marcus J. Grote
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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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Dates and versions

inria-00193160 , version 1 (30-11-2007)
inria-00193160 , version 2 (03-12-2007)

Identifiers

  • HAL Id : inria-00193160 , version 2

Cite

Julien Diaz, Marcus J. 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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