Abstract
We derive and evaluate an explicit local time stepping (LTS) integration for the discontinuous Galerkin spectral element method on moving meshes. The LTS procedure is derived from Adams–Bashforth multirate time integration methods. We also present speedup and memory estimates, which show that the explicit LTS integration scales well with problem size. Time-step refinement studies with static and moving meshes show that the approximations are spectrally accurate in space and have design temporal accuracy. The numerical tests validate theoretical estimates that the LTS procedure can reduce computational cost by as much as an order of magnitude for time accurate problems.
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This work and the authors were supported in part by the NSF Grant DMS-0810925.
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Winters, A.R., Kopriva, D.A. High-Order Local Time Stepping on Moving DG Spectral Element Meshes. J Sci Comput 58, 176–202 (2014). https://doi.org/10.1007/s10915-013-9730-z
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DOI: https://doi.org/10.1007/s10915-013-9730-z