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• W3029016257 abstract "Local time-stepping methods permit to overcome the severe stability constraint on explicit methods caused by local mesh refinement without sacrificing explicitness. In cite{DiazGrote09}, a leapfrog based explicit local time-stepping (LF-LTS) method was proposed for the time integration of second-order wave equations. Recently, optimal convergence rates were proved for a conforming FEM discretization, albeit under a CFL stability condition where the global time-step, $Delta t$, depends on the smallest elements in the mesh cite{grote_sauter_1}. In general one cannot improve upon that stability constraint, as the LF-LTS method may become unstable at certain discrete values of $Delta t$. To remove those critical values of $Delta t$, we apply a slight modification (as in recent work on LF-Chebyshev methods cite{CarHocStu19}) to the original LF-LTS method which nonetheless preserves its desirable properties: it is fully explicit, second-order accurate, satisfies a three-term (leapfrog like) recurrence relation, and conserves the energy. The new stabilized LF-LTS method also yields optimal convergence rates for a standard conforming FE discretization, yet under a CFL condition where $Delta t$ no longer depends on the mesh size inside the locally refined region." @default.
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• W3029016257 date "2020-05-27" @default.
• W3029016257 modified "2023-09-27" @default.
• W3029016257 title "Stabilized leapfrog based local time-stepping method for the wave equation" @default.
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