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Paper detail

Analysis of a Time Multigrid Algorithm for DG-Discretizations in Time

We present and analyze for a scalar linear evolution model problem a time multigrid algorithm for DG-discretizations in time. We derive asymptotically optimized parameters for the smoother, and also an asymptotically sharp convergence estimate for the two grid cycle. Our results hold for any A-stable time stepping scheme and represent the core component for space-time multigrid methods for parabolic partial differential equations. Our time multigrid method has excellent strong and weak scaling properties for parallelization in time, which we show with numerical experiments.

preprint2014arXivOpen access
Martin J. GanderMartin Neumüller
math.NA
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Martin J. GanderMartin Neumüller

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