Nov 6 – 8, 2019
MPI Magdeburg
Europe/Berlin timezone

A parameter-dependent smoother for the multigrid method

Nov 6, 2019, 4:00 PM
25m
Prigogine (MPI Magdeburg)

Prigogine

MPI Magdeburg

MPI for Dynamics of Complex Technical Systems Sandtorstr. 1 39106 Magdeburg
Talk Talks Day I

Speaker

Tim Werthmann (RWTH Aachen)

Description

We prove the convergence of the multigrid method for parameter-dependent symmetric positive definite linear systems. We present the smoothing and approximation properties for such problems and prove the smoothing property for the parameter-dependent damped Richardson as well as the parameter-dependent damped Jacobi method.
Our theoretical results require a parameter-dependent representation of the operator, the solution, the right-hand side, the smoother as well as the prolongation and restriction. We use tensor formats to derive such a representation for linear systems with affine-linear operators. For the parameter-dependent damped Jacobi method, we derive an approximation using exponential sums and prove the smoothing property for this representation.
In numerical experiments, we observe that the convergence behavior of the multigrid method with the damped Jacobi smoother in the parameter-dependent case seems to be grid size independent.

Primary author

Tim Werthmann (RWTH Aachen)

Co-authors

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