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2021 | OriginalPaper | Buchkapitel

Matrix Oriented Reduction of Space-Time Petrov-Galerkin Variational Problems

verfasst von : Julian Henning, Davide Palitta, Valeria Simoncini, Karsten Urban

Erschienen in: Numerical Mathematics and Advanced Applications ENUMATH 2019

Verlag: Springer International Publishing

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Abstract

Variational formulations of time-dependent PDEs in space and time yield (d + 1)-dimensional problems to be solved numerically. This increases the number of unknowns as well as the storage amount. On the other hand, this approach enables adaptivity in space and time as well as model reduction w.r.t. both type of variables. In this paper, we show that matrix oriented techniques can significantly reduce the computational timings for solving the arising linear systems outperforming both time-stepping schemes and other solvers.

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Fußnoten
1
\(H^1_{(0)}(I;X'):= \{ w:I\to X':\, w\in H^1(I;X'), w(0)=0\}\), recall that \(H^1(I;X')\hookrightarrow C(\bar {I};X')\).
 
3
Since the preconditioner is a non-linear operator, a flexible variant of GMRES is used.
 
4
The LU factors of the CN coefficient matrix are computed once and for all at the beginning of the procedure.
 
5
We employ GMRES preconditioned with ILU (zero fill-in). The same solver is used for the RKSM basis construction.
 
6
Generalized Lyapunov (i.e., Sylvester) equation solver, [3].
 
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Metadaten
Titel
Matrix Oriented Reduction of Space-Time Petrov-Galerkin Variational Problems
verfasst von
Julian Henning
Davide Palitta
Valeria Simoncini
Karsten Urban
Copyright-Jahr
2021
DOI
https://doi.org/10.1007/978-3-030-55874-1_104