Minimal residual methods in negative or fractional Sobolev norms
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- by Harald Monsuur, Rob Stevenson and Johannes Storn
- Math. Comp. 93 (2024), 1027-1052
- DOI: https://doi.org/10.1090/mcom/3904
- Published electronically: October 12, 2023
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Abstract:
For numerical approximation the reformulation of a PDE as a residual minimisation problem has the advantages that the resulting linear system is symmetric positive definite, and that the norm of the residual provides an a posteriori error estimator. Furthermore, it allows for the treatment of general inhomogeneous boundary conditions. In many minimal residual formulations, however, one or more terms of the residual are measured in negative or fractional Sobolev norms. In this work, we provide a general approach to replace those norms by efficiently evaluable expressions without sacrificing quasi-optimality of the resulting numerical solution. We exemplify our approach by verifying the necessary inf-sup conditions for four formulations of a model second order elliptic equation with inhomogeneous Dirichlet and/or Neumann boundary conditions. We report on numerical experiments for the Poisson problem with mixed inhomogeneous Dirichlet and Neumann boundary conditions in an ultra-weak first order system formulation.References
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Bibliographic Information
- Harald Monsuur
- MR Author ID: 1566265
- ORCID: 0000-0001-9482-2010
- Rob Stevenson
- Affiliation: Korteweg-de Vries (KdV) Institute for Mathematics, University of Amsterdam, P.O. Box 94248, 1090 GE Amsterdam, The Netherlands
- MR Author ID: 310898
- ORCID: 0000-0001-7623-3060
- Email: h.monsuur@uva.nl, rob.p.stevenson@gmail.com
- Johannes Storn
- Affiliation: Department of Mathematics, University of Bielefeld, Postfach 10 01 31, 33501 Bielefeld, Germany
- MR Author ID: 1277144
- ORCID: 0000-0003-1520-6557
- Email: jstorn@math.uni-bielefeld.de
- Received by editor(s): January 26, 2023
- Received by editor(s) in revised form: July 21, 2023
- Published electronically: October 12, 2023
- Additional Notes: This research was supported by the Netherlands Organization for Scientific Research (NWO) under contract. no. SH-208-11, by the NSF Grant DMS ID 1720297, and by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – SFB 1283/2 2021 – 317210226.
- © Copyright 2023 American Mathematical Society
- Journal: Math. Comp. 93 (2024), 1027-1052
- MSC (2020): Primary 35B35, 35B45, 65N30
- DOI: https://doi.org/10.1090/mcom/3904