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Mathematics of Computation

Published by the American Mathematical Society since 1960 (published as Mathematical Tables and other Aids to Computation 1943-1959), Mathematics of Computation is devoted to research articles of the highest quality in computational mathematics.

ISSN 1088-6842 (online) ISSN 0025-5718 (print)

The 2020 MCQ for Mathematics of Computation is 1.78.

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Rayleigh–Ritz approximation of the inf-sup constant for the divergence
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by Dietmar Gallistl HTML | PDF
Math. Comp. 88 (2019), 73-89 Request permission

Abstract:

A numerical scheme for computing approximations to the inf-sup constant of the divergence operator in bounded Lipschitz polytopes in $\mathbb R^n$ is proposed. The method is based on a conforming approximation of the pressure space based on piecewise polynomials of some fixed degree $k\geq 0$. The scheme can be viewed as a Rayleigh–Ritz method and it gives monotonically decreasing approximations of the inf-sup constant under mesh refinement. The new approximation replaces the $H^{-1}$ norm of a gradient by a discrete $H^{-1}$ norm which behaves monotonically under mesh refinement. By discretizing the pressure space with piecewise polynomials, upper bounds to the inf-sup constant are obtained. Error estimates are presented that prove convergence rates for the approximation of the inf-sup constant provided it is an isolated eigenvalue of the corresponding noncompact eigenvalue problem; otherwise, plain convergence is achieved. Numerical computations on uniform and adaptive meshes are provided.
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Additional Information
  • Dietmar Gallistl
  • Affiliation: Institut für Angewandte und Numerische Mathematik, Karlsruher Institut für, Technologie, 76128 Karlsruhe, Germany
  • Address at time of publication: Department of Applied Mathematics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
  • MR Author ID: 1020312
  • Email: d.gallistl@utwente.nl
  • Received by editor(s): June 23, 2017
  • Received by editor(s) in revised form: September 14, 2017
  • Published electronically: March 29, 2018
  • Additional Notes: This work was supported by the Deutsche Forschungsgemeinschaft (DFG) through CRC 1173.
  • © Copyright 2018 American Mathematical Society
  • Journal: Math. Comp. 88 (2019), 73-89
  • MSC (2010): Primary 65N12, 65N15, 65N30, 76D07
  • DOI: https://doi.org/10.1090/mcom/3327
  • MathSciNet review: 3854051