Startseite A Priori and a Posteriori Error Analysis of the Crouzeix–Raviart and Morley FEM with Original and Modified Right-Hand Sides
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A Priori and a Posteriori Error Analysis of the Crouzeix–Raviart and Morley FEM with Original and Modified Right-Hand Sides

  • Carsten Carstensen und Neela Nataraj EMAIL logo
Veröffentlicht/Copyright: 11. März 2021

Abstract

This article on nonconforming schemes for m harmonic problems simultaneously treats the Crouzeix–Raviart ( m = 1 ) and the Morley finite elements ( m = 2 ) for the original and for modified right-hand side F in the dual space V * := H - m ( Ω ) to the energy space V := H 0 m ( Ω ) . The smoother J : V nc V in this paper is a companion operator, that is a linear and bounded right-inverse to the nonconforming interpolation operator I nc : V V nc , and modifies the discrete right-hand side F h := F J V nc * . The best-approximation property of the modified scheme from Veeser et al. (2018) is recovered and complemented with an analysis of the convergence rates in weaker Sobolev norms. Examples with oscillating data show that the original method may fail to enjoy the best-approximation property but can also be better than the modified scheme. The a posteriori analysis of this paper concerns data oscillations of various types in a class of right-hand sides F V * . The reliable error estimates involve explicit constants and can be recommended for explicit error control of the piecewise energy norm. The efficiency follows solely up to data oscillations and examples illustrate this can be problematic.

MSC 2010: 65N30; 65N12; 65N50

Dedicated to Peter Wriggers on the occasion of his seventieth birthday


Award Identifier / Grant number: CA 151/22-2

Funding statement: The research of the first author has been supported by the Deutsche Forschungsgemeinschaft in the Priority Program 1748 under the project “foundation and application of generalized mixed FEM towards nonlinear problems in solid mechanics” (CA 151/22-2). The finalization of this paper has been supported by SPARC project (id 235) entitled the mathematics and computation of plates.

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Received: 2020-12-16
Accepted: 2021-02-15
Published Online: 2021-03-11
Published in Print: 2021-04-01

© 2021 Walter de Gruyter GmbH, Berlin/Boston

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