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A unified convergence analysis for local projection stabilisationsapplied to the Oseen problem

Published online by Cambridge University Press:  04 October 2007

Gunar Matthies,
Piotr Skrzypacz and
Lutz Tobiska
Gunar Matthies
Affiliation:
Fakultät für Mathematik, Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany. gunar.matthies@ruhr-uni-bochum.de
Piotr Skrzypacz
Affiliation:
Institut für Analysis und Numerik, Otto-von-Guericke-Universität Magdeburg, Postfach 4120, 39016 Magdeburg, Germany. piotr.skrzypacz@mathematik.uni-magdeburg.de; tobiska@mathematik.uni-magdeburg.de
Lutz Tobiska
Affiliation:
Institut für Analysis und Numerik, Otto-von-Guericke-Universität Magdeburg, Postfach 4120, 39016 Magdeburg, Germany. piotr.skrzypacz@mathematik.uni-magdeburg.de; tobiska@mathematik.uni-magdeburg.de
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Abstract

The discretisation of the Oseen problem by finite element methods may sufferin general from two shortcomings. First, the discrete inf-sup (Babuška-Brezzi)condition can be violated. Second, spurious oscillationsoccur due to the dominating convection. One way to overcome bothdifficulties is the use of local projection techniques. Studying the local projection method in an abstract setting, we show that the fulfilment of a local inf-sup condition between approximation andprojection spaces allows to construct an interpolation with additional orthogonality properties. Based on this special interpolation, optimal a-priori error estimates are shown with error constants independent of the Reynolds number. Applying the general theory,we extend the results of Braack and Burman for the standard two-level versionof the local projection stabilisation to discretisations of arbitrary order onsimplices, quadrilaterals, and hexahedra. Moreover, our general theory allowsto derive a novel class of local projection stabilisation by enrichment of the approximation spaces. This class of stabilised schemes uses approximation and projection spaces defined on the same mesh and leads tomuch more compact stencils than in the two-level approach. Finally, on simplices, the spectral equivalence of the stabilising terms of the local projection method and the subgrid modelling introduced by Guermond is shown. This clarifies the relation of the local projection stabilisation to the variational multiscaleapproach.

Keywords

Stabilised finite elementsNavier-Stokes equationsequal-orderinterpolation.

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Type
Research Article
Information
ESAIM: Mathematical Modelling and Numerical Analysis , Volume 41 , Issue 4 , July 2007, pp. 713 - 742
Copyright
© EDP Sciences, SMAI, 2007

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