KNM MFF UK

Department of Numerical Mathematics Faculty of Mathematics and Physics Charles University

Improved stability and error analysis for a class of local projection stabilizations applied to the Oseen problem

  • ID: 2611, RIV: 10132879
  • ISSN: 0749-159X, ISBN: not specified
  • source: Numerical Methods for Partial Differential Equations
  • keywords: finite element method; local projection; Oseen problem; stability; error estimates
  • authors: Petr Knobloch, Lutz Tobiska
  • authors from KNM: Knobloch Petr
  • links: http://efef2015.karlin.mff.cuni.cz/

Abstract

We consider a class of local projection stabilizations with projection spaces defined on (possibly) overlapping sets applied to the Oseen problem. We prove that the underlying bilinear form satisfies an inf-sup condition with respect to a stronger norm than coercivity suggests. A modification of the stabilization of the convection allows an optimal estimation of the consistency error. A priori estimates in the stronger norm and in the L2 norm for the pressure are established. Discontinuous pressure approximations are included in the analysis.