A NEW APPROACH TO RECOVERY OF DISCONTINUOUS GALERKIN

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

Abstract

A new recovery operator P : Q(n)(disc)(T) -> Q(n+1)(disc)(M) for discontinuous Galerkin is derived. It is based on the idea of projecting a discontinuous, piecewise polynomial solution on a given mesh T into a higher order polynomial space on a macro mesh M. In order to do so, we define local degrees of freedom using polynomial moments and provide global degrees of freedom on the macro mesh. We prove consistency with respect to the local L-2-projection, stability results in several norms and optimal anisotropic error estimates. As an example, we apply this new recovery technique to a stabilized solution of a singularly perturbed convection-diffusion problem using bilinear elements.

Details

Original languageEnglish
Pages (from-to)697-712
Number of pages16
JournalJournal of computational mathematics
Volume27
Issue number6
Publication statusPublished - Nov 2009
Peer-reviewedYes

External IDs

Scopus 72449169437
ORCID /0000-0002-2458-1597/work/142239720

Keywords

Keywords

  • Discontinuous Galerkin, Postprocessing, Recovery, CONVECTION-DIFFUSION PROBLEM, SUPERCONVERGENCE, ELEMENTS, SDFEM