02.06.2015 | Ausgabe 2/2016
The Staggered DG Method is the Limit of a Hybridizable DG Method. Part II: The Stokes Flow
- Zeitschrift:
- Journal of Scientific Computing > Ausgabe 2/2016
Wichtige Hinweise
Eric Chung: Supported in part by the Hong Kong RGC General Research Fund (Project: 401010).
Bernardo Cockburn: Supported in part by the National Science Foundation (Grant DMS-0712955) and by the University of Minnesota Supercomputing Institute.
Abstract
We show that the staggered discontinuous Galerkin (SDG) method (Kim et al. in SIAM J Numer Anal 51:3327–3350, 2013) for the Stokes system of incompressible fluid flow can be obtained from a new hybridizable discontinuous Galerkin (HDG) method by setting its stabilization function to zero at some suitably chosen element faces and by letting it go to infinity at all the remaining others. We then show that, as a consequence, the SDG method immediately acquires three new properties all inherited from this limiting HDG method, namely, its efficient implementation (by hybridization), its superconvergence properties, and its postprocessing of the velocity. In particular, the postprocessing of the velocity is \(\varvec{H}(\mathrm {div})\)-conforming, weakly divergence-free and converges with order \(k+2\) where \(k>0\) is the polynomial degree of the approximations.
