Dispersive and dissipative behaviour of high order discontinuous Galerkin finite element methods

M. Ainsworth

Research output: Contribution to journalArticle

194 Citations (Scopus)

Abstract

The dispersive and dissipative properties of hp version discontinuous Galerkin finite element approximation are studied in three different limits. For the small wave-number limit hk→0, we show the discontinuous Galerkin gives a higher order of accuracy than the standard Galerkin procedure, thereby confirming the conjectures of Hu and Atkins [J. Comput. Phys. 182 (2) (2002) 516]. If the mesh is fixed and the order p is increased, it is shown that the dissipation and dispersion errors decay at a super-exponential rate when the order p is much larger than hk. Finally, if the order is chosen so that 2p+1≈κhk for some fixed constant κ>1, then it is shown that an exponential rate of decay is obtained.
Original languageEnglish
Pages (from-to)106-130
Number of pages24
JournalJournal of Computational Physics
Volume198
Issue number1
DOIs
Publication statusPublished - 20 Jul 2004

Keywords

  • discrete dispersion relation
  • high wave number
  • discontinuous Galerkin approximation
  • hp-finite element method
  • computational physics

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