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$hp$-Version space-time discontinuous Galerkin methods for parabolic problems on prismatic meshes
journal contributionposted on 2017-03-15, 16:01 authored by Andrea Cangiani, Zhaonan Dong, Emmanuil H. Georgoulis
We present a new hp-version space-time discontinuous Galerkin (dG) finite element method for the numerical approximation of parabolic evolution equations on general spatial meshes consisting of polygonal/polyhedral (polytopic) elements, giving rise to prismatic space-time elements. A key feature of the proposed method is the use of space-time elemental polynomial bases of total degree, say p, defined in the physical coordinate system, as opposed to standard dG-time-stepping methods whereby spatial elemental bases are tensorized with temporal basis functions. This approach leads to a fully discrete hp-dG scheme using fewer degrees of freedom for each time step, compared to dG time-stepping schemes employing tensorized space-time basis, with acceptable deterioration of the approximation properties. A second key feature of the new space-time dG method is the incorporation of very general spatial meshes consisting of possibly polygonal/polyhedral elements with arbitrary number of faces. A priori error bounds are shown for the proposed method in various norms. An extensive comparison among the new space-time dG method, the (standard) tensorized space-time dG methods, the classical dG-time-stepping, and conforming finite element method in space, is presented in a series of numerical experiments.
AC acknowledges partial support from the EPSRC (Grant EP/L022745/1). EHG acknowledges support from The Leverhulme Trust (Grant RPG-2015-306).
CitationSIAM Journal on Scientific Computing, 2017, 39(4), A1251–A1279
Author affiliation/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Mathematics
- VoR (Version of Record)