Publication Results

Code: 29/2015
Title: Review of Discontinuous Galerkin Finite Element Methods for Partial Differential Equations on Complicated Domains
Date: Saturday 13th June 2015
Author(s) : Antonietti, P.f.; Cangiani, A.; Collis, J.; Dong, Z.; Georgoulis, E.h.; Giani, S.; Houston, P.
Download link:
Abstract: The numerical approximation of partial differential equations (PDEs) posed on complicated geometries, which include a large number of small geometrical features or microstructures, represents a challenging computational problem. Indeed, the use of standard mesh generators, employing simplices or tensor product elements, for example, naturally leads to very fine finite element meshes, and hence the computational effort required to numerically approximate the underlying PDE problem may be prohibitively expensive. As an alternative approach, in this article we present a review of composite/agglomerated discontinuous Galerkin finite element methods (DGFEMs) which employ general polytopic elements. Here, the elements are typically constructed as the union of standard element shapes; in this way, the minimal dimension of the underlying composite finite element space is independent of the number of geometrical features. In particular, we provide an overview of hpversion inverse estimates and approximation results for general polytopic elements, which are sharp with respect to element facet degeneration. On the basis of these results, a priori error bounds for the hpDGFEM approximation of both secondorder elliptic and firstorder hyperbolic PDEs will be derived. Finally, we present numerical experiments which highlight the practical application of DGFEMs on meshes consisting of general polytopic elements.