A discontinuous Galerkin extension of the vertex-centered edge-based finite volume method. (English) Zbl 1364.76108

Berggren, Martin; Ekstrom, Sven-Erik; Nordstrom, Jan

Commun. Comput. Phys. 5, No. 2-4, 456-468 (2009).

Summary: The finite volume (FV) method is the dominating discretization technique for computational fluid dynamics (CFD), particularly in the case of compressible fluids. The discontinuous Galerkin (DG) method has emerged as a promising high-accuracy alternative. The standard DG method reduces to a cell-centered FV method at lowest order. However, many of today’s CFD codes use a vertex-centered FV method in which the data structures are edge based. We develop a new DG method that reduces to the vertex-centered FV method at lowest order, and examine here the new scheme for scalar hyperbolic problems. Numerically, the method shows optimal-order accuracy for a smooth linear problem. By applying a basic hp-adaption strategy, the method successfully handles shocks. We also discuss how to extend the FV edge-based data structure to support the new scheme. In this way, it will in principle be possible to extend an existing code employing the vertex-centered and edge-based FV discretization to encompass higher accuracy through the new DG method.

MSC:

76M12	Finite volume methods applied to problems in fluid mechanics
65N08	Finite volume methods for boundary value problems involving PDEs
65N15	Error bounds for boundary value problems involving PDEs

Keywords:

discontinuous Galerkin methods; finite volume methods; dual mesh; vertex-centered; edge-based; CFD

Software:

FUN3D; SuperLU; EDGE; TAU