A discontinuous Galerkin extension of the vertex-centered edge-based finite volume method

Abstract. The finite volume (FV) method is the dominating discretization technique for computational fluid dynamics (CFD), particularly in the case of compressible flu-ids. The discontinuous Galerkin (DG) method has emerged as a promising high-accuracy alternative. The standard DGmethod reduces to a cell-centered FVmethod 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 re-duces 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 discretiza-tion to encompass higher accuracy through the new DG method