New paper in SIAM Journal on Scientific Computing

Boyang Xia and David Moxey have a paper in SIAM Journal on Scientific Computing on evaluating interface fluxes in discontinuous Galerkin spectral element methods. Non-conforming interfaces are one of the real strengths of DG, but if the flux is not evaluated carefully the resulting system matrix can lose symmetry. The paper sets out low-cost, unified approaches for general element shapes on unstructured meshes, together with a matrix-free implementation in Nektar++.