New Paper ‘On the robustness of high-order upwind summation-by-parts methods for nonlinear conservation laws’ published in the Journal of Computational Physics

The paper On the robustness of high-order upwind summation-by-parts methods for nonlinear conservation laws of Andrew R. Winters, Michael Schlottke-Lakemper, Philipp Öffner, Jan Glaubitz, Gregor J. Gassner, and me has been published in the Journal of Computational Physics.

We use the framework of upwind summation-by-parts (SBP) operators developed by Mattsson (2017, doi: 10.1016/j.jcp.2017.01.042) and study different flux vector splittings in this context. To do so, we introduce discontinuous-Galerkin-like interface terms for multi-block upwind SBP methods applied to nonlinear conservation laws. We investigate the behavior of the upwind SBP methods for flux vector splittings of varying complexity on Cartesian as well as unstructured curvilinear multi-block meshes. Moreover, we analyze the local linear/energy stability of these methods following Gassner, Svärd, and Hindenlang (2022, doi: 10.1007/s10915-021-01720-8). Finally, we investigate the robustness of upwind SBP methods for challenging examples of shock-free flows of the compressible Euler equations such as a Kelvin-Helmholtz instability and the inviscid Taylor-Green vortex.

The reproducibility repository is available on GitHub.

As usual, you can find the preprint on arXiv.