New Preprint ‘Convergence of entropy-conservative summation-by-parts discretizations to smooth solutions of hyperbolic conservation laws’ on arXiv

Jesse Chan, Raymond Park, Joshua Lampert, Eric Ching, Ayaboe Edoh, and I have published a new preprint Nodal discontinuous {G}alerkin methods for non-ideal equations of state: pressure equilibrium preservation and entropy correction on arXiv.

Structure-preserving discontinuous Galerkin (DG) methods typically improve the robustness of high order simulations of real fluids. In addition to conservation, key structures include the preservation of pressure equilibrium and satisfaction of at least one entropy inequality. In this work, we investigate conservative discretizations using exactly pressure equilibrium conserving (EPEC) and approximately pressure equilibrium conserving (APEC) flux differencing DG formulations, as well as entropy stable formulations through the use of minimally dissipative corrections for non-ideal equations of state (EOS). We introduce an analysis of EPEC schemes and a new procedure for designing such fluxes based on a generalization of Tadmor’s shuffle condition. We also analyze APEC DG schemes and show that the incorporation of dissipative interface penalization terms does not significantly increase pressure equilibrium errors, especially at higher orders of approximation. Finally, we observe that when combined with APEC flux differencing formulations, entropy correction improves robustness for under-resolved solutions and long-time simulations.

The reproducibility repository is available on GitHub and Zenodo.