The methodology proposed in this paper bridges the gap between entropy stable and positivitypreserving discontinuous Galerkin (DG) methods for nonlinear hyperbolic problems. The entropy stability property and, optionally, preservation of local bounds for cell averages are enforced using flux limiters based on entropy conditions and discrete maximum principles, respectively. Entropy production by the (limited) gradients of the piecewise-linear DG approximation is constrained using Rusanov-type entropy viscosity. The Taylor basis representation of the entropy stabilization term reveals that it penalizes the solution gradients in a manner similar to slope limiting and requires implicit treatment to avoid severe time step restrictions. The optional application of a vertex-based slope limiter constrains the DG solution to be bounded by local maxima and minima of the cell averages. Numerical studies are performed for two scalar two-dimensional test problems with nonlinear and nonconvex flux functions.
|Original language||English (US)|
|Journal||Journal of Numerical Mathematics|
|State||Published - Dec 2 2021|
Bibliographical noteKAUST Repository Item: Exported on 2022-06-21
Acknowledgements: This research was supported by the German Research Association (DFG) under grant KU 1530/23-1. The author would like to thank Manuel Quezada de Luna (KAUST) and Hennes Hajduk (TU Dortmund University) for inspiring discussions of the presented methodology.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
ASJC Scopus subject areas
- Computational Mathematics