Fully discrete multi-entropy-stable compact Runge--Kutta discontinuous Galerkin methods for hyperbolic conservation laws

Abstract

We develop fully discrete multi-entropy-stable high-order compact Runge--Kutta discontinuous Galerkin (cRKDG) methods for hyperbolic conservation laws. Our main result is a weak cell entropy inequality for multi-dimensional systems after one full high-order Runge--Kutta (RK) time step. The proof exploits the cell-local intermediate stages of cRKDG: their perturbations are controlled by the initial in-cell variation. The analysis does not require a strong stability preserving decomposition or stagewise entropy correction. For a sufficiently dissipative Lax--Friedrichs flux and explicit RK methods with nonnegative output weights, the inequality holds under a suitable time-step restriction for strongly convex entropy pairs. For a prescribed, uniformly conditioned family of such entropies, common dissipation and time-step conditions ensure weak cell entropy stability for all entropy pairs. A single cell-average-preserving scaling at the end of each step then enforces all corresponding strong cell entropy inequalities simultaneously. We also prove a Lax--Wendroff-type theorem: under the stated assumptions, any strongly convergent sequence of numerical solutions converges to a weak solution satisfying all prescribed entropy inequalities. Numerical experiments in one and two dimensions demonstrate high-order accuracy, the benefit of multiple entropy constraints for nonconvex scalar problems, and robust performance on shock problems.