Structure-Preserving Discontinuous Galerkin Methods for Stochastic Shallow Water Equations
This work provides a stable and accurate numerical method for stochastic shallow water equations, which is important for geophysical and engineering applications with uncertainties.
The authors develop a structure-preserving, entropy conservative, and entropy stable discontinuous Galerkin-stochastic Galerkin method for stochastic shallow water equations, demonstrating accuracy and robustness through numerical experiments.
Shallow water equations (SWE) are fundamental models in fluid dynamics that are essential for studying a wide range of geophysical and engineering phenomena. In many practical applications, uncertainties arising from initial conditions and bottom topography must be taken into account, motivating the development of stable and accurate numerical methods for stochastic SWE. Building on the hyperbolicity-preserving stochastic Galerkin formulation for SWE [Dai, Epshteyn, Narayan, 2021 SISC] and a stochastic extension of the entropy stable discontinuous Galerkin methods for skew-symmetric SWE [Fu, 2022 JSC], we develop a structure-preserving, entropy conservative, and entropy stable discontinuous Galerkin--stochastic Galerkin method for the stochastic shallow water system, with the well-balanced property. We demonstrate the accuracy, applicability, and robustness of the proposed structure-preserving algorithms through several numerical experiments.