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• W2980093786 endingPage "109010" @default.
• W2980093786 startingPage "109010" @default.
• W2980093786 abstract "We propose IMEX HDG-DG schemes for planar and spherical shallow water systems. Of interest is subcritical flow, where the speed of the gravity wave is faster than that of nonlinear advection. In order to simulate these flows efficiently, we split the governing system into a stiff part describing the gravity wave and a non-stiff part associated with nonlinear advection. The former is discretized implicitly with the HDG method while an explicit Runge-Kutta DG discretization is employed for the latter. The proposed IMEX HDG-DG framework: 1) facilitates high-order solutions both in time and space; 2) avoids overly small time-step sizes; 3) requires only one linear system solve per time stage; 4) relative to DG generates smaller and sparser linear systems while promoting further parallelism; and 5) suppresses the fast modes in the system with a large time-step size. Numerical results for various test cases demonstrate that our methods are beneficial for applications where non-stiff terms are accurately treated while stiff terms are less accurately handled." @default.
• W2980093786 created "2019-10-18" @default.
• W2980093786 creator A5008274019 @default.
• W2980093786 creator A5023021268 @default.
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• W2980093786 date "2020-01-01" @default.
• W2980093786 modified "2023-09-27" @default.
• W2980093786 title "IMEX HDG-DG: A coupled implicit hybridized discontinuous Galerkin and explicit discontinuous Galerkin approach for shallow water systems" @default.
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• W2980093786 doi "https://doi.org/10.1016/j.jcp.2019.109010" @default.
• W2980093786 hasPublicationYear "2020" @default.
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