An Explicit Discontinuous Galerkin Scheme with Divergence Cleaning for Magnetohydrodynamics
The explicit space-time expansion discontinuous Galerkin scheme (Gassner et al., J. Sci. Comp. 34(3):260–286, 2008) is applied for solving ideal and viscous magnetohydrodynamic equations. Based on a Taylor expansion in space and time about the barycenter of each cell at the old time level, this predictor-corrector strategy enables each cell to have its own time step whereas the high order of accuracy in time is retained. Thus, it may significantly speed up computations. The discontinuous Galerkin method together with the local time-stepping algorithm allows for an efficient local sub-cycling for a divergence cleaning using a hyperbolic transport correction (Dedner et al., J. Comput. Phys. 175(2):645–673, 2002). Convergence tests and test problems are performed to challenge the capabilities of the space-time expansion scheme.
Unable to display preview. Download preview PDF.