A projection-prolongation mesh-based filter lets explicit RKDG methods on spherical-polar meshes run with the larger time steps of an auxiliary merged mesh, with a 1D equivalence proof and 2D/3D demonstrations.
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Mesh-Based Filtering to Alleviate Time-Step Restrictions in Runge--Kutta Discontinuous Galerkin Methods in Spherical-polar Coordinates: Application to the Euler Equations
A projection-prolongation mesh-based filter lets explicit RKDG methods on spherical-polar meshes run with the larger time steps of an auxiliary merged mesh, with a 1D equivalence proof and 2D/3D demonstrations.