A low-order refined finite element mesh with ordered ILU-smoothed geometric multigrid and overlapping additive Schwarz yields matrix-free preconditioners whose iteration counts stay bounded in h, polynomial degree p, and DG penalty parameter eta.
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Efficient low-order refined preconditioners for high-order matrix-free continuous and discontinuous Galerkin methods
A low-order refined finite element mesh with ordered ILU-smoothed geometric multigrid and overlapping additive Schwarz yields matrix-free preconditioners whose iteration counts stay bounded in h, polynomial degree p, and DG penalty parameter eta.