Vertex-patch smoothers with approximate fast-diagonalized local solvers give a fast, mesh-uniform multigrid method for C0 interior penalty discretizations of the biharmonic equation on Cartesian meshes.
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Tensor-product vertex patch smoothers for biharmonic problems
Vertex-patch smoothers with approximate fast-diagonalized local solvers give a fast, mesh-uniform multigrid method for C0 interior penalty discretizations of the biharmonic equation on Cartesian meshes.