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math.NA2024
Matrix-free implementation of the non-nested multigrid method
Marco Feder, Luca Heltai, Martin Kronbichler +1
Traditionally, the geometric multigrid method is used with nested levels. However, the construction of a suitable hierarchy for very fine and unstructured grids is, in general, hig…
math.NA2024★ 4 cited
R3MG: R-tree based agglomeration of polytopal grids with applications to multilevel methods
Marco Feder, Andrea Cangiani, Luca Heltai
We present a novel approach to perform agglomeration of polygonal and polyhedral grids based on spatial indices. Agglomeration strategies are a key ingredient in polytopal methods…