Add `hypre_MGRSetGlobalSmootherAtLevel` to MGR

hypre-space / hypre

Parallel solvers for sparse linear systems featuring multigrid methods.

https://www.llnl.gov/casc/hypre/

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Closed victorapm closed 2 months ago

victorapm commented 3 months ago

Add hypre_MGRSetGlobalSmootherAtLevel which allows users to set "external" hypre solvers as a global relaxation method in MGR.

Tests: