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grinsfem / grins

Multiphysics Finite Element package built on libMesh
http://grinsfem.github.io
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Add Thermally Coupled GMG Examples #589

Closed bboutkov closed 5 years ago

bboutkov commented 5 years ago

This PR expands the GMG multigrid coverage by adding a new thermally coupled flow example which uses the fixed up solver configuration settings that were part of the changes in libMesh/libmesh#2151; as such this PR requires the bumping of minimum libMesh version to that corresponding to the libMesh PR.

The content here provides a new example that is run twice with the idea of demonstrating broad categories of solver configuration capabilities. The first run uses recursive Schur complement decomposition to solve the coupled problem, while the second run uses a multiplicative fieldsplit variant with GMG to precondition the velocity subblock, and GMG on the thermal convective/diffusive subblock.

Please let me know if there's anything to be improved upon!

pbauman commented 5 years ago

Looks good, thanks. Next we need a script generator for the command line solver options, ha!

bboutkov commented 5 years ago

Next we need a script generator for the command line solver options, ha!

Seriously! These things are already taking up pages and it would get even worse if we start trying to do GMG on the upper/lower components of the Schur complement inversions!