Implement an iterative Poisson solver#69
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pbartholomew08 wants to merge 132 commits intoxcompact3d:mainfrom
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Implement an iterative Poisson solver#69pbartholomew08 wants to merge 132 commits intoxcompact3d:mainfrom
pbartholomew08 wants to merge 132 commits intoxcompact3d:mainfrom
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This will disable iterative solver support
The high-order operator is implemented entirely in x3d2 code, the low-order (preconditioner) requires PETSc - therefore we should at least ensure the high-order operator is always tested
Currently this only supports BC_PERIODIC (however in principle any should be supported)
A few odd indentation results we killed - potentially due to long lines
The CG/petsc implementation needs rewritten follwing this structure
…hen-it-reorders' into 44-poisson-solver-iterative-solver
Restoring the 7-point preconditioner appears effective in MGCG
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This is based off the Poisson branch #32 and adds the interface to PETSc as an alternative Poisson solver.