Generalized FMG hierarchy: custom-P transfers for arbitrary nested/non-nested grids (Layer 1)#290

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lmoresi merged 16 commits into

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feature/custom-mg-prolongation

Jul 2, 2026

Commits on Jun 28, 2026

feat(solvers): custom geometric-MG prolongation hook (scalar)
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feat(custom_mg): Layer-1 generalized FMG hierarchy (BC-per-level) + scoped SBR
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docs(custom_mg): Layer-1 status + remaining hardening before merge
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Commits on Jun 29, 2026

feat(custom_mg): Stokes velocity-block custom-P FMG (Phase 1, Step 1)
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docs(custom_mg): mark Stokes velocity-block integration done (Phase 1, Step 1)
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refactor(custom_mg): drop level_solver_factory (Phase 1, Step 2)
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docs(custom_mg): mark factory removal done (Phase 1, Step 2)
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feat(custom_mg): loud serial-only guard for np>1 (Phase 1, Step 3 partial)
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docs(custom_mg): record np>1 serial guard (Phase 1, Step 3)
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feat(custom_mg): parallel (np>1) custom-P FMG, nested co-partitioned (Phase 1, Step 3)
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docs(custom_mg): record parallel np>1 done (Phase 1, Step 3)
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feat(custom_mg): cover all solver families (SNES_Vector hook; Vector + Constrained tests)
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docs(custom_mg): solver-family coverage matrix + constrained-parallel limitation
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docs(custom_mg): link constrained-parallel segfault to issue #291
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fix(custom_mg): wire assembled Jacobian into KSP before velocity-block fieldsplit
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Commits on Jul 2, 2026

fix(custom_mg): address Copilot review — PetscInt CSR indices, solve not inv
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