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Add MeshUtils submodule with radial refinement rings/center_cell and cell merging#250

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copilot/implement-unstructured-mesh-refinement
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Add MeshUtils submodule with radial refinement rings/center_cell and cell merging#250
Copilot wants to merge 11 commits into
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copilot/implement-unstructured-mesh-refinement

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Copilot AI commented Feb 11, 2026

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Implements mesh refinement and coarsening utilities for UnstructuredMesh: structured radial refinement with concentric rings, cell merging, and moves all mesh manipulation code into a MeshUtils submodule.

MeshUtils submodule

  • Moved refine_mesh from src/meshes/unstructured/refinement.jl into src/meshes/MeshUtils/
  • Backward compatible — all functions remain directly accessible via using Jutul
  • Also available as Jutul.MeshUtils.refine_mesh(...) etc.

refine_mesh_radial — radial refinement with rings and center cell

  • n_rings: concentric ring subdivisions (default 1). Outer rings produce quads, innermost produces triangles to centroid.
  • center_cell: when true, innermost region is a single polygon instead of triangular sectors.
  • n_sectors: minimum angular subdivisions (existing, splits edges at midpoints if needed).
  • Cell count per refined cell: S × R without center cell, S × (R-1) + 1 with.

merge_cells — cell coarsening

  • Merges groups of cells by removing internal faces and cleaning up unused nodes.
  • extra_out=true returns cell_map::Vector{Vector{Int}} mapping new cells → original cells.
  • Works in 2D and 3D.

Example

using Jutul

m = UnstructuredMesh(CartesianMesh((4, 4)))

# Radial: 3 rings with a center cell (9 sub-cells per quad)
m2 = refine_mesh_radial(m, [6, 7, 10, 11]; n_rings = 3, center_cell = true)

# Merge: combine cells back together
m3, info = merge_cells(m, [[1, 2, 5, 6], [3, 4, 7, 8]]; extra_out = true)
info.cell_map  # [[1,2,5,6], [3,4,7,8], [9], [10], ...]

Tests

  • 480 radial refinement tests (volume conservation, normal orientation, cell counts for all parameter combinations)
  • 102 merge_cells tests (2D/3D, multi-group, cell_map correctness)
  • All 1520 existing refine_mesh tests unchanged and passing

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Copilot AI and others added 3 commits February 11, 2026 14:06
Co-authored-by: moyner <454871+moyner@users.noreply.github.com>
Co-authored-by: moyner <454871+moyner@users.noreply.github.com>
Co-authored-by: moyner <454871+moyner@users.noreply.github.com>
Copilot AI changed the title [WIP] Implement refinement for UnstructuredMesh with connectivity Implement refine_mesh for UnstructuredMesh (2D/3D) Feb 11, 2026
Copilot AI requested a review from moyner February 11, 2026 14:22
Copilot AI and others added 2 commits February 11, 2026 15:21
… composition

Co-authored-by: moyner <454871+moyner@users.noreply.github.com>
Co-authored-by: moyner <454871+moyner@users.noreply.github.com>
Copilot AI changed the title Implement refine_mesh for UnstructuredMesh (2D/3D) Support tuple factors, higher refinement, and cell map composition in refine_mesh Feb 11, 2026
@moyner moyner marked this pull request as ready for review February 13, 2026 13:11
Copilot AI and others added 3 commits February 13, 2026 13:30
…rge_cells

Co-authored-by: moyner <454871+moyner@users.noreply.github.com>
Co-authored-by: moyner <454871+moyner@users.noreply.github.com>
Co-authored-by: moyner <454871+moyner@users.noreply.github.com>
Copilot AI changed the title Support tuple factors, higher refinement, and cell map composition in refine_mesh Add MeshUtils submodule with radial refinement and cell merging Feb 13, 2026
Copilot AI and others added 2 commits February 13, 2026 14:16
Co-authored-by: moyner <454871+moyner@users.noreply.github.com>
Co-authored-by: moyner <454871+moyner@users.noreply.github.com>
Copilot AI changed the title Add MeshUtils submodule with radial refinement and cell merging Add MeshUtils submodule with radial refinement rings/center_cell and cell merging Feb 13, 2026
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2 participants