Unstructured Grids (UG) is an add-on for Blender 2.80 (or a later version) for creating, importing, editing and exporting of 3D volume meshes composed of arbitrary polyhedron cells (a.k.a 3D unstructured grids). The motivation for this work was the lack of open source volume mesh editors. There are numerous finite volume mesh generators, but practically no general or visual editors.
Add-on handles mesh topology and geometry (the definition of cells). Field data (cell data or point data) for the mesh is disregarded. Editing includes tasks like moving of selected vertices, deletion of existing cells, extrusion of new cells, and assignation of selected faces and cells to named boundaries and zones. The user of the add-on is assumed to know Blender modelling and material systems on a basic level.
The add-on has been tested with Blender 2.82a and OpenFOAM Foundation version 7 of OpenFOAM.
Documentation (made using Sphinx) is located in docs directory of the sources and is viewable online at https://unstructured-grids.readthedocs.io.
Please use Github issues for bug reporting. There is also a discussion thread on CFD Online and another one on VTK discourse forum.
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Don't save Unstructured Grid object in blend file to save disk space (mesh is anyways thrown away and regenerated from UG text strings)
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Add Gzip option to OpenFOAM PolyMesh export
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Split Cells (Edge Division) (e.g. hexahedral cell is split to 8 cells, tetrahedral cell is split into 4 cells)
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Dissolve Internal Faces (merge cells)
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Merge Overlapping Boundary Faces (e.g. to merge two mesh regions)
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Separate Internal Faces (convert internal face to two boundary faces)
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Split Cells (Center Slicing) (polyhedron cell face vertices are connected to cell center)
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Show Cells (creates temporary object with faces around selected cells)
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Fix Intersecting Boundaries (move boundary vertices so that boundary faces don't intersect each other)
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Support for OpenFOAM sets?
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Mesh Quality metrics + operator to select bad cells. Definition of bad cells depend on target simulation type, so there would need to be several metrics. This would be nice-to-have but not essential, since it is possible to use checkMesh utility of OpenFOAM, or e.g. Mesh Quality filter in Paraview or e.g. BVTKNodes to evaluate mesh quality.
This offering is not approved or endorsed by OpenCFD Limited, producer and distributor of the OpenFOAM software via www.openfoam.com, and owner of the OPENFOAM® and OpenCFD® trade marks.