Fill Holes
Use a Fill Holes node () to repair an imported 3D surface mesh that might have minor holes.
Note that filling holes in the mesh can modify the number of geometric boundaries in the mesh. Thus, when you add this operation to a meshing sequence that conforms with the component’s geometry, a new meshing sequence that defines its own geometric model is automatically created, and the Fill Holes node is added to this new sequence. For more information see The Mesh Node.
To fill holes in surface meshes, select one or more boundaries, then:
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Right-click in the Graphics window, and select Fill Holes from the Cleanup and Repair menu. For more information, see The Graphics Context Menu.
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In the Mesh toolbar, click Cleanup and Repair () and choose Fill Holes.
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Right-click the Mesh node and choose Fill Holes from the Cleanup and Repair menu.
Enter the properties for the Fill Holes node using the following sections:
Boundary Selection
The operation to fill a hole requires a face (boundaries) selection and finds holes in and between all selected faces. Only faces isolated in void or unmeshed domains can be selected.
Fill Holes
Holes that have a perimeter less than the tolerance are filled. You specify the tolerance using the Maximum hole perimeter list:
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Select Automatic (the default) to use a tolerance that is 10 times the mean element size of the imported mesh.
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Select Manual to specify the tolerance (SI unit: m) in the Perimeter field.
The Join with selected boundaries check box is selected by default. If selected, the created mesh elements (triangles) that fill the hole are added to the surrounding face. If you clear this check box, or if the hole is adjacent to more than one face, the created mesh elements form a new face.
Select the Create domains check box (selected by default) to automatically form domains for each (connected) finite void region that is defined by the imported surface mesh and analyze these domains with respect to the mesh that may already exist in the sequence. Clear the check box to not form domains, for example if more repairing is needed before the mesh forms watertight regions. Consider to later add a Create Domains operation if you clear the check box.
Most physics require a mesh on the domains. Use the Free Tetrahedral, Swept, and Boundary Layers operations to fill the domains with domain elements.
See STL Import 2 — Remeshing an Imported Mesh: Application Library path COMSOL_Multiphysics/Meshing_Tutorials/stl_vertebra_mesh_import.
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Create Faces
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Create Domains
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Remeshing Imported Meshes
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Information, Warning, and Error Nodes