To locate small details, such as short edges and sliver faces, you can add and build a Free Tetrahedral node with normal size settings. Doing this results in warnings with selections that point you to the corresponding small entities. You can also inspect the mesh visually to locate unexpected small elements. See Information, Warning, and Error Nodes for Meshing Operations.
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To split a solid geometry object into parts using an empty Work Plane, place the work plane where you want to cut the domain. Then add a Partition Objects or Partition Domains node from the Boolean Operations submenu, and select Work plane from the Partition with list in the Settings window for Partition.
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For a tutorial on how to edit the mesh size parameters, see
Adjusting the Element Size for the Unstructured Mesh Generator: Application Library path COMSOL_Multiphysics/Meshing_Tutorials/piston_mesh. In Introduction to the CAD Import Module:
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