Detach Faces
By detaching, faces are removed from an object (the parent) and are used to form a new object (the child). The wound that results from detaching the faces is healed by either creating new faces based on the surrounding edges or by growing or shrinking adjacent faces.
To open the Tools window for Detach Faces, from the Geometry toolbar, Defeaturing and Repair () menu, select Detach Faces (). You can also right-click the Geometry node and select the same option from the context menu.
Note: When you are in the Tools window for Detach Faces, you can at any time switch to another defeaturing tool by clicking one of the corresponding buttons at the top of the window.
Select the faces you want to detach in the Graphics window. They appear in the Faces to detach list.
The Detach Faces tool can only be applied to objects that are represented by the Parasolid® geometry kernel, also called CAD objects.
The Parent heal method list determines how to replace the detached faces in the parent object: Create capping faces means that a new faces are constructed based on the edges adjacent to each wound, and Extend adjacent faces (default) means that the wound is covered by growing and shrinking the adjacent faces.
The Child heal method list controls how to construct the child solid from the detached faces: Create capping faces means that a new face is formed based on the surrounding edges of each wound, Extend adjacent faces from child means that the detached faces grow or shrink to form a solid, and Extend adjacent faces from parent (default) means that the parent faces surrounding the detached faces grow or shrink to form a solid together with the detached faces.
When you click the Detach Selected button, the program detaches the selected faces and adds a node corresponding to this operation to the geometry branch of the model tree. The Tools window for Detach Faces remains open so that you can continue defeaturing using this or another defeaturing tool.
If you want to modify the performed detach operation, select the added node in the geometry branch. Then edit the node’s form that appears in the Settings window. Click the Build Selected button () to see the result of your edits. The Settings window for Detach Faces contains the additional settings described below.
Selections of Resulting Entities
If you want to make the resulting entities contribute to a cumulative selection, select a cumulative selection from the Contribute to list (the default, None, gives no contribution), or click the New button to create a new cumulative selection (see Cumulative Selections in the COMSOL Multiphysics Reference Manual).
Select the Resulting objects selection check box to create predefined selections (for all levels — objects, domains, boundaries, edges, and points — that are applicable) in subsequent nodes in the geometry sequence. To also make all or one of the types of resulting entities (domains, boundaries, edges, and points) that the resulting objects consist of available as selections in all applicable selection lists (in physics and materials settings, for example), choose an option from the Show in physics list: All levels, Domain selection, Boundary selection, Edge selection, or Point selection. The default is Domain selection, which is suitable for use with materials and physics defined in domains. For use with a boundary condition, for example, choose Boundary selection. These selections do not appear as separate selection nodes in the model tree. Select Off to not make any selection available outside of the geometry sequence.