Delete Holes
Use this defeaturing tool to search for and delete cylindrical holes from an object. The tool can find and delete both through or blind holes on solid as well as surface objects. The faces forming the hole are deleted and the resulting wound is covered by extending the adjacent faces.
Note that holes found on nonmanifold objects are not possible to delete. An example of a nonmanifold object is an object with several domains. Such an object can for example result from a Union or a Partition operation. To remove the holes make sure to defeature the geometry objects before applying Boolean operations that result in nonmanifold objects.
To open the Tools window for Delete Holes, from the Geometry toolbar, Defeaturing and Repair () menu, select Delete Holes (). 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 Delete Holes, you can at any time switch to another defeaturing tool by clicking one of the corresponding buttons at the top of the window.
Delete Holes
Activate the Input objects selection by clicking the Active button to toggle between and . Select the objects you want to examine in the Graphics window. They appear in the Input objects list.
The Delete Holes tool can only be applied to objects that are represented by the CAD kernel; see Converting Objects to CAD Kernel Representation.
In the fields Minimum hole radius and Maximum hole radius, enter the size of the holes you want to search for. When you click the Find Holes button, a list of holes with radii between the given values is shown in the Hole selection list.
To delete the found details, either click the Delete All button, or select a subset of the found details in the list and click Delete Selected. Then, the selected details are deleted from their objects, and a node corresponding to this operation is added to the geometry branch of the model tree.
If you want to modify the performed deletion operation, you can 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 Delete Holes contains the additional settings described below.
To delete all holes returned by the search, set the Deletion type to All holes. You can delete a subset of the found holes by selecting them in the Hole selection list, and choosing Selected holes in the Deletion type list.
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.