To open the Tools window for Delete Spikes, from the Geometry toolbar, Defeaturing and Repair () menu, select Delete Spikes (). You can also right-click the Geometry node and select the same option from the context menu.

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. Note that this defeaturing tool cannot find spikes on faces that belong to nonmanifold objects. 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 avoid this situation defeature the geometry objects before applying Boolean operations that result in nonmanifold objects.

In the field Maximum spike width, enter the maximum width of the spikes you want to delete. When you click the Find Spikes button, a list of spikes with width smaller that the given value are shown in the Spike 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 Spikes contains the additional settings described below.

To delete all spikes returned by the search set the Deletion type to All spikes. You can delete a subset of the found spikes by selecting them in the Spike selection list, and choosing Selected spikes in the Deletion type list.

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.