Delete Short Edges
Use the Delete Short Edges tool to find edges shorter than a specified length, and then to delete these by collapsing the edges.
Note that this defeaturing tool cannot find short edges on 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.
To open the Tools window for Delete Short Edges, from the Geometry toolbar, Defeaturing and Repair () menu, select Delete Short Edges (). You can also right-click the Geometry node and select the same option from the context menu.
Note: When you are on the Tools window for Delete Short Edges, you can anytime switch to another defeaturing tool by clicking one of the corresponding buttons at the top of the window.
Delete Short Edges
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 Short Edges tool can only be applied to objects that are represented by the Parasolid® geometry kernel, also called CAD objects.
In the field Maximum edge length, enter the maximum length of the edges you want to delete. When you click the Find Short Edges button, a list of edges with length smaller that the given value is shown in the Short edge 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 Short Edges contains the additional settings described below.
To delete all edges returned by the search, set the Deletion type to All short edges. You can delete a subset of the found edges by selecting them in the Short edge selection list, and choosing Selected short edges 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.