Check
To check the validity of CAD objects, from the Geometry toolbar, Defeaturing and Repair () menu, select Check ().
Select the objects that you want to check in the Graphics window. These then appear in the Input objects list. If the geometry sequence includes user-defined selections above the Check node, choose Manual to select objects, or choose one of the selection nodes from the list next to Input objects. Click the Active button to toggle between turning ON and OFF the Input objects selections.
If any problems are detected in the selected objects when building this feature, warning nodes appear with details about the issues. In the warning nodes use the Zoom to Selection button next to the Entities list to locate the faulty edges or faces.
Warnings on geometric entities are usually associated with objects imported from CAD files, but could also be introduced by geometric operations, for example when repairing an object with a tolerance that is too large. The presence of warnings does not generally mean that the geometry is invalid and cannot be used for setting up a simulation. However, the faulty entities may in some cases cause the failure of geometric operations that involve these entities, and meshing of entities with certain types of faults may fail. In the following you can read about two commonly occurring class of faulty geometric entities, and how to repair these:
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Tolerance issues: The warning messages vertex not on edge, vertex not on face, edge not on face belong to this category. These type of faults indicate that the topology (structure) of the object is not correct locally, for example that an edge is not located on the boundary where it is expected to be. You can often repair tolerance issues in an object by applying the Repair operation with a tolerance that is larger than the tolerance used for the import. Repair adjusts the tolerance of the entities where required, and, if this fixes the issues, warning nodes will not be displayed after the Repair node. In some cases it may also help to use the option Simplify curves and surfaces for the Repair operation. Note that increasing the repair tolerance too much may lead to removing important details from the geometry. As an alternative to the Repair operation you can also reimport the CAD file using a larger tolerance, however the option to simplify curves and surfaces is not available in this case. For more details see Repair, and Import Options.
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Invalid entities: The warning messages invalid curve or surface, self-intersecting face, face-to-face inconsistency, self-intersecting curve or surface signify invalid entities. If you encounter any of these faults after importing a geometry from a CAD file you may need to repair the geometry to avoid problems with meshing. For example:
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For face-to-face inconsistency faults on solid objects, try to repair the object using the Repair face-to-face inconsistencies in solids option for the Repair feature.
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Try to replace the faulty face. Use the Delete operation to delete the face, then use the Cap Faces operation to generate a new face in its place. Another solution may be to use Delete Faces to delete and patch in one operation several connected faces that have a fault.