locates elements that share all of their nodes with another element of the same type. Duplicate elements should not exist in an ideal mesh.

For a 3D mesh, all faces on a volumetric element should either be attached to the face of another volumetric element or to a surface element. This function finds the volume elements that violate this restriction. Usually this indicates a hole in the surface mesh. In the case of a 2D mesh, this function finds edges of mesh elements that are not connected to another element or not capped off by a bar (line) element at the perimeter (single or open edges).

The automatic fix will cover these uncovered faces with triangles (surface mesh). This may or may not be the proper solution. A better method may be to first select the flawed elements and then decide if the uncovered faces are the result of missing surface mesh or the result of a hole. If it is due to missing surface mesh, rerun the check and choose the Fix option. If the error points out a hole in the model, you can attempt to correct the mesh by manually creating elements or merging nodes.

Between every two adjacent volume elements that are in different parts there should be a surface element. This function finds the volume elements that violate this restriction. A mesh with only one volume part will not have missing internal faces. For 2D meshes, this function finds two adjacent surface elements in different parts with no line element between them. The automatic fix will create surface or line elements between these elements.

checks surface parts that have periodic faces for inconsistency in the periodicity of the nodes. Errors are reported if periodic matches are missing. Slight offsets in node positions are often repaired automatically during the check process. Remaining errors can be repaired manually using Edit Mesh > Repair Mesh > Make/Remove Periodic.

finds elements where the order of the nodes does not define a right-handed element.

checks for volume elements that share the same surface element. In doing this check, it is required to also check for:

This check will not find elements that occupy the same volume but are attached to regions of mesh that are not connected.

checks for line elements that have one node connected to surface mesh, and the other node free (unconnected).

checks for surface elements that intersect or pass through other surface elements.

checks for bar elements with both nodes unconnected.