'neigh' <set> <tol>
This keyword is used to find neighboring element faces which can be used in a *TIE or *CONTACT PAIR formulation. It will search for disjunct meshes and generates sets storing the faces of this meshes with setnames starting with '+CF'. The close faces are stored in sets which reference this meshes. For example:
The first part of the name references the set containing the faces, the second references the neighbor.