Contact matches enable you to match mesh nodes between topologically disconnected solids within a specified tolerance. They are an alternate option to imprinting faces (for example, by using the DesignModeler application). Geometry tolerances are typically tighter than the tolerances used by contact matches, which can lead to problems in obtaining conformal mesh. In these scenarios, contact matches provide a more robust option.
Similar to mesh connections, contact matches are performed on mesh nodes. Contact matches can only be face-to-face between solid bodies.
Contact matches are a post-mesh operation, performed after the base mesh has been generated. The base mesh is then stored so that if you change a contact match, only local re-meshing is required to clean up the neighboring mesh. Likewise, if you make any changes to the base mesh, the contact matches must be re-generated.