In the Clearance tab, you can define an initial clearance value and a contact
direction for a contact pair.
The Contact Manager can only be used to create a clearance definition for contact
pairs that have one master-slave pair. If a contact pair has more than one
master-slave pairs, then clearance has to be defined for each master-slave pair in
the Entity Editor or in the Interfaces panel.
The Clearance tab is enabled when a master and slave surface are selected in the
Define tab, and the Small sliding and Clearance check boxes are selected in the
Parameter tab.