What is the meaning of “APEX”, “BASE”, “BASE_EPI$”, etc. in Deformed Coordinates 1-3?
These are labels and are matched with the labels defined in the nodes form. $ indicates the end of a label, the underscore is like an AND. In the case of the boundary conditions, these labels are treated as the list of nodes that comprise the named regions. You can use the node form to assign any label you like to one or more nodes. Please see below for more information on labels and regular expressions.
