The array smsg (sub message) is a one dimensional array which stores the virtual unknowns for a certain sub face. The type of the virtual unknowns is determined by the itrans parameter. The sub message smsg is manipulated by the routines isddput , isddget , isddvput , isddvget . To describe smsg consider as an example the second sub face of the following lower boundary of a block in Fig. 11.
Figure 11: Unknowns stored in a multi-block sub message
An itrans variable determines the contents of smsg:
