The Continuity node can be added to pair boundaries. It prescribes that the flow and temperature fields are continuous across the boundary. Flow characteristics at the boundary, described in Plane Wave Analysis of Inviscid Flow, are utilized to implement the continuity of the flow and temperature fields. When added to pair boundaries, the Continuity feature is applicable where the boundaries match, that is, when the source boundary has a corresponding destination boundary and vice-versa. Elsewhere in the pair boundaries, the Fallback feature is activated.

If this node is selected from the Pairs menu, choose the pair to apply this condition to. A pair must be created first. See Identity and Contact Pairs in the COMSOL Multiphysics Reference Manual for more details.