Mesh motion options such as Specified Displacement may be applied on multiple boundary and subdomain regions. Because the specified motion is applied directly to mesh nodes, rather than control volume integration points, care is required to ensure that motion specified on adjacent regions is self-consistent. For example, the motion specified on one moving wall should be reduced to zero for any nodes that are shared with another stationary wall. If this is not done, then the motion applied to the shared nodes will be either the moving or stationary condition, depending on which was applied last during the equation assembly process.

Folded meshes often result from the application of inconsistent motion specifications.