The Normal Velocity condition adds a source specified in terms of an inward normal velocity
vn(
t) or velocity
v0(
t) of the boundary. The component in the normal direction is used to define the boundary condition. This feature represents an external source term like a vibrating surface. The condition is also available from the
Pairs submenu, as an option at interfaces between parts in an assembly. This effectively introduces a condition similar to the
Interior Normal Velocity but used on an assembly.