The Prescribed Displacement/Rotation subnode can be used to selectively constrain or prescribe degrees the of freedom of a Rigid Domain:
Select the Offset check box to add an optional offset vector to the definition of the center of rotation. Enter values for the offset vector
Xoffset.
Select one or several of the Prescribed in x direction,
Prescribed in y direction, and
Prescribed in z direction (3D components only) check boxes. Then enter a value or expression for
u0x,
u0y, and
u0z (3D components).
Select Evaluate reaction forces to compute the reaction force caused by the prescribed motion. The default is to not compute the reaction force. When selected, the prescribed motion is implemented as a weak constraint.
Select Apply reaction only on rigid body variables to use a unidirectional constraint for enforcing the prescribed motion. The default is that bidirectional constraints are used. This setting is useful in a situation where a bidirectional constraint would give an unwanted coupling in the equations. This would happen if the prescribed value of the motion is a variable solved for in other equations.
Physics tab with Rigid Domain node selected in the model tree: