I want to set up the situation as shown below, where the left end face rotates around the CP-Aft and the right end face does the same. It's a matter of rotating around a local co-ordinate system, as my origin is in the middle of the model shown in the picture. And I want to set a constant rotation speed, what keyword should I use?
Before I started this topic, I have tried the following keywords: 1. BOUNDARY_PRESCRIBED_MOTION, but it can only be used in the global coordinate system; 2. LOAD, which can only set forces and moments, not displacements or velocities; 3. INITIAL_VELOCITY, which can only set the initial velocity, not the constant velocity.
I believe you can try *Boundary_prescribed_motion_rigid_local and make the edges of your part rigid and reference your local coordinate system in the *Mat_Rigid keyword (LCO). You might also be able to make the edges rigid using CNRB (*Constrained_nodal_rigid_body) and assign the local coordinate system there and reference the CNRB in the *boundary card. I cannot remember if LS-Dyna will treat it as a rigid body for motion though.