Unfortunately, when I toggle the deformable skull to rigid using *DEFORMABLE_TO_RIGID_INERTIA, then LS-DYNA appears to still consider that part as deformable in the *BOUNDARY_PRESCRIBED_MOTION_RIGID and therefore I get an error message that the part assigned is not rigid.
My intial idea of defining a CNRB is compatible with using *BOUNDARY_PRESCRIBED_MOTION_RIGID, but unofrtunatley LS-DYNA appears to neglect the imposed CG using the intertia feature despite the manual says if should use what imposed manually. Maybe something to consider in the next debugging of the LS-DYNA code by Ansys?
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