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Hello, I have a problem with a linear static analysis with Optistruct; I have to evaluate shear tension on a rotating cylinder with angular acceleration. I've completed the tutorial on the rotating disc; I've also add angular acceleration in RACC field of RFORCE and results are in accordance with analytical formulas. My problem consist in the evaluation of stress in a rotating cylinder (without the central hole) with angular acceleration. I have no problem if RACC =0 and non-zero angular velocity; however, when I add angular acceleration, resultant displacements are very high and stress very low. Did I commit any errors in constraints definition? I constrained DOF 1 2 3 of nodes belonging to the axis of the cylinder. Thank you so much for your attention rotating.fem