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I am trying to create a model which requires me to rotate a part about a certain point. I am running a dynamic implicit simulation.

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As can be seen in the pic, I have created a ref point and created a kinematic coupling with the part. Now when I rotate the part by applying the BC (disp/rotation or angular vel) at the ref point, I see that the volume of the part increases (Can be seen in the pic )

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The deformation scale factor is set to 1 but still I see this significant increase in volume. I don't understand what is causing it and how do I avoid it. What's the correct way to model it?

enter image description here

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  • Have you constrained the 'z' displacement? It could be moving in z and so look bigger due to perspective. That would be obvious of course if you just rotate the figure. – agentp May 16 '16 at 18:52
  • yeah I have checked that. The boundary condition is applied with 0 displacement for all three directions and the two rotational dofs about x and y axes are also restricted to 0. The only motion applied is rotation about z axis. The volume is seen increasing with only rotation though. When I apply just translational motion, this is not observed. – user5827667 May 16 '16 at 19:43
  • have you specified nonlinear geometry? what quantity are you plotting there? how many increments? – agentp May 17 '16 at 11:45
  • Yeah, I think the issue was with me not specifying the nonlinear geometry. It is working as expected when I specify non linear geom. Thanks – user5827667 May 19 '16 at 04:27

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