General Mechanical

General Mechanical

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Rotational velocity in static structural

    • Seonghun Jeong
      I have a question about using rotational velocity in a static structure.
      First of all, I have attached a simplified structure of the project I am working on.
      As you can see, the center part is rotating at 24rpm, the outer body is not rotating.
      I have applied a 'fixed support' to the bottom, standard earth gravity and a rotational velocity of 24rpm to the rotating part.
      What I want to know is the stress value of the object due to the rotational velocity.
      To check this, I divided it into case 1 and 2.
      1 is a model with only gravity acceleration, and 2 is a model with gravity + rotational velocity.
      When I analyzed the results, the stresses were almost the same.
      I wonder why this is.
      I think the rotation speed of 24rpm is too small to affect the stress, is that correct? 
      Or am I using the rotation speed function incorrectly?
      I'd be grateful for a response. thank you.
    • Nanda Veralla
      Ansys Employee


      Hello Seonghun,

      I would setup this in transient structural and additionally I would use a remote displacement on the bottom face of the rotating rod and make sure to keep the longitudinal axis of rotating rod free, remaining DOF fixed. This should give you the results you’re looking for. Let us know, if this doesn’t help. For more information on Transient structural, follow this link:

      Chapter 5: Transient Dynamic Analysis (



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    • Nanda Veralla
      Ansys Employee

      Hello Seonghun,

      I did a sample run similar to your workflow. There was a minute difference in stress values, they are not the same. When I scale the rpm by a factor of 10, we can see a significant difference in stress values with and without rotational velocity. What are the contact definitions you've given in your model?

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