General Mechanical

General Mechanical

ANSYS rotordynamics with general axisymmetric elements

    • Ethan Perez
      Subscriber

      I am using ANSYS 2021 R2 and would like to run a modal analysis (rotordynamics) in Mechanical with general axisymmetric elements. I am using Workbench to link a Geometry (Spaceclaim) to a Mechanical Model and finally to a Modal analysis. With this approach I am unable to select general axisymmetric unless beta options are activated. However I can select general axisymmetric when my Mechanical Model is linked to a Static Structural analysis. Are general axisymmetric elements not supported by Mechanical modal analysis?

    • Sheldon Imaoka
      Ansys Employee

      Hi Ethan,

      You're correct that General Axisymmetric is currently for static structural analyses only (this is noted in the Ansys documentation, under the "General Axisymmetric Overview" section of the Mechanical help).

      For modal and other analyses, it may run with beta features turned on, but please exercise caution and check your results, as beta features are not fully supported or tested.

      An alternative is to model the parts with a combination of beam, lumped mass, shell, or solid elements.  This can increase the DOF count depending on the model, but it's worth noting that for the general axisymmetric elements, you often need several nodal planes to accurately capture the bending response, anyway, so that results in higher DOF count for general axisymmetric models.  (The beam and lumped mass approach of modeling is the most computationally efficient.)

      Regards,
      Sheldon

       

    • Ethan Perez
      Subscriber

      Hi Sheldon,

      Thank you for the response. Yes I did notice that in the documentation and was interested in finding out more about the limitation. Are there any plans to fully support general axisymmetric elements in modal analysis?

    • Sheldon Imaoka
      Ansys Employee

      Hi Ethan,

      This feature request is in the pipeline, but I don't have any specific dates or other information I can share with you, unfortunately.

      Regards,
      Sheldon

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