FSI

- July 26, 2019 at 7:07 am
  
  Shuvadeep
  Subscriber
  
  I am trying to simulate a coupled analysis between Fluent and Transient structural. The structure should rotate about z-axis and update this rotation in Fluent to calculate the fluid forces and moments. This forces should in turn be updated in structural and so on.
  
  The structural rotation doesn't update in Fluent and the solution runs without any errors. However when I open CFD Post, the FF system of Fluent doesn't have any structural rotation and computes the flow field in the initial orientation only. But the SYS shows the structure has rotated through certain degrees. Why is this happening?
- July 26, 2019 at 1:35 pm
  
  Rob
  Ansys Employee
  
  Not sure about the FSI interaction, but why not just use a UDF to put a force on the blades/hub to restrict motion and do it all in Fluent? I assume you've set Fluent so that zone can rotate?
- July 26, 2019 at 3:19 pm
  
  Shuvadeep
  Subscriber
  
  Can you help me with the udf?
  
  the motion is purely rotational about z-axis following the equation of motion as in the picture. M is the moment of the previous time step about the z-axis due to fluid forces. the theta is the rotation angle about z-axis.

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