Ansys Fluent – Solid wall rotation problem

- September 30, 2019 at 7:36 pm
  
  Cosm0
  Subscriber
  
  Hi all
  I am using ANSYS Fluent to simulate the rotation of a drum (made of titanium as external walls) and filled with water (so basically a rotating cilynder with a water volume inside and a titanium volume outside).
  I 'm having though problems in the rotation settings of the solid external part: after having set the liquid solid interfaces between titanium walls and water volume, in the "setup" when I try to apply the rotational velocity to the solid walls the only way I can do this is to activate the "frame motion" in the solid body (under cell zone conditions) imposing a rotational velocity of 63 rad/s. While in the boundary conditions section, the "momentum" of the solid wall boundary is not active (since it's solid).
  
  But doing this way I noticed that the titanium walls don't rotate, I tried with different settings (making also the water wall boundary rotating), setting the same rotational velocity to the interfaces and other methods but I didn't manage to make the solid walls rotate.
  
  Could you please tell me how I could solve this problem and make the solid body rotate?
- November 3, 2019 at 2:34 pm
  
  Cosm0
  Subscriber
  
  Can anyone help me with this question please? Or address me to someone that could solve this problem.
  
  Thank you.
  
  P
- November 4, 2019 at 3:11 pm
  
  Rob
  Forum Moderator
  
  Have you done the reference frame tutorial that comes with the documentation?
- November 8, 2019 at 9:53 am
  
  Cosm0
  Subscriber
  
  Hi,
  
  thank you for your answer.
  
  Yes I did follow the reference frame tutorial, but the problem is that in my case, in the boundary condition "wall" of my solid volume (the external titanium cylinder)
  
  the momentum option is not active. So I cannot set the "wall" setting as "moving wall" instead of "stationary wall". And I think this might be the problem of the non rotation of my solid walls.
  
  I attach here beneath a screenshot of the "wall" setting.
  
  Do you know why the momentum setting is not active for the solid wall?
  
  Thank you in advance.
  
  Best,
  
  P
- October 28, 2020 at 9:11 am
  
  LorenzoMazzei
  Subscriber
  
  Cosm0, you are looking the solid-side of the boundary, therefore there is no momentum. You have to modify the fluid-side boundary.n