Negative Cell Volume issue on 6DOF Dynamic Mesh

- March 9, 2022 at 5:56 am
  
  ianyylai
  Subscriber
  
  Screenshot 2022-03-08 212325.png
- March 22, 2022 at 9:09 pm
  
  RK
  Ansys Employee
  
  Hello.
  I think you have a conformal mesh and this might cause issue. Make sure you setup a sliding mesh first and then dynamic mesh. Also, make sure the initial mesh is good.
- March 25, 2022 at 3:08 am
  
  ianyylai
  Subscriber
  
  may I ask how do a sliding mesh help with the dynamic mesh situation? Since what I see on youtube tutorials are the people directly using dynamic mesh. And by the initial mesh being good, do you mean the element size does affect Negative Cell Volume issue?
- March 25, 2022 at 11:22 am
  
  Rob
  Ansys Employee
  
  Are you trying to model a rotor that simply spins and doesn't deform? If so, and it's in a cylinder have a look at sliding mesh in Fluent.
- March 27, 2022 at 12:16 am
  
  ianyylai
  Subscriber
  
  I am trying to model a rotor that spins and doesn't deform, yes. Thanks.
- March 28, 2022 at 2:09 pm
  
  Rob
  Ansys Employee
  
  OK, I'd be looking at sliding mesh. In that case we move a mesh zone but don't change the cell shape. It's computationally more efficient.
- March 29, 2022 at 11:00 pm
  
  ianyylai
  Subscriber
  
  That's great. But does sliding mesh work for all geometry? Since my model may be containing some small curvatures and complicated interfaces. Is there any rule of thumbs saying what situations would sliding mesh / dynamic mesh be performing better?

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