shrinking of a tube

- September 20, 2018 at 10:27 am
  
  ft19
  Subscriber
  
  hello everyone,
  
  I'm trying to shrink this 3D cylinder in fluent:
  
  I would like a complete closure of the cylinder maintaining the same thickness. Do you have some suggestion for the dynamic mesh?
- September 21, 2018 at 9:06 pm
  
  mli
  Ansys Employee
  
  Please provide more details of your questions.
- September 24, 2018 at 9:28 am
  
  ft19
  Subscriber
  
  I want to simulate this along all the shape of the tube:
  
  i would like to pass from the design 1 to the design 2 and then again to design 1
- September 24, 2018 at 9:48 am
  
  Rob
  Forum Moderator
  
  Yes, that's possible. Have a read through of the Moving Mesh section of the Fluent manual, I think you're looking at rigid body motion and remeshing. Note, the inner diameter cannot become zero as you must maintain the same topology.
  
  You will probably need a full tet mesh, and I'd suggest refining the mesh.
- September 24, 2018 at 9:49 am
  
  Rob
  Forum Moderator
  
  It may also be possible to use layering in 2d axi-symmetric which would be much quicker depending on the rest of the model.
- September 24, 2018 at 2:58 pm
  
  ft19
  Subscriber
  
  thanks a lot for the answer but can you explain to me what I need to set inside the dynamic mesh and the boundary condition? Because my setting doesn't work and displays "not found zones face" or " negative volume" and I cannot understand why!
  
  thank you so much!