Multiple-Cell (fluid) Zone Meshing in Ansys Fluent

- April 6, 2020 at 5:02 am
  
  cfd_learner
  Subscriber
  
  Hi,
  
  I want to create a meshing in Ansys Fluent Meshing using a Watertight geometry workflow for two-fluid regions present in the same geometry. How to do this?
  
  For example a wind turbine rotor inside a moving reference frame and a far-field stationary region outside.
  
  Regards.
- April 6, 2020 at 10:07 am
  
  Rob
  Forum Moderator
  
  You need to label both fluids with different names. I'd also label the bounding surface with "interior-rotating" or similar to make those a named entity. I've not tried it for a few versions so let us know how you get on.
- April 6, 2020 at 10:38 am
  
  cfd_learner
  Subscriber
  
  I labeled as "fluid-static" and "fluid-moving". The problem is how to tackle interfaces between static/moving zones? Whether I have to use "share topology" option or not. Somehow I end up with meshing of one zone only.
- April 6, 2020 at 1:06 pm
  
  Rob
  Forum Moderator
  
  Did you subtract+retain the rotating volume? You'll need to tell Fluent Meshing there are two fluid regions if it doesn't pick them up at the volume meshing stage.
- April 6, 2020 at 1:40 pm
  
  cfd_learner
  Subscriber
  
  How to tell fluent meshing under "watertight geometry workflow"?
- April 6, 2020 at 3:23 pm
  
  cfd_learner
  Subscriber
  
  Somehow, I managed to do multi-region meshing.
  
  Under "Watertight Geometry Workflow", --> Describe Geometry --> Check to YES Apply Share Topology -->Advanced --> Join & Intersect Method -->Join & Intersect..
  
  This way I managed to mesh two fluid zones with interface boundaries.
  
  Now I am stuck with "Periodic Boundaries". Only managed to "Apply Periodic Boundaries" to one pair of a single fluid zone.
  
  Any help regarding this?
- April 6, 2020 at 3:55 pm
  
  Rob
  Forum Moderator
  
  I'll have a look at the enclosed volumes tomorrow: sounds like it's changed since I last tried it.
  
  There shouldn't be any periodic boundaries, the only "odd" ones should be interface zones?
- April 6, 2020 at 4:09 pm
  
  cfd_learner
  Subscriber
  
  Yes, there are interfaces, If I want to simulate only one sector (one blade) with periodic boundaries, then there exists.
- April 7, 2020 at 6:16 am
  
  cfd_learner
  Subscriber
  
  No solution yet for multi-region meshing with interfaces....stuck badly.
  
  The following solution already mentioned also not working.
  
  Under "Watertight Geometry Workflow", --> Describe Geometry --> Check to YES Apply Share Topology -->Advanced --> Join & Intersect Method -->Join & Intersect..