Multiple periodicity definitions are detected.

- February 26, 2023 at 12:33 pm
  
  Kin Wing Wong
  Subscriber
  
  In FLUENT meshing, I can generate mesh with a single periodicity condition. When it comes to multiple periodicity, the auto-meshing of the volume mesh gives an error,
  Error: Multiple periodicity definitions are detected. You can only perform auto meshing
  with a single periodic boundary definition.
  Error Object: #f
  Is there a workaround to define multiple periodicity to have perfectly mapped mesh on both periodic surfaces?
- February 27, 2023 at 1:34 pm
  
  Federico
  Ansys Employee
  
  Hello, Multiple periodicity can be enabled by inserting a Custom Journal task in the Watertight geometry workflow. Here's a sample of the commands to enter: (define source-id 47) (define target-id 48) (ti-set-size-field-periodicity "translational" '(0 25 0)) (ti-menu-load-string (format #f "~%/boundary recover-periodic-surfaces translational auto ~a ," source-id)) (define source-id 49) (define target-id 50) (ti-set-size-field-periodicity "translational" '(-30 0 -30)) (ti-menu-load-string (format #f "~%/boundary recover-periodic-surfaces translational auto ~a ," source-id)) (enable-feature 'allow-multiple-periodicity) Note that you will need to find the corresponding source/target ids for the corresponding faces in your setup and define the appropriate periodicity. The example above has 2 translational periodicity with vectors (0 25 0) and (-30 0 -30). I hope this helps! Federico
- January 17, 2024 at 8:31 am
  
  itorrano
  Subscriber
  
  Hello Federico,
  I am successfully appling your scheme journal to create multiple periodic zones. But in may case the problem comes when creating the auto mesh. The following message appears:
  Error: CAR: invalid argument [1]: wrong type [not a pair]
  Error Object: ()
  Error: Auto mesh failed.
  Error Object: #f
  Do you know what can be happening? Thanks in advance for your time.