How to measure re circulation length of a 3D domain

- July 16, 2020 at 8:47 am
  
  tayyaba.bano
  Subscriber
  
  Hi all,
  
  I hope you are doing well.
  
  My question is how to measure the length of a reticulation region behind a bluff body in 3D.
  
  I am attaching my domain, and I need to calculate the re circulation length behind the bended structure indicated by blue color in the image.
  
  Waiting for the kind response.
  
  Regards
  
  Tayyaba
- July 16, 2020 at 9:11 am
  
  Amine Ben Hadj Ali
  Ansys Employee
  
  Perhaps getting the path length a particle would travel.. Just an idea.
- July 16, 2020 at 10:24 am
  
  tayyaba.bano
  Subscriber
  
  I have calculated the x-distance by considering the change in the direction of velocity vectors (neg to positive ) behind the flap at different locations.
  
  Does it give a correct estimate of the re circulation region?
  
  Regards
  
  Tayyaba
- July 16, 2020 at 2:32 pm
  
  Rob
  Forum Moderator
  
  What criterion are you using to define the flow separation bubble and wake?
- July 17, 2020 at 11:24 am
  
  tayyaba.bano
  Subscriber
  
  Hi,
  
  I am using the velocity vector direction. In my case because of low Reynolds number I don not have a prominent separation bubble but a certain position behind the flap the change in vector direction from neg to positive can be observed.
  
  Regards
  
  Tayyaba