Normal Velocity

- June 21, 2023 at 7:40 pm
  
  nagaraj.nednur
  Subscriber
  
  Hallo Experts,
  As more and more usage of Expressions are used, I would like to calculate/create a variable for normal velocity on any given plane and use this variable for further post processing.
  There is already a built in function for dot product in Fluent. All i need is the dot product of velocity & normal vector on each cell to compute the normal velocity.
  Is it possible to achieve this without using any UDF's ?
  
  Thanks in advance,
  Regards
  Nagaraj
- June 22, 2023 at 12:32 pm
  
  Rob
  Forum Moderator
  
  If it's a mesh surface I think you'll need a UDF unless the facet normal is available in the Expression list of variables. For a post processing surface you're going to have more of an issue as they don't have normals.
- August 14, 2023 at 5:49 pm
  
  nagaraj.nednur
  Subscriber
  
  After going through lots of manuals about fluent, the only possible way is to do some UDF programming in C. Everytime i think i am moving forward with Fluent.. It pushes me backwards. C Programming in 2023...Kidding.. Serioulsy dissapointed