UDF Ansys fluent problem with negative velocity inlet profile

- December 12, 2017 at 11:52 am
  
  helena_mel
  Subscriber
  
  Hey,
  
  i`m worlking with ansys fluent version 17.2 and simulate a transient velocity profile at the inlet. I have writing a udf with a backflow. It has worked perfectly in August. But now fluent isn`t calculating the negative velocity.
  
  Has anyone the same problem?
- December 16, 2017 at 11:31 pm
  
  Raef.Kobeissi
  Subscriber
  
  An inlet boundary condition as a backflow?! Usually outlet boundary condition supports backflow but I’ve never seen an inlet BC where flow is exitIng rather than entering. Could you please explain your case a little but more.
  
  Cheers
- December 18, 2017 at 11:44 am
  
  José Mantovani
  Subscriber
  
  Like Kobeissi, I've never seen reverse flow in the input, instead of using UDF, try to change the BC or impute the "velocity inlet" into components, and change for a negative velocity.
  
  Hugs.

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