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Automation for auxiliary flow rate when using heat exchanger module on fluent

- May 18, 2026 at 5:17 am
  
  cheolmae
  Subscriber
  
  I would like to use the Heat Exchanger module for flow analysis inside a factory. In particular, I am trying to do an unsteady analysis that controls the coil's auxiliary flow rate depending on the temperature at a specific location, but I am wondering if UDF or Expression cannot be applied.
  Does anyone know if there is a solution for this?
- May 18, 2026 at 8:56 am
  
  Rob
  Forum Moderator
  
  Looking at the panel, I suspect it's a no for Expressions as there isn't an option to hook them in. There might be some UDF hooks, but as I can't see a hook in the panel, nor the UDF function hooks I can't say for sure. There might be some semi-hidden options but I don't know, and if I found out I'd be unable to comment on the Forum.
  Note, the heat exchanger model was added for a few specific purposes as an addon in about v6 so may lack the user function hooks if they're hard coded elsewhere in Fluent.
  An alternative might be to code up a DEFINE_SOURCE UDF for energy and write your own version.
  - May 20, 2026 at 1:34 am
    
    cheolmae
    Subscriber
    
    Um... Can you report to dev team about this? I think that is not difficult job... If I can control auxiliary flow by expression or udf then I will be happy.
- May 20, 2026 at 8:01 am
  
  Rob
  Forum Moderator
  
  I will put an enhancement request in. I can't feedback on anything on that process though, and that includes any acceptance/release information.

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