temperature change fluid

- March 5, 2020 at 11:12 am
  
  bobd
  Subscriber
  
  Dear,
  
  currently i'm trying to do a simulation of a fluent where the temperature is rising due to a polymerization reaction.
  For the temperature profile of the fluid I have written the UDF as follows;
  
  I have implemented this udf as the temperature of the inlet. But during my simulation the temperature of my fluid won't change. And after a couple of time steps I receive a floating point error.
  
  Is there someone who can help me?
  
  Kind regards,
  
  Bobd
- March 6, 2020 at 3:40 pm
  
  Rob
  Forum Moderator
  
  Turn off the UDF and see if the model runs without it.
- March 6, 2020 at 3:44 pm
  
  bobd
  Subscriber
  
  Yes, it works without the UDF
- March 9, 2020 at 4:44 pm
  
  Karthik Remella
  Administrator
  
  Hello,
  
  Since you are using a mathematical expression as a boundary condtion, could you please see if you are able to use Fluent Expressions to resolve your issue? You might be able to entirely circumvent the UDF issue.
  
  Hope this helps.
  
  Best,
  Karthik