Learning Forum

[Jee Loong Hee]

Hi,

I am interested to reduce the outlet temperature at the outlet of a domain (say a straight pipe) assuming that there is an heat exchanging effect occuring near the outlet (despite I am not modelling the sub-system). In other words, if I put in 1000C, I ought to get 800C if there is a 200C heat exchanging occuring. 

Could you tell me where can I start to learn the UDF (syntax and commands?) I was able to perform the simple transient UDF BC  Inlet using interpret function and resources found online.

Secondly, will this operation also enable me to get a 'revised/tuned' NOx formation value at the outlet because of the reduced 200C temperature at the outlet? Or to get the effect, I should set a new plane somewhere upstream before the outlet and implement the UDF + run the NOx formation model? So by the time the fluid reaches the outlet, the NOx will be representative of the final outlet value?

Could you advise? 

Thanks!
Jee 

[SRP]

HI,

I suggest you to check fluent customization manual: Chapter 1: Overview of User-Defined Functions (UDFs) (ansys.com)

To simulate the effect of the reduced temperature on NOx formation,you may be able to modify the reaction rates based on temperature changes. This can be complex and may require additional UDFs.

Hope this helps you.