Selective mass transfer

  • Last Post 12 March 2019
sumykk posted this 04 March 2019


I'm trying to simulate a counterflow mass exchanger in Fluent. One dry stream of air and one humid stream. I want to define a boundary condition between two streams to transfer water through itself based on differences in partial pressure of water on both sides.

I want to write a UDF for this problem but I'm not good with writing UDFs. Can anybody help me with a sample? 

The picture of my problem is attached to this question. 


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abenhadj posted this 04 March 2019

Will be tough if you do not have experience in writing UDF and parallelizing. Check at your institution if someone can assist you there. As ANSYS Stuff we won't be able to support you here. 

Best regards, Amine

sumykk posted this 04 March 2019


Is there any UDF sample about convective heat (or mass) transfer boundary condition with ambient?

Like: Q= h*(Tcell-Tinf)  

kkanade posted this 05 March 2019

please check help manual. for accessing help, please see following thread.

you can also have quick look on -



sumykk posted this 11 March 2019

Thanks kkanade, 

But my question was how to write the UDF not how to run it in Fluent, 




abenhadj posted this 12 March 2019

Check the manual if you might find a sample. As far as I know we do not have that.

Best regards, Amine