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-   -   Reaction simulation in Fluent (http://www.cfd-online.com/Forums/fluent/112652-reaction-simulation-fluent.html)

ankur_kr February 1, 2013 20:24

Reaction simulation in Fluent
 
Do I need to use UDF (user-defined function) if I have 2 different reactions taking place in different zones in my model. [In my model there is a tube through the center of a Furnace in which combustion occurs. A different reaction takes place inside the tube which uses the heat released by combustion in the furnace]. So, will I need to define a UDF for the reaction in the tube or Fluent allows doing this without using a UDF ?

Someone plz help.

epc1 February 1, 2013 22:38

Quote:

Originally Posted by ankur_kr (Post 405570)
Do I need to use UDF (user-defined function) if I have 2 different reactions taking place in different zones in my model. [In my model there is a tube through the center of a Furnace in which combustion occurs. A different reaction takes place inside the tube which uses the heat released by combustion in the furnace]. So, will I need to define a UDF for the reaction in the tube or Fluent allows doing this without using a UDF ?

Someone plz help.

No, you can easily enable different reactions in different zones via the boundary conditions panel (wall reactions) or in the cell zone panel ( reactions in a fluid zone).

No need for UDF

ankur_kr February 2, 2013 01:44

Hey thnx :)

ankur_kr May 28, 2013 17:51

Hi Ernesto,
When I try to run my simulation with 2 different reaction (mechanism) in different regions, I get the following error,

"ISAT cannot be used with two different gas phase mechanisms" .

Do you have any idea about how to overcome this problem ?
I tried to use 'Direct Integration' instead of 'ISAT' using the 'Integration Parameters' dialog box, but the problem persists.

Plz help.


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