Reaction simulation in Fluent

ankur_kr · February 1, 2013, 19:24

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, 21:38

Quote:

Originally Posted by ankur_kr

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, 00:44

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.

February 1, 2013, 19:24	Reaction simulation in Fluent	#1
ankur_kr New Member Ankur Join Date: Jan 2013 Location: Austin, USA Posts: 26 Rep Power: 13	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.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
chemical reaction modeling using FLUENT	wlt_1985	FLUENT	6	April 16, 2014 07:45
RE: In Volumetric reaction, What is unit of pre-exponential factor used in Fluent ?	AHJ	FLUENT	0	February 18, 2011 06:42
Can dissociation reaction be modeled in FLUENT ?	Ked	FLUENT	0	February 2, 2006 20:55
Plz help! I can't express this reaction in fluent	chang,antony	FLUENT	0	September 8, 2002 03:31
New Fluent Remote Simulation Facility	Paul Bemis	FLUENT	8	July 2, 2002 09:18

February 2, 2013, 00:44		#3
ankur_kr New Member Ankur Join Date: Jan 2013 Location: Austin, USA Posts: 26 Rep Power: 13	Hey thnx

May 28, 2013, 17:51		#4
ankur_kr New Member Ankur Join Date: Jan 2013 Location: Austin, USA Posts: 26 Rep Power: 13	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.