New devolatization model with UDF

Cigna · November 10, 2014, 11:50

Hi to everybody,
I'm trying to change the devolatilization model of FLUENT with a new one using a UDF. I wrote the UDF and the program compiles it without errors. I hooked the UDF into the Custom Laws panel with this order:

Inert Heating - First Law
Inactive - Second Law
Inactive - Third law
My devolatilization UDF - Fourth law
Surface Combustion - Fifth law
Inert heating - Sixth law

as suggeted in the table of the Theory Guide 16.4 - Law for Heat and mass exchange (Column: Particle Type;Raw: combusting).
Running the simulation, the particles injected do not lose the volatile mass fraction that is always constant at the initial value.
I tried with single rate and two-competing rates devolatilization model and it works so I'm sure that the case is ok.

Do you have any idea to solve this problem?

felipecingmec · April 4, 2015, 16:50

Hello, Let me see your udf code... maybe I can help you... do you have a DEFINE_DPM_SWITCH function?

November 10, 2014, 11:50	New devolatization model with UDF	#1
Cigna New Member Nicola Join Date: Nov 2014 Posts: 6 Rep Power: 12	Hi to everybody, I'm trying to change the devolatilization model of FLUENT with a new one using a UDF. I wrote the UDF and the program compiles it without errors. I hooked the UDF into the Custom Laws panel with this order: Inert Heating - First Law Inactive - Second Law Inactive - Third law My devolatilization UDF - Fourth law Surface Combustion - Fifth law Inert heating - Sixth law as suggeted in the table of the Theory Guide 16.4 - Law for Heat and mass exchange (Column: Particle Type;Raw: combusting). Running the simulation, the particles injected do not lose the volatile mass fraction that is always constant at the initial value. I tried with single rate and two-competing rates devolatilization model and it works so I'm sure that the case is ok. Do you have any idea to solve this problem?

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April 4, 2015, 16:50		#2
felipecingmec New Member MG Join Date: Oct 2012 Posts: 3 Rep Power: 14	Hello, Let me see your udf code... maybe I can help you... do you have a DEFINE_DPM_SWITCH function?