UDF for G-Equation Model

AEAli · May 12, 2024, 21:20

Hello all,

I am trying to write and build a udf to implement a turbulent flame speed correlation based on experimental data from my lab. In the examples/combustion/g_eqn/g_eqn_unburned.c, there are models to be used with either RANS or LES. I need to add one, but I don't know how to refer it to CONVERGE Studio when I'm setting up the case. There is no option to add a custom model.

Best regards,
Abdalrazik Ali

rvigneshwar · May 13, 2024, 15:13

Hi AEAli,

Not sure which solver version you are using.

If using 3.1, you need to turn on turn on g-eqn in combustion chemistry.
image (7).png
the udf include all the g_eqn routine. But you just needs to modify the turbulent flame speed part.

If using 4.0, Converge has a user_turbulent_flamespeed_flag that user can directly modify the routine. In that case you dont need to use the whole g_eqn udf.

Hope it helps. If you have more question on setting up the case or UDF, you can contact support, the team can help build a UDF or fix the case setup accordingly.

May 12, 2024, 21:20	UDF for G-Equation Model	#1
AEAli New Member Abdalrazik EssamAldin Join Date: Apr 2023 Posts: 13 Rep Power: 3	Hello all, I am trying to write and build a udf to implement a turbulent flame speed correlation based on experimental data from my lab. In the examples/combustion/g_eqn/g_eqn_unburned.c, there are models to be used with either RANS or LES. I need to add one, but I don't know how to refer it to CONVERGE Studio when I'm setting up the case. There is no option to add a custom model. Best regards, Abdalrazik Ali

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May 13, 2024, 15:13		#2
rvigneshwar New Member Vigneshwar Ravisankar Join Date: Apr 2019 Posts: 26 Rep Power: 7	Hi AEAli, Not sure which solver version you are using. If using 3.1, you need to turn on turn on g-eqn in combustion chemistry. image (7).png the udf include all the g_eqn routine. But you just needs to modify the turbulent flame speed part. If using 4.0, Converge has a user_turbulent_flamespeed_flag that user can directly modify the routine. In that case you dont need to use the whole g_eqn udf. Hope it helps. If you have more question on setting up the case or UDF, you can contact support, the team can help build a UDF or fix the case setup accordingly.