code_saturne User's Forum

Hello,

I am discovering the gas combustion module of Saturne and am concerned about the absorption coefficient used in the radiation model. 4 choices for this absoption coefficient are suggested in the manual :
- Constant
- User subroutine usray3
- User law
- H2O and CO2 mixing (Modak)

It seem to me that the Modak model is the more accurate one and that is the one I am interrested in. However, the GUI does allow me only "Constant" and "User subroutine usray3".

I use :
- Version 4.2 of Code Saturne
- Inflinitly fast chemistry model
- Non-adiabatic combustion
- Chemistry data file dp_C3P

Does anyone know how to use this model?

Thanks a lot,

Hello,

This seems to be a bug in the GUI, which only allows that model for coal combustion. It is actually used for gas in some test cases, but to activate it, you need to use user subroutines (search for modak in examples).

Regards,

Yvan

Hello,

Thank you for answering quickly. I will try this way.

Best regards,

Pierre

Hello Yvan,

I tried to activate this emissivity model through the dedicated user subroutine, but it seem that on my machine the GUI has priority over the user subroutines (although the user manual says that the subroutines have the priority) :
- In cs_parameter.f90, I forced:
- The file listing indicates that Modak model was not activated : You can see attached my RESU file. Can you see anything obviousely wrong in the way I used the subroutine?

Regards,

Hello,

Checking the code, it seems the GUI settings overwrite the user settings in this case.

This is a bug, which I'll fix in the next 4.2.3 release. I'll also check if it is present in other maintained branches and fix it there if required.

Best regards,

Yvan

Hello,

Thank you for your reactivity. When will this version be available (or where can I check the new releases on the website?).

Best regard,

Hello,

There is no fixed date, but I expect to release it by Jan 15.

In the meantime, you may try searching for "imodak" in the xml file using a text editor and change it manually.

Best regards,

Yvan