DO Model and conduction Flux

[Cyril]

Hi,

I'm using the DO-model of radiation in order to understand how to implement Boundary conditions in Code Saturne. I've got some problems with the DO-model and the conduction flux through wall.

My geometry is very simple a box (5m x 5m x 4m) with an inlet and an outlet face to face. The air mass flow is worth 0,033 kg/s (i.e. 1 vol/h) with a temperature of 20°C.

I put adiabatic walls for the other walls (so 0 W/m²) implemented with the subroutine usray2.f90
The results are very odd : the temperature near walls dicreases to -150°C instead of staying at 20°C like the real physics.

What do you think about this ?

Thanks a lot for answers

Best regards,

Cyril

[Cyril]

Does anyone can help me ?
I'm looking for taking account radiative transfert in my fluid domain which is transparent. I have to use Do-model, P1 or coupling Syrthes model ?

[Yvan Fournier]

Hello,

SYRTHES uses a transparent radiation model, but to couple it with Code_Saturne, you need an associated solid domain. Code_Saturne's radiative model is semi-transparent.

Did you try using a temperature in Kelvin instead ?

Otherwise, please follow the forum usage recommendations, as there is otherwise not enough information to help you.

Regards,

Yvan

[Cyril]

Hello,

thanks for the answer.

I don't want to use Syrthes for this model. I will try with temperature in Kelvin.

best regards,

Cyril