Search found 28 matches

by bachlinh
Wed Jul 22, 2020 8:56 am
Forum: code_saturne usage
Topic: Divergence ?
Replies: 15
Views: 2309

Re: Divergence ?

Hello The mesh is fully symmetric and uniform. The configuration is attached below. The obstacle is prescribed at a high temperature and concentration while the lateral walls of the cavity are at the lower values. The ceiling and bottom of the enclosure are adiabatic and impermeable. The absorption ...
by bachlinh
Mon Jul 20, 2020 3:05 pm
Forum: code_saturne usage
Topic: Divergence ?
Replies: 15
Views: 2309

Re: Divergence ?

Hello,

Thank you for your answer.
I compared the the flow field and it is non-symmetric as temperature.
I understand your suggestions about the reason of this behaviour.
But do you have any idea about the manner to find out the main origin (physical or numerical) ?

Best regards,
by bachlinh
Wed Jul 15, 2020 7:29 am
Forum: code_saturne usage
Topic: Divergence ?
Replies: 15
Views: 2309

Re: Divergence ?

Hello,

I'm sorry but i don't really understand 'compare that to the flow'.

Regards,
by bachlinh
Fri Jul 10, 2020 10:46 am
Forum: code_saturne usage
Topic: Divergence ?
Replies: 15
Views: 2309

Re: Divergence ?

Hello, Here are the results without (symmetry) and with radiation. Without radiation, the thermal field is symmety but consideration of gas radiation breaks it. For accounting radiation, compared to the without case, i only modified the absorption coefficient in the GUI. It seem this absorption coef...
by bachlinh
Fri Jul 10, 2020 8:18 am
Forum: code_saturne usage
Topic: Divergence ?
Replies: 15
Views: 2309

Re: Divergence ?

Thank you very much for your reply,

I attach here the setup.log file and zipped listing file.

Actually, i used the GUI to enter the value of absorption coefficient. But i will try your suggest.

Regards,
by bachlinh
Thu Jul 09, 2020 1:49 pm
Forum: code_saturne usage
Topic: Divergence ?
Replies: 15
Views: 2309

Re: Divergence ?

Hello,

I used the Code Saturne v5.0.8.
I attach here the files from my simulation.
Please read them and give me a guess about my situation.
However, i cannot upload the listing file.

Regards,
by bachlinh
Tue Jul 07, 2020 7:51 am
Forum: code_saturne usage
Topic: Divergence ?
Replies: 15
Views: 2309

Re: Divergence ?

Hello , In more details, my simulations were the coupling of double diffusive convection and gas radiation at different optical thicknesses. And in all considered cases, only one value of the optical thickness gives this strange behavior. My configuration is a cubic cavity with a small obstacle (hea...
by bachlinh
Tue Jul 07, 2020 7:17 am
Forum: code_saturne usage
Topic: Divergence ?
Replies: 15
Views: 2309

Re: Divergence ?

Thank you
by bachlinh
Mon Jul 06, 2020 10:04 am
Forum: Syrthes related questions
Topic: Radiation convergence
Replies: 5
Views: 1551

Re: Radiation convergence

Hello,
It seems that i have the same problem.
Do you have the answer for this ?
Thank you,
by bachlinh
Mon Jul 06, 2020 9:58 am
Forum: code_saturne usage
Topic: Divergence ?
Replies: 15
Views: 2309

Divergence ?

Hello everyone, I have simulated the convection coupled to radiation in a symmetry geometry. At the end of simulation time, the time evolution of variables remains unchanged. But when i visualized the results, i havenot found the symmetry field as expected. Does it means that my solution divergences...