Search found 55 matches

by xingjian
Tue Jul 25, 2017 10:41 am
Forum: Code_Saturne usage
Topic: Pressure difference
Replies: 5
Views: 1519

Re: Pressure difference

Hello Yvan,

I do not want to change the subroutine, if i just use the GUI, can I achieve this function?

Thank you very much

Best Regards

XING Jian
by xingjian
Thu Jul 20, 2017 9:33 am
Forum: Code_Saturne usage
Topic: Pressure difference
Replies: 5
Views: 1519

Re: Pressure difference

Hello Yvan,

Could you please explain more in detail, by using which function?

Thanks very much

Best Regards

XING Jian
by xingjian
Tue Jul 18, 2017 2:39 pm
Forum: Code_Saturne usage
Topic: Pressure difference
Replies: 5
Views: 1519

Pressure difference

Hello,

I want to add a turbine in an exhaust pipe to enhance its exhaust performance, do not need to simulate a real turbine, because there is a the pressure difference, so how can achieve a pressure difference in CS?

Best Regards

XING Jian
by xingjian
Thu Jul 06, 2017 8:41 pm
Forum: Code_Saturne usage
Topic: Problem about 'Residual', 'Drift', 'CFL number'.
Replies: 15
Views: 4168

Re: Problem about 'Residual', 'Drift', 'CFL number'.

Hello Yvan,

So how can I solve it? Actually I use CS5.0.1 now, maybe I try it with 5.0.0?

Best Regards

XING Jian
by xingjian
Wed Jul 05, 2017 6:42 pm
Forum: Code_Saturne usage
Topic: ‘Restart’ results in divergence.
Replies: 5
Views: 1544

Re: ‘Restart’ results in divergence.

Hello Yvan, I did not change any settings, just in 'restart', I chose the 'checkpoint' in the directory that I calculated before. And I do not understand, you said that 'convergence tool' is more common under Windows, but I clicked it in 'GUI', there appear nothing, it does not have any reaction. So...
by xingjian
Wed Jul 05, 2017 6:29 pm
Forum: Code_Saturne usage
Topic: Problem about 'Residual', 'Drift', 'CFL number'.
Replies: 15
Views: 4168

Re: Problem about 'Residual', 'Drift', 'CFL number'.

Thank you Yvan.

Here are 'XML', 'residual.csv' and 'listing'. Is my residual of the 'residual.csv' incorrect? They are should be 10E-03(or E-04;E-05) like 'Norm. Residual' in 'listing'?

And for the 'Courant Nb', 'Max CFL Nb', should I increase it?

Best Regards

XING Jian
by xingjian
Wed Jul 05, 2017 3:36 pm
Forum: Code_Saturne usage
Topic: ‘Restart’ results in divergence.
Replies: 5
Views: 1544

‘Restart’ results in divergence.

Hello, I stopped the calculation when it ran to 1000 steps, to observe the results, because that's a too big calculation, if there is an error I can adjust in time. It was very stable, but after the 'restart' there is a great fluctuation, like this: 8.png But I didn't change anything, I don't unders...
by xingjian
Wed Jul 05, 2017 3:21 pm
Forum: Code_Saturne usage
Topic: Problem about 'Residual', 'Drift', 'CFL number'.
Replies: 15
Views: 4168

Re: Problem about 'Residual', 'Drift', 'CFL number'.

And for 'CFL number', it is 'Courant number'? CFL=U*Dt/Dx with U is with U is characteristic velocity, Dx is characteristic length. Fo=v*Dt/Dx^2 with v is viscosity, Dx is characteristic length. I want to obtain the maximum CFL and Fourier, I chose the fastest, and the mesh is the finest area. Dx=0....
by xingjian
Wed Jul 05, 2017 2:55 pm
Forum: Code_Saturne usage
Topic: Problem about 'Residual', 'Drift', 'CFL number'.
Replies: 15
Views: 4168

Problem about 'Residual', 'Drift', 'CFL number'.

Hello, This time I simulate the total nozzle, all the boundary conditions are reasonable, and I calculated it with CS 5.0.1 with Windows. Here is my problem, because the new version has the file 'residual.csv' in the directory 'RESU', so I opened it with ParaVis: 4.PNG It seems very stable, then I z...
by xingjian
Wed Jun 21, 2017 8:45 am
Forum: Code_Saturne usage
Topic: Convergence
Replies: 21
Views: 4010

Re: Convergence

Hello Quentin,

It's Norm. residual I think, but I recommend that you can download version 5 and install it, because it will generate a 'residual.csv' file automatically in the directory 'RESU' by calculating with version 5. And you could observe it with Paravis.

Best Regards

XING Jian