|
[Sponsors] |
July 23, 2002, 01:40 |
Why do some streamlines converge to one?
|
#1 |
Guest
Posts: n/a
|
I am calculating a scramject combustor with seven species and eight-step H2-O2 reactions. The air with some H2O flows in the combustor, and H2 is injected from some injectors at wall at the normal direction to the wall. I use MUSCL TVD and LU-SGS to solve one temperature nonequilibrium chemical reaction N-S equations with B-L turbulence model.
After more than 10000 iterations under CFL number 0.5, the flow field seems OK. However, following the increasing iterations, the program diverges. Some streamlines converge to one, and sinks or sources appear in the flow field. Can any one give me some suggestions? All comments are warmly welcomed! Thanks in advance! |
|
August 26, 2002, 22:34 |
Re: Why do some streamlines converge to one?
|
#2 |
Guest
Posts: n/a
|
It sounds like your solution is either diverging, or getting ready to. This may be related to your chemistry modeling... You might try turning all your chemical reactions off and see if your solution converges. And/or you might try decreasing your CFL and see if the same problem arises.
|
|
August 27, 2002, 22:18 |
Re: Why do some streamlines converge to one?
|
#3 |
Guest
Posts: n/a
|
Soupy,Thank you very much!! As you said, the solution diverges after some stream lines converge to one. However, if turn off chemical reaction, the solution behaves very well. I will check my program again.
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[CFD Post] Surface streamlines not located where needed | siw | CFX | 1 | July 7, 2011 19:13 |
Streamlines under Moving reference frame; Spiral streamline from Tecplot | aiqch | Tecplot | 2 | October 29, 2009 23:27 |
Custom streamlines - only 2 velocity components | bernarde | STAR-CCM+ | 5 | August 24, 2009 07:18 |
HELP !In relaxtion factor converge is taken or not | MANOJ KUMAR | FLUENT | 5 | September 22, 2005 04:16 |
STAR-CD, moving grid and streamlines | Mohamed GUEROUACHE | Main CFD Forum | 1 | September 13, 1999 13:33 |