 |
 |
 |
|
|
|
[Sponsors] | ||||
June 28, 2019, 16:41
|
Can under-relaxation diverge the solution?
|
#1 |
|
Senior Member
Join Date: Jan 2018
Posts: 121
Rep Power: 8  |
Hi,
I have a FD code. I wanna see the effect of UR factor on the number of iterations. The problem is that when I use UR factors smaller than 0.25, the solution diverges! How can it be possible?! |
|
|
|
|
|
June 29, 2019, 00:10
|
|
#2 | |
|
Senior Member
Arjun
Join Date: Mar 2009
Location: Nurenberg, Germany
Posts: 1,272
Rep Power: 34 |
Quote:
in some codes it is possible if they are using rie and chow dissipation in flux and ap is scaled by this urf factor. In this situation equations would decouple on low relaxation factor. However 0.05 to 0.2 is not so small to really decouple. But it is possible in certain situations. Having said this there is something wrong in that code. |
||
|
|
|
||
 |
|
|
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| Under Relaxation factors in a transient solution | JoshuaB | STAR-CCM+ | 2 | October 8, 2014 15:02 |
| grid dependancy | gueynard a. | Main CFD Forum | 19 | June 27, 2014 21:22 |
| buoyantPimpleFoam - no relaxation | Tobi | OpenFOAM Bugs | 1 | January 14, 2014 17:14 |
| effect of multigrid | daniel | Main CFD Forum | 5 | February 14, 2008 14:00 |
| Wall functions | Abhijit Tilak | Main CFD Forum | 6 | February 5, 1999 01:16 |
1Likes
Linear Mode
