|
[Sponsors] |
October 19, 2005, 00:42 |
CDS a thought
|
#1 |
Guest
Posts: n/a
|
There have been lot of discussion about CDS being unstable due to the reason that it can give unphysical oscilation in solution. I was wondering whether this is the reason for it:
when we descretise the equations we get (ap_conv + ap_diff) phi_p = sum(a_i * phi_neigh) + SU now if (ap_conv + ap_diff) ~ 0 we get very high values of phi_p if we are solving by gauss seidel etc. that is we can not write the equation as : phi_p = ( sum(a_i * phi_neigh) + SU) / (ap_conv + ap_diff) as needed by Gauss Seidel. Is this the reason for unstablity. Could someone comment on it. |
|
October 19, 2005, 12:40 |
Re: CDS a thought - off topic
|
#2 |
Guest
Posts: n/a
|
I'm wondering: "raaxz" means "zxaar" ?
|
|
October 19, 2005, 18:10 |
Re: CDS a thought - off topic
|
#3 |
Guest
Posts: n/a
|
No i did not post it. But its good observation
|
|
October 19, 2005, 20:02 |
Re: CDS a thought - off topic
|
#4 |
Guest
Posts: n/a
|
U r correct its reverse of zxaar, because it came to my mind when i was reading some message by zxaar, so could not think of different name to put on, so just used reverse of it.
|
|
October 20, 2005, 10:47 |
Re: CDS a thought - off topic
|
#5 |
Guest
Posts: n/a
|
!noitanigami fo kcaL
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Turbulent channel flow | roberthino | OpenFOAM Running, Solving & CFD | 5 | August 15, 2007 08:35 |
[Commercial meshers] Converting meshes that includes interfaces | ham | OpenFOAM Meshing & Mesh Conversion | 29 | January 8, 2007 08:58 |
Better to use QUICK than CDS for my case? | Ben | Main CFD Forum | 1 | November 18, 2006 09:30 |
van leer and cds scheme for LES smc | fabian | Main CFD Forum | 2 | March 31, 2006 02:22 |
A thought on Wall Y+ | Sham | FLUENT | 1 | May 18, 2005 00:48 |