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-   -   Validating a paper on wing tip vortices (http://www.cfd-online.com/Forums/fluent/98876-validating-paper-wing-tip-vortices.html)

holy March 21, 2012 04:43

Validating a paper on wing tip vortices
 
Hi ppl,
I'm trying to validate "Numerical study of a wingtip vortex in the near field" by Dacles-mariani et al. In this paper they have validated using a code written by them which is "fifth order accurate" and they used a modified Baldwin-Barth as the turbulence model. They have also added that third order accurate scheme was too dissipative. I'm trying to validate this paper in fluent which is limited to third order accurate scheme and no turbulence model such as Baldwin-Barth is available in fluent.
The link below is a paper which tried to validated that same Dacles-Mariani paper.
http://wvuscholar.wvu.edu:8881//exli...8xMzYxNQ==.pdf
I ran iterations in fluent giving the following parameters as given in the above link.
Boundary conditions:
Working condition: 101325 pa
Velocity inlet : 170ft/s
pressure outlet: 0 pa (reference pressure)
All others are kept as stationary wall except the wall of symmetry.
Turbulence model : SPALART ALLMARAS.(S-A)
Scheme: SIMPLE
Gradient: LSQ CELL BASED (Least square cell based)
Pressure: second order
Continuity:QUICK
Momentum:QUICK
But i can't get good results. The results i'm getting are far more deviated from the actual results.

Can anyone help me to get better results?
Thanks in advance.

fayaazhussain March 21, 2012 10:46

Dear Mr. Drogi
 
indha forum la un doubt ketta solluvaangala? poda dai pacha drogi!

holy March 22, 2012 03:28

Dear Guru
 
SUMO.
Public Public.

kalyangoparaju May 2, 2012 23:26

Holy,

I am doing the same thing as a part of the research for my Ph.D. There is no way you can get good results from a standard turbulence model. It is too dissipative and the results will be off by a lot.

Kalyan

holy May 3, 2012 06:20

Hi kalyan,
In your geometry did you use trips near the leading edge of your wings?


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