Validating a paper on wing tip vortices

holy · March 21, 2012, 04:43

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

indha forum la un doubt ketta solluvaangala? poda dai pacha drogi!

holy · March 22, 2012, 03:28

SUMO.
Public Public.

kalyangoparaju · May 3, 2012, 00:26

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, 07:20

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

March 21, 2012, 04:43	Validating a paper on wing tip vortices	#1
holy New Member pravin kumar Join Date: Jun 2011 Posts: 4 Rep Power: 15	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.

March 21, 2012, 10:46	Dear Mr. Drogi	#2
fayaazhussain New Member Fayaaz Hussain Join Date: Dec 2010 Posts: 12 Rep Power: 16	indha forum la un doubt ketta solluvaangala? poda dai pacha drogi! holy likes this.

March 22, 2012, 03:28	Dear Guru	#3
holy New Member pravin kumar Join Date: Jun 2011 Posts: 4 Rep Power: 15	SUMO. Public Public.

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May 3, 2012, 00:26		#4
kalyangoparaju Member Kalyan Join Date: Oct 2011 Location: Columbus, Ohio Posts: 53 Blog Entries: 1 Rep Power: 15	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

May 3, 2012, 07:20		#5
holy New Member pravin kumar Join Date: Jun 2011 Posts: 4 Rep Power: 15	Hi kalyan, In your geometry did you use trips near the leading edge of your wings?