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-   -   Onera M6 wing (http://www.cfd-online.com/Forums/main/5380-onera-m6-wing.html)

sheetal November 7, 2002 01:18

Onera M6 wing
 
Dear All,

Has anybody solved the Onera M6 wing problem mentioned on site

http://www.grc.nasa.gov/WWW/wind/val...ng/m6wing.html

I have solved this in CFX Tascflow but the results are not matching with the experimental data given on the site. Please share your experiences.

regards, sheetal


Li Yang November 7, 2002 07:32

Re: Onera M6 wing
 
The exerimental data should be correct. You can check the data in the original report: AGARD-AR-138.

Regards

Li

Praveen November 7, 2002 08:47

Re: Onera M6 wing
 
This is a very gentlemanly problem which every beginner of aerospace cfd solves. Mybe you should give details of your grid and flow solver, and tell us how the results differ from experiments ?

sheetal November 8, 2002 08:05

Re: Onera M6 wing
 
Hi!

The grid size is approx. 0.75 million. I solved the problem using k-w as well as k-e model (CFX TASCflow). I tried UD as well as modified linear profile schemes. But all the results are more or less same. The exp data shows that there is shock formation at approx middle of the suction side of the wing. But my analysis shows that the shock is blown off from the surface. Means the results are like analysis done for lower angle of incidence or higher Mach number with respect to the experiment. The pressure coefficients plots are not matching especially on suction (top) side.

I am going through AGARD. Thanks

Sheetal

boling November 10, 2002 13:34

Re: Onera M6 wing
 
How about your grid distribution in the direction normal to the wall? Accoring to my experience, if there were not enough grids in boundary layer , you could not get the correct solution if you are using k-w model.

Sheetal November 11, 2002 01:15

Re: Onera M6 wing
 
I have already checked the grid distribution near the boundary. It is ok. I used structured mesh generated in ICEM Hexa. Has anybody solved the problem and got the correct result? The experimental results should be correct. Code may not be simulating correctly. On the same site they have mentioned the simulation done with WIND code and got the matching results.

Thanks,

Sheetal

boling November 11, 2002 13:01

Re: Onera M6 wing
 
could you try to solve the problem using the grid from that webpage ? I used to solve that using the grid from the webpage, it worked well.

sheetal November 12, 2002 00:52

Re: Onera M6 wing
 
Thanks boling!

I will do that.

Sheetal

Neale November 12, 2002 15:33

Re: Onera M6 wing
 
What do you mean by the grid distribution is OK at the boundary. How many control volumes do you have in the boundary layer?

You should probably be using SST with the automatic wall funciton treatment for this case, rather than k-omega or k-epsilon. Make sure you have at least 5-6 control volumes in your boundary layer with SST.

Neale.

Subramanya_Naik May 28, 2009 11:30

Hi. Can anybody please forward me experimental data for Onera M6 wing. I am new to this . Can you help me? my mail id is ansubramanya@gmail.com


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