CFD Online Discussion Forums

TSAGI HERITAGE, NACA23012, M=0.62, alpha = 0.17 grad

Posted May 16, 2014 at 02:34 by skeptik (CFD notes)

Code:

#NACA 23012 exp. results alpha = 0°10' M=0.62
# Cp=(Pfoil - Pinfinity)/q; q = rho*U^2/2
#columns
#    x    Cp
#Upper
0.648850002166  0.594351799714
1.00056308745  0.206219950622
3.45475808897  -0.457764109672
6.14544982025  -0.727560965045
8.6724130463  -0.885641269979
10.7411097154  -0.932091653311
13.3867544506  -0.89601940486
20.5760817776  -0.711551955646
24.6874864642  -0.627989777797
32.0344782778  -0.51406419197

...

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skeptik

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TSAGI HERITAGE, NACA23012, M=0.5, alpha = -1.2 grad

Posted May 15, 2014 at 04:09 by skeptik (CFD notes)

I have some useful papers totally on Russian.

I will post some experimental results about airfoils here as i will translate it to appliciable form.

Here are the results which could be easily plotted by GNUplot. They are from far away 1946, TSAGI (Central Aero-, Gas-Dynamics Institute) publisher.

Code:

#NACA 23012 exp. results alpha = -1°12' M=0.5
# Cp=(Pfoil - Pinfinity)/q; q = rho*U^2/2
#columns
#    x, %    Cp
#Upper
1    0.6

...

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skeptik

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Ph.D. Thesis on LES

Posted May 1, 2014 at 13:24 by sbaffini (NuTBox)
Updated December 21, 2016 at 10:08 by sbaffini

I recently defended my thesis on Large Eddy Simulation, which is now available at:

http://hdl.handle.net/10589/89603

I won't spend too much words on promoting it, you can read the abstract for this. I just want to say it possibly provides a fresh view on the matter of implicit/explicit filtering, commutation errors and other evergreen topics in LES. As i put a specific effort on this, i also hope that it might work as a not too heavy introduction on LES in general. Finally,...

sbaffini

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Posted in LES

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Enhanced Wall Treatment

Posted April 11, 2014 at 17:53 by diamondx

Useful near wall treatments informations:

Quote:

Originally Posted by Far

This is completely wrong

If this is true then they would have used the simple else-if command which was used in the previous version of SA and K-Omega model. Still you can observe in the theory guide of Fluent (I am talking about SA model) they are using the integration to wall approach for the Y+< 2 and wall function approach for the Y+>30 and strongly recommend to make the meshes either with Y+< 2 or Y+> 30 so that they

...

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y+ calculator for equilibrium flows

Posted April 10, 2014 at 04:58 by sbaffini (NuTBox)
Updated December 21, 2016 at 10:08 by sbaffini

y+ calculation is, possibly, the most pervasive topic among CFD practitioners and, certainly, anybody doing CFD for more than a month already has his own tool to compute it.

Still, all the y+ calculators i am aware of rely on a very specific flow condition, namely, a flat plate boundary layer. This is probably the most common practical case but not the only option. For example, the fully developed flow in a pipe is cretainly different and possibly requires a different input for the...

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