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Old

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

Posted May 16, 2014 at 01:34 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
...
Continue reading...
Attached Thumbnails
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Old

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

Posted May 15, 2014 at 03:09 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
...
Continue reading...
Attached Thumbnails
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Old

Rotating diverging flow, validation #2

Posted March 20, 2014 at 06:38 by skeptik (CFD notes)
Following previous post about SRFSimpleFoam, i conclude that it's not perfect solver for simulations

Also i have had many problems with stability and convergence. Not in this simple case but in case of rotating blade.

Name: rotChannelSigma60.jpg Views: 1158 Size: 31.6 KB
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Old

Rotating diverging flow, validation

Posted March 19, 2014 at 06:29 by skeptik (CFD notes)
I've found interesting article about experimental investigation of a rotating diverging flow.

http://www.lmfa.ec-lyon.fr/ISAIF/Dat...AIF8-00105.pdf

There are a good data about geometry and results so i decided to conduct simulation in SRFSimpleFoam.

what i have for 30 rad/sec and Re=15800 (3m/s at inlet)

Name: rotChannelSigma30.jpg Views: 913 Size: 30.7 KB

The coincidence is pretty good but not perfect. Data for 60 rad/sec is coming soon.
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Old

salomeToOpenFOAM mesh conversion

Posted March 14, 2014 at 06:36 by skeptik (CFD notes)
I met one big problem when i have converted SALOME mesh by UNV format and ideasToFoam utility.

It was not usual mesh, it contained pyramids. See fig.

Name: mesh_scr.jpg Views: 1524 Size: 97.1 KB

I spent a lot time to achieve the same result like i can using ICEM. Only when i've found salomeToOpenFOAM script i successfully converted my mesh.

So i recommend it. The script is very helpful.

https://github.com/nicolasedh/salomeToOpenFOAM
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