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OpenFoam, SALOME, all free tools for engineers
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As good as ICEM

Posted July 19, 2013 at 06:13 by skeptik (CFD notes)

Tetra mesh with prism layers generated in SALOME.

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Old

Fresh sonicFoam NACA airfoil results

Posted May 29, 2013 at 05:52 by skeptik (CFD notes)

pretty good results. but i need to simulate airfoil with trailing edge flap so i need accurate Cp at x/c=1.

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Old

Airfoil NACA 23012 results, transonic flow

Posted May 28, 2013 at 05:38 by skeptik (CFD notes)

What i've got about my airfoil (exp and Fluent data were extracted from article, but it's in russian. originally exp data from TZAGI report)
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So there present oscillations, they were caused by second order schemes. I'll simulate it on upwind later.

The differences in p fields are showed here:

upwind
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linear corrected 1
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Old

2D-empty vs pseudo 2D upd. results

Posted April 18, 2013 at 02:53 by skeptik (CFD notes)
Updated April 18, 2013 at 03:15 by skeptik

Pseudo 2D results is here on the graph
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Cx is predicted very well, so let's make a comparation with 2D results

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The difference is really big on supercritical angles, the PISO's results on 2D tetra meshes were also bad and quite similar to the 2D hexa's results.

So, it's better to use PISO with symmPlane or slip BC on domain's sides

#OpenFoam #2Dairfoil
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2D-empty vs pseudo 2D - symmPlane

Posted April 15, 2013 at 04:35 by skeptik (CFD notes)

It seems there is big difference in case with 1-cell thick domain where we set empty BC compare to case with 5-cells or 3 - cells thick where we set symmPlane

for SST and NACA23012 we have (17 and 15 grad angle of attack)

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So when we use PISO, it would be better to use 5 or 3 -cells thick domain.
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