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OpenFoam, SALOME, all free tools for engineers

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)

Click image for larger version

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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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blockMesh,snappyMesh and experimental results for 2D airfoil

Posted April 1, 2013 at 04:17 by skeptik (CFD notes)

A certain Mahdi wrote me via e-mail, that my tetra-mesh and hybrid mesh was not good for simulations.

So here i show results which were obtained with C-mesh generated by blockMesh utility OF, and snappyHexMesh.

blockMesh domain

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mesh near wall

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snappyHexMesh domain

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boundary layer discretization

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Attached Images
File Type: jpg hexasSimple.jpg (44.1 KB, 1978 views)
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