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Forum: OpenFOAM Running, Solving & CFD

November 7, 2007, 07:07

Replies: 25

Symmetrical Model With Non Symmetrical Solution

Views: 4,603

Posted By fugu

Dragos, you were totally righ

Dragos,
you were totally right: the flow past a sudden expansion is inherently unstable and asymmetrical
when Re exceeds a critical value. Even the RANS mean flow shows asymmetrical features at...

Forum: OpenFOAM Running, Solving & CFD

November 5, 2007, 14:34

Replies: 25

Symmetrical Model With Non Symmetrical Solution

Views: 4,603

Posted By fugu

Jason, looking at your geomet

Jason,
looking at your geometry I was wondering if you tried to switch inlet/outlet and/or rotate the
geometry 90 degrees around the main axis to see
if you get the same asymmetries.
Luca

Forum: OpenFOAM Running, Solving & CFD

November 5, 2007, 04:05

Replies: 25

Symmetrical Model With Non Symmetrical Solution

Views: 4,603

Posted By fugu

Dragos, I noticed from the in

Dragos,
I noticed from the input files that no turbulence model was used. If your point is that symmetry in
bc and geometry does not imply symmetry in the solution I totally agree with you. ...

Forum: OpenFOAM Running, Solving & CFD

November 4, 2007, 18:38

Replies: 25

Symmetrical Model With Non Symmetrical Solution

Views: 4,603

Posted By fugu

Dragos, as a matter of fact t

Dragos,
as a matter of fact there are a number of papers on steady flow asymmetry on a sudden expansion
(e.g. R. M. Fearn , T. Mullin and K. A. Cliffe Nonlinear flow phenomena in a symmetric...

Forum: OpenFOAM Running, Solving & CFD

November 2, 2007, 15:22

Replies: 25

Symmetrical Model With Non Symmetrical Solution

Views: 4,603

Posted By fugu

It seems to me it is a mesh re

It seems to me it is a mesh related issue.
Just to exclude other issues:
- What solver are you using ?
- What turbulence model ?

Also if you could post the geometry I might take a quick...

Forum: OpenFOAM Running, Solving & CFD

November 1, 2007, 12:47

Replies: 25

Symmetrical Model With Non Symmetrical Solution

Views: 4,603

Posted By fugu

IMHO when the geometry and bc

IMHO when the geometry and bc are symmetrical the solution has to show the same symmetry at least in fully laminar cases. In transitional and turbulent flow this is not true, however the velocity...

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