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-   -   Cyclic specification (http://www.cfd-online.com/Forums/openfoam-solving/57982-cyclic-specification.html)

boger February 8, 2009 15:17

Despite reviewing past posts o
 
Despite reviewing past posts on this same topic, I'm still having trouble with specification of a cyclic boundary condition.

The application is a turbomachine with 8 blades, where I'm only solving one passage. I've specified the cyclic boundary, and checkMesh is satisfied with it (faces are correctly ordered, face areas match, etc.).

When I look at the solution (from simpleSRFFoam after foamToFieldview9), I find that the p and Uxrel fields are periodic (as they should be) but so are Uyrel and Uzrel (which should not be). In other words, the velocity is being matched at the cyclic boundaries without being properly transformed (rotated).

I've tried...
cyclic
{
type cyclic;
nFaces 13440 ;
startFace 2229120 ;
featureCos 0.9 ;
transform rotational;
rotationAxis (1 0 0);
rotationCentre (0 0 0);
}
...and...
cyclic
{
type cyclic;
nFaces 13440 ;
startFace 2229120 ;
featureCos 0.9 ;
}
... but get the same behavior in each.

Can someone help point out my mistake?

Thanks.


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