problem with cyclicAMI and wall distance
I'm having some problems with cyclicAMI patches (OpenFOAM 2.1.1).
I'm working on a 3-bladed wind turbine, meshing a third of the domain (120-degree slice, single rotating reference frame).
The model is SpalartAllmaras and the solver is MRFSimpleFoam (by the way, MRFSimpleFoam is far more stable than SRFSimpleFoam in my opinion).
At the beginning I had problems with the convergence of nut and nuTilda.
After trying a lot of different schemes and relaxation factors, I noticed that "y" (wall distance in yPlusRAS) was calculated wrong. And I thought: that's why nut is not good.
With "cyclic" patches the wall distance is ok, so cyclicAMI seemed to be the problem.
Then I found this thread,
I added the cyclicAMI patches to "nonRotatingPatches" in MRFZones dictionary and now my results are ok (at least they seem ok).
But the wall distance y is still not good. I don't know if this can cause any problem, maybe with the calculation of y+.
The attached images show the problem with the calculation of y on the cyclicAMI patches (purple arrow).
The contour of y shows where the problem starts (yellow arrow), i.e. where it thinks there's a wall but there isn't.
I created the cyclicAMI patches with the following createPatchDict.
Is this a bug or am I doing something wrong? Do I have to worry about this? (will y+ be calculated right?)
Thank you in advance
there's an easy way to reproduce this.
in the "mixer" tutorial (incompressible/SRFSimpleFoam/mixer) replace the cyclic patches with cyclicAMI patches.
run yPlusRAS and you will get strange "y" contours.
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