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Slip BC not working properly

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Old   March 26, 2010, 14:06
Exclamation Slip BC not working properly
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Fran
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Running the cavity case with icoFoam, I changed the boundary condition for the fixedWalls patch from fixedValue to slip, changing also the boundary file from wall to patch. I did this in order to test the slip BC in a simple case.

The result was not what I had expected. The side walls defined as slip walls, when visualized with paraFoam, show velocity in the X direction (normal to the patch). This should not happen acording to the definition of the condition "slip" given by OpenFOAM.

"Slip: zeroGradient if is a scalar; if is a vector, normal component is fixedValue zero, tangential components are zeroGradient"


Has anyone else had problems with this condition? Is it an OpenFOAM bug, or am I just missunderstanding what slip BC should do? Maybe I am missing some additional setting in order to make slip condition work.


Pressure condition is zeroGradient as in the original icoFoam/cavity case.



Thank you.
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Old   March 27, 2010, 12:30
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Andrea Pasquali
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Also p, k and epsilon are slip.
You can check the motorbike tutorial.

regards

Andrea
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Old   June 21, 2010, 03:47
Smile slip boundary condition
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王国斌
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Recently ,i do a lot of subjects on 'slip boundary condition',
some theoretically work have done, next step is how to implement in a soft ,which could deal with slip boundary conditon ,
thank you for your sharing that successful case!
thank you !
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Old   July 15, 2010, 09:53
Default ParaFOAM
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Michael B Martell Jr
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This is simply a paraFoam artifact. Change the rendering mode and you will see those X velocities disappear.
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