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-   -   Slip BC not working properly (http://www.cfd-online.com/Forums/openfoam/74219-slip-bc-not-working-properly.html)

lfbarcelo March 26, 2010 14:06

Slip BC not working properly
 
1 Attachment(s)
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 http://www.openfoam.com/docs/user/img/user450x.png is a scalar; if http://www.openfoam.com/docs/user/img/user451x.png 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.

andrea.pasquali March 27, 2010 12:30

Also p, k and epsilon are slip.
You can check the motorbike tutorial.

regards

Andrea

wangguobin14 June 21, 2010 03:47

slip boundary condition
 
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 !

theory37 July 15, 2010 09:53

ParaFOAM
 
This is simply a paraFoam artifact. Change the rendering mode and you will see those X velocities disappear.


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