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-   -   symmetry vs. slip Bounday condition (https://www.cfd-online.com/Forums/openfoam-pre-processing/64062-symmetry-vs-slip-bounday-condition.html)

 syoon April 28, 2009 06:45

symmetry vs. slip Bounday condition

I'm not quite sure what is the difference between symmetry boundary condition and slip boundary condition.

According to my understanding, both of them applies zero to normal component and zero gradient to tangential component. dont' they?

Then, what is the difference?

Regards,
Sungho

 Anne Lincke February 22, 2012 07:15

Hey,
I am asking myself the same question.

Kind Regards
Anne

 FelixL February 22, 2012 08:20

Hi, there,

the slip and symmetry BCs are numerically the same.

There can be a difference in how OpenFOAM treats these boundaries in pre- and post-processing, respectively. I.e. slip can be applied to wall-type-boundaries and the wall-only post-processing applications (wallGradU for example) can still be used.

Greetings,
Felix.

 Anne Lincke February 22, 2012 09:15

Thank you for this fast answer, Felix!
:)

 hhh August 30, 2012 09:07

boundary condition (symmetry vs periodic doubt)

Dear friends,
i am doing 3D wing analysis, i have doubt on boundary conditions in fluent ie both symmetry and periodic, anybody have the answer please let me know briefly,for what kind of purpose to use symmetry & periodic boundary conditions, please tell any example with problem.

 s.m April 30, 2013 02:01

Quote:
 Originally Posted by FelixL (Post 345722) Hi, there, the slip and symmetry BCs are numerically the same. There can be a difference in how OpenFOAM treats these boundaries in pre- and post-processing, respectively. I.e. slip can be applied to wall-type-boundaries and the wall-only post-processing applications (wallGradU for example) can still be used. Greetings, Felix.
hi Felix,
would you please explain us more; about how difference OpenFOAM treats these boundaries (symmetry and slip)?
thank you very much:)
i have an airfoil, i set the inlet boundary velocity inlet, and the outlet boundary pressure outlet, i doubt about defining the up and down surface of my airfoil symmetry or slip?
thanks a lot again Felix.

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