[syoon]

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]

Hey,
I am asking myself the same question.
Is there an answer already?

Kind Regards
Anne

[FelixL]

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]

Thank you for this fast answer, Felix!

[hhh]

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]

Originally Posted by FelixL

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.