[sina769]

Hello all!
I want to solve a problem with openFoam in which a moving body
in fluid field has slip velocity B.C. I think I must
use movingWallVelocity as a boundary condition for
a solver such a pimple or interdymfoam but how can I
modify slip boundary condition?

I appreciate everyone's attention.

[hjasak]

You need a special boundary condition - I think there is one called movingWallSlipFvPatchVectorField

Hrv

[sina769]

Originally Posted by hjasak

You need a special boundary condition - I think there is one called movingWallSlipFvPatchVectorField

Hrv

thank you hjasak!
Could you give me some detail about modification of this B.C.
I need a B.C that use some information of flow field to compute the
Slip velocity ! in your opinion, is this suitable ?

[hk318i]

You can modify it to be something like the below relation which is a combination between movingWallVelocity BC and partial slip.
All you have to do calculate the valueFraction_ based on your flow field parameters which you are interested in.

vectorField::operator=((n*((Up + n*(Un - (n & Up))) & n)) + ((1.0 - valueFraction_)*transform(I - sqr(nHat), this->patchInternalField())));

It isn't a tested code, it is to give you a general idea.

Best wishes