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-   -   Modeling internal flow with normal velocities on walls- permeable walls (https://www.cfd-online.com/Forums/cfx/134279-modeling-internal-flow-normal-velocities-walls-permeable-walls.html)

 AliMadayen April 27, 2014 07:07

Modeling internal flow with normal velocities on walls- permeable walls

Hi everyone.

I'm trying to simulate blood flow in a vessel, where the boundary condition on wall for u is no slip, but for v is a constant definite value. In other words, wall is permeable in y direction. How can I apply this kind of boundary to my problem in CFX?

Tnx for your help

 ghorrocks April 27, 2014 18:27

I presume you mean u is in the tangential direction and v is in the normal direction.

The easiest way of doing this would seem to be a normal no-slip wall with a mass source/sink applied to the wall which gobbles up fluid at your prescribed rate.

 AliMadayen April 27, 2014 18:35

Tnx for your reply
your assumption is correct.
But now the question is what is the relation between source/sink intensity and the normal velocity?
Question is posed regarding that the problem specifies the normal velocity on the wall, and nothing more.

 ghorrocks April 27, 2014 18:55

Make the magnitude of the mass sink a function of the wall shear stress. I would not make it a function of normal velocity as it will then be mesh dependent.

 AliMadayen April 27, 2014 19:05

Real Smart.
I will try it for sure

 AliMadayen April 27, 2014 19:06

Real smart, I will try it for sure
Thanks a lot, friend.

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