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Modeling internal flow with normal velocities on walls- permeable walls

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Old   April 27, 2014, 07:07
Default Modeling internal flow with normal velocities on walls- permeable walls
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Ali Madayen
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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
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Old   April 27, 2014, 18:27
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Glenn Horrocks
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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.
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Old   April 27, 2014, 18:35
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Ali Madayen
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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.
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Old   April 27, 2014, 18:55
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Glenn Horrocks
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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.
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Old   April 27, 2014, 19:05
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Ali Madayen
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Real Smart.
I will try it for sure
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Old   April 27, 2014, 19:06
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Real smart, I will try it for sure
Thanks a lot, friend.
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