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Modeling internal flow with normal velocities on walls- permeable walls |
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April 27, 2014, 08:07 |
Modeling internal flow with normal velocities on walls- permeable walls
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#1 |
New Member
Ali Madayen
Join Date: Apr 2014
Posts: 22
Rep Power: 12 |
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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April 27, 2014, 19:27 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,841
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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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April 27, 2014, 19:35 |
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#3 |
New Member
Ali Madayen
Join Date: Apr 2014
Posts: 22
Rep Power: 12 |
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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April 27, 2014, 19:55 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,841
Rep Power: 144 |
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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April 27, 2014, 20:05 |
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#5 |
New Member
Ali Madayen
Join Date: Apr 2014
Posts: 22
Rep Power: 12 |
Real Smart.
I will try it for sure |
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April 27, 2014, 20:06 |
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#6 |
New Member
Ali Madayen
Join Date: Apr 2014
Posts: 22
Rep Power: 12 |
Real smart, I will try it for sure
Thanks a lot, friend. |
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normal velocity, permeable wall |
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