# Modeling internal flow with normal velocities on walls- permeable walls

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 LinkBack Thread Tools Display Modes
 April 27, 2014, 07:07 Modeling internal flow with normal velocities on walls- permeable walls #1 New Member   Ali Madayen Join Date: Apr 2014 Posts: 22 Rep Power: 3 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

 April 27, 2014, 18:27 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,824 Rep Power: 85 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.

 April 27, 2014, 18:35 #3 New Member   Ali Madayen Join Date: Apr 2014 Posts: 22 Rep Power: 3 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.

 April 27, 2014, 18:55 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,824 Rep Power: 85 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 likes this.

 April 27, 2014, 19:05 #5 New Member   Ali Madayen Join Date: Apr 2014 Posts: 22 Rep Power: 3 Real Smart. I will try it for sure

 April 27, 2014, 19:06 #6 New Member   Ali Madayen Join Date: Apr 2014 Posts: 22 Rep Power: 3 Real smart, I will try it for sure Thanks a lot, friend.

 Tags normal velocity, permeable wall

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post CFDnewbie147 OpenFOAM Native Meshers: snappyHexMesh and Others 1 October 22, 2013 09:53 umar959 FLUENT 0 November 15, 2011 04:32 idir CFX 8 September 16, 2011 06:40 Franny Main CFD Forum 13 July 7, 2007 15:57 DS & HB Main CFD Forum 0 January 8, 2000 16:00

All times are GMT -4. The time now is 09:08.

 Contact Us - CFD Online - Top