CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > CFX

Modeling internal flow with normal velocities on walls- permeable walls

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree2Likes
  • 1 Post By ghorrocks
  • 1 Post By ghorrocks

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 27, 2014, 08:07
Default Modeling internal flow with normal velocities on walls- permeable walls
  #1
New Member
 
Ali Madayen
Join Date: Apr 2014
Posts: 22
Rep Power: 12
AliMadayen is on a distinguished road
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
AliMadayen is offline   Reply With Quote

Old   April 27, 2014, 19:27
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,841
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
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.
dengdeng likes this.
ghorrocks is offline   Reply With Quote

Old   April 27, 2014, 19:35
Default
  #3
New Member
 
Ali Madayen
Join Date: Apr 2014
Posts: 22
Rep Power: 12
AliMadayen is on a distinguished road
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.
AliMadayen is offline   Reply With Quote

Old   April 27, 2014, 19:55
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,841
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
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.
ghorrocks is offline   Reply With Quote

Old   April 27, 2014, 20:05
Default
  #5
New Member
 
Ali Madayen
Join Date: Apr 2014
Posts: 22
Rep Power: 12
AliMadayen is on a distinguished road
Real Smart.
I will try it for sure
AliMadayen is offline   Reply With Quote

Old   April 27, 2014, 20:06
Default
  #6
New Member
 
Ali Madayen
Join Date: Apr 2014
Posts: 22
Rep Power: 12
AliMadayen is on a distinguished road
Real smart, I will try it for sure
Thanks a lot, friend.
AliMadayen is offline   Reply With Quote

Reply

Tags
normal velocity, permeable wall

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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 Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
[snappyHexMesh] determining displacement for added points CFDnewbie147 OpenFOAM Meshing & Mesh Conversion 1 October 22, 2013 10:53
flow modeling and incompressible analysis of internal flow of effervescent injector umar959 FLUENT 0 November 15, 2011 04:32
Modeling of water infiltration into a tank containing a permeable soil idir CFX 8 September 16, 2011 07:40
NACA0012 geometry/design software needed Franny Main CFD Forum 13 July 7, 2007 16:57
Hydrostatic pressure in 2-phase flow modeling (long) DS & HB Main CFD Forum 0 January 8, 2000 16:00


All times are GMT -4. The time now is 22:57.