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

Quantifying Recirculation Region

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 31, 2014, 23:50
Question Quantifying Recirculation Region
  #1
Senior Member
 
Ashkan Javadzadegan
Join Date: Sep 2010
Posts: 245
Rep Power: 9
ashtonJ is on a distinguished road
Dear all,
I am looking for a method to quantify flow recirculation zone.
I have modelled blood flow in several arteries and need to compare the amount of recirculated flow regions in these arteries.
If anybody knows how to quantify the recirculation zone, please let me know.

Thanks
AshtonJ
ashtonJ is offline   Reply With Quote

Old   September 3, 2014, 06:17
Default
  #2
Senior Member
 
flotus1's Avatar
 
Alex
Join Date: Jun 2012
Location: Germany
Posts: 1,311
Rep Power: 22
flotus1 will become famous soon enoughflotus1 will become famous soon enough
The end of a recirculation zone next to a wall is usually defined using the change of sign of the wall shear stress.
flotus1 is offline   Reply With Quote

Old   July 12, 2015, 21:52
Default
  #3
Senior Member
 
Ashkan Javadzadegan
Join Date: Sep 2010
Posts: 245
Rep Power: 9
ashtonJ is on a distinguished road
Thank Alex.

CFD-Post plots doesn't give you the direction of WSS (WSS values are always positive)

Do you know how to determine the direction of WSS in CFD-Post?
ashtonJ is offline   Reply With Quote

Old   July 13, 2015, 04:25
Default
  #4
Senior Member
 
flotus1's Avatar
 
Alex
Join Date: Jun 2012
Location: Germany
Posts: 1,311
Rep Power: 22
flotus1 will become famous soon enoughflotus1 will become famous soon enough
You might be looking at the magnitude of the wall shear stress. In this case a local minimum with a value of zero (or very close to it) is equivalent for intrinsically two-dimensional setups like a backward facing step.

When I was talking about sign change, I was referring to the individual components of the wall shear stress vector
\tau_{w,i} = \left. \mu \frac{\partial u_i}{\partial y} \right|_{y=0}
where y is in normal direction of the wall.

Last edited by flotus1; July 13, 2015 at 05:28.
flotus1 is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Unstabil Simulation with chtMultiRegionFoam mbay101 OpenFOAM Running, Solving & CFD 13 December 28, 2013 14:12
Using starToFoam clo OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 33 September 26, 2012 04:04
what is difference between recirculation region, eddy field and vortex? fruitkiwi Main CFD Forum 7 May 30, 2012 04:20
StarToFoam error Kart OpenFOAM Meshing & Mesh Conversion 1 February 4, 2010 05:38
Import gmsh msh to Foam adorean Open Source Meshers: Gmsh, Netgen, CGNS, ... 24 April 27, 2005 08:19


All times are GMT -4. The time now is 00:06.