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

[Paraview] Wall Shear Stress

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 4, 2010, 06:45
Default [Paraview] Wall Shear Stress
  #1
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,992
Rep Power: 30
-mAx- will become famous soon enough
Hi, I was wondering if there is a possibility to display the wall shear stress on a wall.
Since the velocity on my wall is 0, I cannot compute any gradient of U for defining the shear stress as: TAU = MU . du/dn
I assume there is a turnaround...
Any idea or experience?
Thanks in advance
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   March 4, 2010, 08:27
Default
  #2
Senior Member
 
Philippose Rajan
Join Date: Mar 2009
Location: Germany
Posts: 530
Rep Power: 16
philippose will become famous soon enough
Hello Maxime,

A Good Afternoon to you :-)!

There is a utility in OpenFOAM called "wallShearStress".... this utility should be run in your case folder as follows:

> wallShearStress -latestTime <<----- In case you want only the last time step

> wallShearStress -time <time> <<----- For a specific iteration

> wallShearStress <<----- For all time steps

The utility writes a field to each time step called "wallShearStress", which can be directly post-processed in Paraview like you post-process any other field....

Hope this helps :-)!

Enjoy!

Philippose
philippose is online now   Reply With Quote

Old   March 4, 2010, 08:47
Default
  #3
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,992
Rep Power: 30
-mAx- will become famous soon enough
yes I saw this utility just after I posted the thread.
I am working on it.
Thanks for the confirmation
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   April 15, 2010, 03:49
Default
  #4
Senior Member
 
Claus Meister
Join Date: Aug 2009
Location: Wiesbaden, Germany
Posts: 241
Rep Power: 9
idrama is on a distinguished road
Hello mAx,

the formular tau=mu*dc/dn from did you get that. For my work, I need a three dimension citation of that formular and not tau = mu du/dy.

cheers
idrama is offline   Reply With Quote

Old   April 15, 2010, 04:19
Default
  #5
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,992
Rep Power: 30
-mAx- will become famous soon enough
It comes from the stress tensor, ie a matrix:
http://en.wikipedia.org/wiki/Stress_(mechanics)
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- 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
Fluid wall shear stress Sinead Kelly (Kelly) OpenFOAM Running, Solving & CFD 2 March 30, 2011 06:41
Multicomponent fluid Andrea CFX 2 October 11, 2004 05:12
shear stress scalar definitions? Novak Elliott CFX 0 April 6, 2003 01:45
What is the detail definition of wall shear stress zjm FLUENT 0 January 2, 2002 08:43
Flux depending on wall shear stress in Fluent 5.2 Andreas Borg FLUENT 0 June 7, 2000 06:27


All times are GMT -4. The time now is 06:56.