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-   -   [Paraview] Wall Shear Stress (http://www.cfd-online.com/Forums/openfoam-post-processing/73307-paraview-wall-shear-stress.html)

-mAx- March 4, 2010 06:45

[Paraview] Wall Shear Stress
 
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

philippose March 4, 2010 08:27

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

-mAx- March 4, 2010 08:47

yes I saw this utility just after I posted the thread.
I am working on it.
Thanks for the confirmation
;)

idrama April 15, 2010 03:49

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

-mAx- April 15, 2010 04:19

It comes from the stress tensor, ie a matrix:
http://en.wikipedia.org/wiki/Stress_(mechanics)


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