[Paraview] Wall Shear Stress

-mAx- · March 4, 2010, 05:45

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, 07:27

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, 07:47

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)

silviliril · August 30, 2019, 10:30

Here is what you need to do:
run the following command in terminal:

Code:

simpleFoam -postProcess -func wallShearStress

The simpleFoam can be replaced with whatever solver you are using.

March 4, 2010, 05:45	[Paraview] Wall Shear Stress	#1
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	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

March 4, 2010, 07:27		#2
philippose Senior Member Philippose Rajan Join Date: Mar 2009 Location: Germany Posts: 552 Rep Power: 25	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 mizzou, amuzeshi, bkay and 1 others like this.

March 4, 2010, 07:47		#3
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	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

April 15, 2010, 04:19		#5
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	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

August 30, 2019, 10:30		#6
silviliril Member L S Join Date: Apr 2016 Posts: 63 Rep Power: 10	Here is what you need to do: run the following command in terminal: Code: simpleFoam -postProcess -func wallShearStress The simpleFoam can be replaced with whatever solver you are using. rarnaunot, huangzhaoyuan and aeronerd like this.

April 15, 2010, 03:49		#4
idrama Senior Member Claus Meister Join Date: Aug 2009 Location: Wiesbaden, Germany Posts: 241 Rep Power: 17	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

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