# Wall Shear Stress

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 July 2, 2013, 22:41 Wall Shear Stress #1 Member   Join Date: Apr 2012 Posts: 48 Rep Power: 7 Hello Guys, I just have modelled a basic 3D pipe flow with periodic boundaries. I tried to plot wall shear stress contours and also the xy plots. The flow is laminar. I am somehow not convinced with the contour and plot of wall shear stress. I have plotted them at the outlet. Can anyone comment if the plots are correct or not? Thanks. -Varad

 July 3, 2013, 06:54 #2 Senior Member     Alex Join Date: Jun 2012 Location: Germany Posts: 1,579 Rep Power: 25 Since the WALL shear stress is only defined at the wall, evaluating it in the fluid zone will only lead to confusion. What exactly makes you doubt that the results are correct? The velocity profile looks ok if your bulk velocity is ~1 m/s.

 July 3, 2013, 14:16 #3 Member   Join Date: Apr 2012 Posts: 48 Rep Power: 7 Hii, Thanks for your reply.I was thinking of getting something like this

 July 4, 2013, 04:09 #4 Senior Member     Alex Join Date: Jun 2012 Location: Germany Posts: 1,579 Rep Power: 25 This is the shear stress . This should equal the wall shear stress at the wall (r=R). But again, the variable "WALL shear stress" in fluent (and in fluid dynamics in general) is only defined at the wall and is thus not defined in the fluid.

 July 4, 2013, 13:26 #5 Member   Join Date: Apr 2012 Posts: 48 Rep Power: 7 So how do I plot the shear stress in Fluent?

 July 5, 2013, 03:23 #6 Senior Member     Alex Join Date: Jun 2012 Location: Germany Posts: 1,579 Rep Power: 25 Among the "derivatives", you should find the velocity derivative that complies with your coordinate system. Multiply by the dynamic viscosity and thats it.

 July 5, 2013, 09:40 #7 Member   Join Date: Apr 2012 Posts: 48 Rep Power: 7 Thanks a lot for ur replies mate..

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