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January 8, 2015, 08:22 
wall shear stress tensor

#1 
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Mohamad Alagheband
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Hi,
I am trying to find every 9 component of a stress tensor on a wall, I read the forum but I didn't get much,all I have ,is Wall Shear X,Y and Z in CFDpost. Am i missing something or those component are principal ones? 

January 8, 2015, 11:53 

#2 
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A review of the vocabulary will help:
Normal = Normal unit vector to surface of interest sigma = stress tensor at a point (9 components, 6 different ones since it should be symmetric for nonpolar fluids) T = stress vector on a point in the surface of interest = T_normal + T_tangential (3 components) How are they related ? T = sigma . Normal (this is a tensor multiplying a vector) T_normal = T . Normal T_tangential = T  ( T . Normal ) T_tangential is the Wall Shear vector. Hope the above helps, 

January 8, 2015, 15:25 

#3  
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Mohamad Alagheband
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Quote:


January 8, 2015, 16:58 

#4 
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T = stress vector = force vector per unit area
T_tangential = tangential force vector per unit area = Wall Shear Vector 

January 9, 2015, 03:34 

#5  
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Mohamad Alagheband
Join Date: Oct 2012
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Quote:
I think I ask my question badly, my real question is how can I find T_xy or other component, in CFDpost i just got Wall Shear X,Y and Z 

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