# wall shear stress tensor

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

 January 8, 2015, 08:22 wall shear stress tensor #1 Member   Mohamad Alagheband Join Date: Oct 2012 Posts: 41 Rep Power: 5 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 CFD-post. Am i missing something or those component are principal ones?

 January 8, 2015, 11:53 #2 Senior Member   Join Date: Jun 2009 Posts: 403 Rep Power: 11 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 non-polar 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, AshwaniAssam likes this.

January 8, 2015, 15:25
#3
Member

Join Date: Oct 2012
Posts: 41
Rep Power: 5
Quote:
 Originally Posted by Opaque 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 non-polar 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,
I really appreciate your reply,and that was helpful,then what does Wall Shear X,Y and Z exactly mean? sorry if it's stupid question

 January 8, 2015, 16:58 #4 Senior Member   Join Date: Jun 2009 Posts: 403 Rep Power: 11 T = stress vector = force vector per unit area T_tangential = tangential force vector per unit area = Wall Shear Vector AshwaniAssam likes this.

January 9, 2015, 03:34
#5
Member

Join Date: Oct 2012
Posts: 41
Rep Power: 5
Quote:
 Originally Posted by Opaque T = stress vector = force vector per unit area T_tangential = tangential force vector per unit area = Wall Shear Vector
Thanks again
my real question is how can I find T_xy or other component, in CFD-post i just got Wall Shear X,Y and Z

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post gotang FLUENT 0 September 15, 2014 10:35 123catty456 Main CFD Forum 1 October 1, 2012 22:27 warlocklw Main CFD Forum 2 May 21, 2012 06:16 winter FLUENT 0 December 11, 2007 18:11 Francois FLUENT 0 July 7, 2005 11:15

All times are GMT -4. The time now is 10:36.