about wall shear stress

shoushibo · April 28, 2010, 12:23

the flow of liquid on structured wall is treated. from the plot of velocity vector, the eddy near the wall appeared. but i want to verify it from the wall shear stress. the plot of wall shear stress v.s. wall is made. but all the stress is positive. i think some of these should be negative. why?
and how can i get the velocity gradient normal to the wall?

shoushibo · May 7, 2010, 12:27

anyone can offered some suggestions？

Bernhard · May 8, 2010, 08:01

Only the magnitude of the wall shear stress shown here, directional information can be obtained from the components of the wall shear stress included as well. Good lcuk

shoushibo · May 8, 2010, 10:41

thanks for your reply. how to calculate the wall shear stress in fluent? is this the magnitude of this vector?

Bernhard · May 8, 2010, 16:10

Wall shear stress can be found under Wall fluxes or something, good luck.

shoushibo · May 9, 2010, 11:33

i know the position of wall shear stress. but do not know how to calculate it in fluent. please give some explanations.

April 28, 2010, 12:23	about wall shear stress	#1
shoushibo New Member shoushibo Join Date: Jun 2009 Posts: 21 Rep Power: 17	the flow of liquid on structured wall is treated. from the plot of velocity vector, the eddy near the wall appeared. but i want to verify it from the wall shear stress. the plot of wall shear stress v.s. wall is made. but all the stress is positive. i think some of these should be negative. why? and how can i get the velocity gradient normal to the wall?

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May 7, 2010, 12:27		#2
shoushibo New Member shoushibo Join Date: Jun 2009 Posts: 21 Rep Power: 17	anyone can offered some suggestions？

May 8, 2010, 08:01		#3
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 22	Only the magnitude of the wall shear stress shown here, directional information can be obtained from the components of the wall shear stress included as well. Good lcuk

May 8, 2010, 10:41		#4
shoushibo New Member shoushibo Join Date: Jun 2009 Posts: 21 Rep Power: 17	thanks for your reply. how to calculate the wall shear stress in fluent? is this the magnitude of this vector?

May 8, 2010, 16:10		#5
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 22	Wall shear stress can be found under Wall fluxes or something, good luck.

May 9, 2010, 11:33		#6
shoushibo New Member shoushibo Join Date: Jun 2009 Posts: 21 Rep Power: 17	i know the position of wall shear stress. but do not know how to calculate it in fluent. please give some explanations.