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August 10, 2010, 16:34 
Shear Stress Calculation in the flow.

#1 
New Member
Janesh
Join Date: Aug 2010
Posts: 2
Rep Power: 0 
Dear Flow3d users,
I have some question about the shear stress calculation in the closed channel flow. I have a rectangular channel section and the water flows from left to right. I have used the periodic boundary conditions. I want to know the shear stress on the walls. In the software itself I didn't find any option to extract the shear stress. Is there any option to calculate shear stress, then would you good people please let me know ? If there is not any option, then I think we have a equation of shear stress as follows: Tou (shear stress) = neu * (du/dy) neu= dynamic viscosity. HOw do we use this equation with the output from Flow3d to calculate shear stress ? Any help is highly appreciated. THank you. 

August 25, 2010, 18:35 

#2 
Senior Member
Jeff Burnham
Join Date: Apr 2010
Posts: 204
Rep Power: 17 
Beginning in v9.4 of the software shear stress is an available output (as 'Excess Shear Stress', for which the threshold can be zero if total shear is desired).


August 26, 2010, 23:58 

#3 
Senior Member
michael barkhudarov
Join Date: Mar 2009
Location: Sante Fe, New Mexico, USA
Posts: 336
Rep Power: 18 
You can also output the total (integrated) shear force on the channel if you ask for this output option in the input file. This option is available for each geometry component.


November 11, 2011, 15:05 

#4 
Member
farhad
Join Date: Mar 2010
Location: Tehran
Posts: 32
Rep Power: 16 
Hi everybody,
Is there any way to calculate the shear stress in flow3d ver. 9.3.2? 

May 21, 2012, 02:50 

#5 
New Member
asadi
Join Date: Dec 2011
Posts: 5
Rep Power: 14 

April 18, 2013, 02:42 
Salam Farhad Golriz

#6 
New Member
Maziar
Join Date: Jan 2012
Posts: 6
Rep Power: 14 

April 18, 2013, 15:04 

#7 
Member
farhad
Join Date: Mar 2010
Location: Tehran
Posts: 32
Rep Power: 16 
Salam Maziar,
I do not understand what do you want to do? Do you want to model the shear stress in FLUENT? or Flow 3D? Farhad, 

April 20, 2013, 00:36 

#8 
New Member
Maziar
Join Date: Jan 2012
Posts: 6
Rep Power: 14 
Hi Farhad, I am working in the project fluent sfotware


April 20, 2013, 07:14 

#9 
Member
farhad
Join Date: Mar 2010
Location: Tehran
Posts: 32
Rep Power: 16 
You can easily see wall shear stress by this way,
Fluent > Graphics and Animations > Contours > Wall Fluxes 

December 15, 2014, 19:02 

#10 
New Member
Join Date: Dec 2014
Posts: 3
Rep Power: 11 
Hello Flow3D users,
How exactly Flow3D calculates the "Excess Shear Stress" output? Thank you for your attention. 

February 2, 2015, 10:35 

#11 
Member
liping_he
Join Date: Feb 2011
Posts: 36
Rep Power: 15 
HI JBurnham
I am using flow3d 9.3 to simulate the hydroturbine. I want to calculate the component fluid torque and force about fixed axis (a vector or X,Y,Z axis). Could you give me help to obtain these vaule？thanks very much！ best regards liping 

May 12, 2018, 13:49 
what's different between shear stress and excess shear stress in flow 3D output

#12 
New Member
Mostafa Neshastehgar
Join Date: Nov 2014
Posts: 1
Rep Power: 0 
Hello everyone
what's different between shear stress and excess shear stress in flow 3D output? 

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