# Shear Stress Calculation in the flow.

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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: 9 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 Posts: 332 Rep Power: 10 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, 16:05 #4 Member   farhad Join Date: Mar 2010 Location: Tehran Posts: 32 Rep Power: 8 Hi everybody, Is there any way to calculate the shear stress in flow-3d ver. 9.3.2?

May 21, 2012, 02:50
#5
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Join Date: Dec 2011
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Quote:
 Originally Posted by MuxaB 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.
hi
how do i calculate the shear stress in flow3d v9.3?
thx

April 18, 2013, 02:42
#6
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Maziar
Join Date: Jan 2012
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Man bar roye proje fluent kar mikonam va hamin soal ra daram, mekhastam bebinam aya idea dar in zamine dari?
mamnoon!!

Quote:
 Originally Posted by golriz Hi everybody, Is there any way to calculate the shear stress in flow-3d ver. 9.3.2?

 April 18, 2013, 15:04 #7 Member   farhad Join Date: Mar 2010 Location: Tehran Posts: 32 Rep Power: 8 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: 6 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: 8 You can easily see wall shear stress by this way, Fluent ---> Graphics and Animations ---> Contours ---> Wall Fluxes

 December 15, 2014, 20:02 #10 New Member   Join Date: Dec 2014 Posts: 3 Rep Power: 3 Hello Flow3D users, How exactly Flow3D calculates the "Excess Shear Stress" output? Thank you for your attention.

 February 2, 2015, 11:35 #11 Member   liping_he Join Date: Feb 2011 Posts: 36 Rep Power: 7 HI JBurnham I am using flow3d 9.3 to simulate the hydro-turbine. 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

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