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shear stress calculation on the surface of cylinder

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Old   March 17, 2011, 00:51
Default shear stress calculation on the surface of cylinder
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I have written a code to solve compressible flow over 2 D cylinder....

i want to know how can i calculate the shear stress on the surface....

i need it to ultimately find the drag of the cylinder....

any help will be helpful.....i have the pressure values, and u and v values r there ....

step by step instruction will help me in order to obtain the shear stress on the surface of the cylinder....

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Old   March 26, 2011, 08:05
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Total drag mainly consists of pressure drag + viscous drag(shear)
finding pressure drag (Fx) is very simple equal to sum of (pressure x area) for all wall faces along X direction.
To find shear stress you need rate of deformation tensor. Multiplying this with viscosity will give you stress tensor ( laminar assumption) . That you can convert into forces along x dircetion multyplying by correcsoding area.
The link below will help you to find stress tensor

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