# shear stress calculation on the surface of cylinder

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 March 17, 2011, 00:51 shear stress calculation on the surface of cylinder #1 Senior Member   Hassan Join Date: Apr 2009 Posts: 106 Rep Power: 8 hey 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.... thanksss

 March 26, 2011, 08:05 #2 Member   lalupp Join Date: Jul 2010 Location: India Posts: 37 Rep Power: 7 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 http://www.granular-volcano-group.or...us_stress.html

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