Wall shear stress due to roughness -- CFD Online Discussion Forums

October 27, 2014, 05:28	Wall shear stress due to roughness	#1
tsram90 Member Join Date: Oct 2011 Posts: 80 Rep Power: 15	I am trying to measure the forces acting on a rough pipe surface due to a flow. My problem is that i am getting same results of shear stress whether I use a smooth pipe or when I give a roughness value (.0015mm) in wall boundary conditions. Since the wall is rough I should get a higher shear stress right? Is it something related to slip velocity?

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