# Implementation of wall functions with a constant shear boundary condition

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 February 27, 2012, 08:49 Implementation of wall functions with a constant shear boundary condition #1 New Member   Brian Join Date: Aug 2010 Location: Southampton Posts: 12 Rep Power: 8 Howdy, I am trying to understand the implementation of wall functions in FLUENT when I specify a constant shear BC. If I just set it to be a wall I understand what happens is: 1. Take cell centre velocity and calculate u_tau from the log-law relationship. 2. Calculate tau_w and apply this as a BC at the wall. 3. Solve the N-S Eqns in the cell to calculate the new cell centre value. But what happens when I specify the wall shear stress. How does the log-law relationship get used in the calculation. Because all I can see is that you skip step one above, and just do two-three. I understand there are lots of different details that I have ignored eg u_star vs u_plus and the exact log-law relationship etc, but I just want to get my head around the application. Any input is much appreciated.

 Tags fluent, shear stress, wall function, wall shear

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