# Skin friction coefficient

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 January 24, 2013, 18:56 Skin friction coefficient #1 Senior Member     Meimei Wang Join Date: Jul 2012 Posts: 492 Rep Power: 7 Hi, I'm looking for the skin friction coefficient formula that CFX uses. But I didn't find it on user manual. Could you please tell me which skin friction coefficient formula does CFX use? Thank you very much! __________________ Best regards, Meimei

 January 25, 2013, 11:51 #2 Senior Member   Edmund Singer P.E. Join Date: Aug 2010 Location: Minneapolis, MN Posts: 494 Rep Power: 10 tau_wall/(1/2*rho*Uinf^2)? Not sure what you mean. Do you mean how do they get tau_wall?

January 25, 2013, 19:08
#3
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Meimei Wang
Join Date: Jul 2012
Posts: 492
Rep Power: 7
Quote:
 Originally Posted by singer1812 tau_wall/(1/2*rho*Uinf^2)? Not sure what you mean. Do you mean how do they get tau_wall?
Yes. I guess it compute tau_wall by this

http://www.cfd-online.com/Wiki/Wall_shear_stress

But does it just set the fluid velocity at the wall as 0 then compute the (du/dy)_{y=0}? But how does it know du/dy at the wall(y=0) without knowing the wall shear stress in advance?
__________________
Best regards,
Meimei

 January 28, 2013, 10:25 #4 Senior Member   Edmund Singer P.E. Join Date: Aug 2010 Location: Minneapolis, MN Posts: 494 Rep Power: 10 That can be a complicated discussion. I suggest looking at chapter 2 of the CFX Theory Guide.

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