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Skin Friction Coefficient ($C_f$)
Skin Friction Coefficient ($C_f$)
A dimensionless measure of the shear stress exerted by the fluid on the surface. It is defined as
C
f
=
τ
w
1
2
ρ
U
2
C_f = \frac{\tau_w}{\frac{1}{2}\rho U^2}
C
f
=
2
1
ρ
U
2
τ
w
, where
τ
w
\tau_w
τ
w
is the wall shear stress.