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Summary

ESDU CFM calculates the local and mean skin friction coefficients for a turbulent boundary layer on a smooth flat plate with zero pressure gradient.

Full details of the Derivation of the method and its application are given in ESDU 68020 in the ESDU Aerodynamics Series.

Definitions

$R _{x}$ Reynolds Number based on distance measured from virtual origin of the turbulent boundary layer
$M _{1}$ Mach number at edge of boundary layer
$C _{F}$ Mean skin friction coefficient
$C _{f}$ Local skin friction coefficient

Limits

Reynolds number

$$(R_{x})_{min} \le R_x \le 10^9 $$

$(R_{x})_{min}$ is defined as $$(R_x)_{min} = {10^5 \over F_{M2}}$$ where $$F_{M2} = {[ 1 + 0.178 {M_1}^2 ]^{-0.702} \over F_{M1} }$$ and $$F_{M1} = { {0.178 {M_1}^2} \over { [ \tan^{-1} (0.4219 M_1)]^2 }}$$

See Eqn (A2.5) from ESDU 68020.

Mach number
Mach number must lie in the range $$0 \le M_{1} \le 5$$
Results : Warning - the input has changed! Rerun the calculation
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