ITTC-57 Friction Coefficient

Friction coefficient Cf from Reynolds number using the ITTC-57 correlation line. The foundation of every hull-resistance method that distinguishes frictional from residual resistance.

DesignResistanceITTC

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\text{Re} = \frac{V \cdot L_\text{pp}}{\nu}, \quad C_F = \frac{0.075}{(\log_{10} \text{Re} - 2)^2}

Symbol	Meaning	Unit
$\text{Re}$	Reynolds number
$V$	Ship speed	m / s
$L_\text{pp}$	Length between perpendiculars (or LWL)	m
$\nu$	Kinematic viscosity of water	m² / s
$C_F$	Frictional-resistance coefficient

Source: ITTC - *Recommended Procedures and Guidelines* (7.5-02-03); Molland, Turnock & Hudson - *Ship Resistance and Propulsion*

In short

Compute the frictional resistance coefficient Cf from Reynolds number using the ITTC-57 correlation line.

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