Pipeline Toolbox
Function Reference Manual
Early Public Release DD-00011-000

3.2.11 moody - Moody friction factor
f = moody(d,e,re)

Calculate the Moody approximation of the Colebrook-White equation in range 4000 Re 5×108 and 0 ε/D 0.01.

Arguments

d

Pipe internal diameter (m).

e

Pipe effective roughness ε.

re

Reynolds number

Returns Darcy friction factor f, dimensionless.

Possible Errors

Moody approximation only valid within 4000 <= Re <= 5e8

The given Reynolds number is out of range.

Moody approximation only valid within 0 <= e/D <= 0.01

The given pipe roughness/diameter fraction is out of range.