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

3.3.2 germano_number - Germano number Gn
gn = germano_number(re,r,p,cr)

Computes the Germano number Gn given the Reynolds number Re , the helical pitch P, radius RH and the curvature ratio Cr. The Germano number is then defined as:

Gn= Re Cr2P/2πRH 1+(CrP/2πRH)2

Arguments

re

Reynolds number Re .

r

Helix radius RH (m).

p

Helix pitch p (m).

cr

Curvature ratio (dimensionless)

Returns Germano number Gn , dimensionless.