In fluid mechanics, the Roshko number (Ro) is a dimensionless number describing oscillating flow mechanisms. It is named after the American Professor of Aeronautics Anatol Roshko. It is defined as

where

Correlations

Roshko determined the correlation below from experiments on the flow of air around circular cylinders over range Re=50 to Re=2000:

valid over [ 50 <= Re < 200]
valid over [200 <= Re < 2000]

Ormières and Provansal investigated vortex shedding in the wake of a sphere and found a relationship between Re and Ro in the range 280 < Re < 360.


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