Roshko number


In fluid mechanics, the Roshko number is a dimensionless number describing oscillating flow mechanisms. It is named after the American Professor of Aeronautics Anatol Roshko. It is defined as
where
Roshko determined the correlation below from experiments on the flow of air around circular cylinders over range Re=50 to 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.