Rossby Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Rossby number, abbreviated as Ro, a dimensionless number, is used in describing fluid flow.  It is the ratio of internal to Coriolis force.  It is usd to characterise the importance of Coriolis accelerations due to planetary rotation.  The equation and method of calculation is shown below.


Rossby number calculator


Rossby number formula

\(\large{ Ro =  \frac{ U }{ l_c \; f} }\)   


\(\large{ Ro }\) = Rossby number

\(\large{ l_c }\) = characteristic length

\(\large{ U }\) = characteristic velocity

\(\large{ f }\) = Coriolis frequency



Tags: Equations for Flow Calculators