# Rossby Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

## Rossby Number

Roosby number ( $$Ro$$ ) (dimensionless number) used in describing fluid flow. It is the ratio of internal to Coriolis force.

### Rossby Number Formula

$$Ro = \frac{ U } { L f}$$

Where:

$$Ro$$ = Roosby Number

$$U$$ = characteristic velocity

$$L$$ = characteristic length

$$f$$ = Coriolis frequency