# Richardson Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Richardson number, abbreviated as Ri, a dimensionless number, is the ratio of the buoyancy term to the flow shear term.

## Richardson Number formula

 $$\large{ f = \frac{ Gr }{ Re^2 } }$$

### Where:

 Units English Metric $$\large{ Ri }$$ = Richardson number $$\large{dimensionless}$$ $$\large{ Gr }$$ = Grashof number $$\large{dimensionless}$$ $$\large{ Re }$$ = Reynolds number $$\large{dimensionless}$$