# Eddy velocity

From AMS Glossary

(Redirected from Fluctuation velocity)

## eddy velocity

(

*Also called*fluctuation velocity.) The difference between the mean velocity of fluid flow and the instantaneous velocity at a point.For example, where

*u*is the eddy velocity, is instantaneous velocity, and*U*is mean velocity. Over the same interval that defines the mean velocity, the average value of the eddy velocity is necessarily zero.