Froude number
The Froude number is the reciprocal of the square root of the
Richardson number.
It is usually used in the context of the Boussinesq approximation and
is defined as
where  is a representative speed, g' the reduced gravity
(see Boussinesq approximation), and  a representative
vertical lengthscale. Strictly, this is known as the densimetric Froude
number.
It is usually used by modellers who wish to nondimensionalize a speed.
For example, the leading edge of a gravity current moves with a front
Froude number of about unity.
Referenced By
Dimensionless Number | Dimensionless parameter | Fluid Dynamics | Fluid Mechanics | Gravity current | Liquid mechanics | Mechanics of fluids | Richardson number
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