# How can I use the Froude number to analyze sea waves?

kkanade
Forum Coordinator

How can I use the Froude number to analyze sea waves?

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kkanade
Forum Coordinator

How can I use the Froude number to analyze sea waves?

Tagged:

## Comments

Hi @kkanade ,

For shallow water waves applications, the Froude number is used to define three flow conditions:

-subcritical (Fr<1), the water velocity < wave velocity, namely downstream conditions affect the upstream flow;

-critical (Fr=1), the water velocity = wave velocity, upstream waves remain stationary;

-supercritical (Fr>1), the water velocity > wave velocity, namely upstream flow is not affected by the downstream conditions.

Thank you! @Kremella

I have another question, Since the Froude number is defined as:

Fr = V/sqrt(g*L)

where V is the characteristic velocity, g is the characteristic external field, L is the characteristic length. What should I use for V, g and L?

Hi @kkanade ,

In your case, V is the average flow velocity, g is the gravitational acceleration and L is the flow depth.