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

kkanadekkanade Forum Coordinator
How can I use the Froude number to analyze sea waves?
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  • 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.

  • kkanadekkanade Forum Coordinator

    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.

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