Fluids

Fluids

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

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    • Keyur Kanade
      Ansys Employee
      How can I use the Froude number to analyze sea waves?
    • Karthik R
      Administrator

      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.


    • Keyur Kanade
      Ansys Employee

      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?

    • Karthik R
      Administrator

      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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