Fluids

Fluids

FLUENT-FFT ANALYSIS-STROUHAL NUMBER

    • mimozas1
      Subscriber

      Hallo everybody!

      I am conducting a 2D DES simullation of an airfoil at 90degrees AoA. I am trying to calculate the Strouhal number of the flow. I tend on using the CD value and its pertubations to find the Vortex Shedding Frequency.

      When i plot the Magnitude (y axis) vs Strouhal number (x axis) plot i get something like that.

    • mimozas1
      Subscriber

    • mimozas1
      Subscriber

    • mimozas1
      Subscriber
      We should not focus on the validity of the results since the Edy Lenghts i resolve is not the ideal.
      The think i would like to know is how to interpret this graph to find correctly the Strhl number of the flow.
      One idea i have taken from YouTube tutorials is to export the points of the graph to an Excel Sheet and then find the average of the X axis (Strhl numb.) But i am not sure if this is the correct way.
      Another idea is to take into acount only the peak of the curve, but again i think this is wrong.
      Does anyone have an idea on how to get the info out of an FFT graph correctly?

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