FLUENT-FFT ANALYSIS-STROUHAL NUMBER

- March 6, 2022 at 4:54 pm
  
  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.
- March 6, 2022 at 4:55 pm
  
  mimozas1
  Subscriber
- March 6, 2022 at 4:56 pm
  
  mimozas1
  Subscriber
- March 6, 2022 at 4:57 pm
  
  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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