Hello Ahmet,
What kind of flow features are you looking to plot? There are two main types of spectral analysis tools for acoustics:
1) FFT analysis/plotting for point data (.out files or imported unsteady data)
2) FFT analysis for surface data (FW-H .asd files only)
Did you set up solution monitors during your simulations and wrote the data to .out files (e.g. for pressure fluctuations at a point of interest)?
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