Hello,
I have a hot-wire measurement record in the boundary layer in the wind tunnel. There should be fully developed turbulent boundary layer in the wind tunnel flow. I used Matlab to calculate the integral lentgh scale a then the non dimensional spectra. In the pictrure, I used the pspectrum function (red), Welch (cyan), Fast-Fourier transform (blue) to calculate the spectral densities. Then I added the von Karman spectrum (green), but the slope of its right part is not the same as the others. I added also the Kolmogorov inertial scale f^(-5/3) and its slope corresponds with the calculated spectrums. Do you have any ideas why the von Karman spectrum is tilted and the Kolmogorov scale is not? I am running out of ideas, thanks for help.
Sorry to say that the figures have no sense, why do you have different range of resolved frequencies?
And if you are in the BL, the flow is not homogeneos, the spectra will depends on y+.
You should clarify the way you are measuring the velocity.
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