Calculating energy/power spectra.
Posted October 10, 2020 at 13:50 by MikeBravo
Calculating Spectra:
Quote:
Originally Posted by FMDenaro
Well, I suggest to do the FFT of the three velocity
components at the chosed position. However, you need a correct windowing technique as your signal is not necessarily periodic in time. Then, consider that depending on the position far from the cylinder along the wake, you can or not recover the theoretical inertial slope. Furthermore, the theoretical slope should be the same, interchanging in space and time, requiring further assumption about ergodicity.
Finally, I would suggest to do the spectral analysis also in space, you can do the FFT along z and for several positions along the streamwise direction
components at the chosed position. However, you need a correct windowing technique as your signal is not necessarily periodic in time. Then, consider that depending on the position far from the cylinder along the wake, you can or not recover the theoretical inertial slope. Furthermore, the theoretical slope should be the same, interchanging in space and time, requiring further assumption about ergodicity.
Finally, I would suggest to do the spectral analysis also in space, you can do the FFT along z and for several positions along the streamwise direction
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