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Plot Turbulence Spectrum Using 2D Spatial FFT |
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October 21, 2021, 07:31 |
Plot Turbulence Spectrum Using 2D Spatial FFT
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New Member
Jeffrey Johnston
Join Date: Oct 2020
Location: Belfast, Northern Ireland
Posts: 21
Rep Power: 5 |
Hello!
I am trying to replicate the results of a study (here) that performs LES of an atmospheric boundary layer. One of the results produced is a turbulence spectrum. I want to recreate this, but I'm a bit lost. Here's the description in the paper: Quote:
My second point of confusion is how to obtain a single 2-axis plot from a 2D fft. Performing a fft of the 2D array of velocity magnitudes produces a 2D array of velocity intensities. I assume that this resultant array is what the we call "wavespace"? But what is a wavevector? How do I find ones of equal magnitude and sum them? And what are the concentric rings all about? Many thanks, |
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Tags |
fft, les, spectral analysis, turbulence, waves |
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