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-   -   [MATLAB] FFT of Velocity Time Series (http://www.cfd-online.com/Forums/main/86805-matlab-fft-velocity-time-series.html)

ozzythewise April 2, 2011 14:21

[MATLAB] FFT of Velocity Time Series
 
Hello all,

I'm looking to create a frequency spectra of energy to show that I am in fact resolving down to the Kolmogorov scales. I have saved velocity values at each time step, but from there I'm sort of confused. I know how to do a fast fourier transform in matlab, but am really not sure how I go about creating the plot of E vs. omega (frequency). From what I understand, I need to do the FFT, calculate the magnitude of the coefficients I receive, and then I square this to get energy? From there, how do I plot this again my frequency?

Any help would be appreciated, I've never really used matlab before and I've also never done an FFT.

Thanks in advance,
Jeff


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