I have a question about FFT in Diadem. The output of FTT function is frequency (f) in Hz, is there any way to get the output in angular frequency ω? The equation would be ω = 2*pi*f where f is the frequency.
Furthermore is there any way to plot the FTT output in wavenumber (k) domain provided that
k*U = 2*pi*f = ω
where U is the mean velocity that I can easily calculate?