Aeroacoustic problem
 

Anyone here has solved the problem involving prediction of flow noise? In STAR we can predict the noise sources (called AA sources-dimensionless) by switching on some real constants. How to get the frequency band or db level sound output? If we can do FFT (fast Fourier transform) which time domain data (pressure, velocity etc) is required to convert it to frequency domain? Help requested, since my knowledge in acoustics is very primitive. Thanks.