Learning Forum

[HUgo9527]

I am using Ffowcs William & Hawkings method to simulate the sound pressure level of the propeller. However, I can only get the dB from 0.5Hz to 1 Hz, which is completely useless for me. I want a more extensive range of frequency. It shows zero sizes or size mismatch for x/y values when I try to take other data bigger than 1Hz. Did I do something wrong?

[Konstantin]

Hello Can you check what FW-H gives you in terms of time signal output? Go to Acoustics signal, and compute an acoustic signal at some far-field location, e. g. 1 m on the axis upstream of the fan. This will be acoustic pressure vs time. The do the FFT on the signal to see what the narrow-band spectrum is. Please share both plots of time signal and FFT.