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Where does aero wheels noise come from?

One time I hear someone said, with satisfaction, that his aero wheels sound awesome. I wonder where does the noise come from, is it because you ride so fast the pushed air makes the noise or is it ...
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Accurately replicating the resistance felt whilst riding via a resistance fan diy turbo trainer

If I were to build my own Lemond Revolution style turbo trainer (link below) could I use the air speed in meters/second^2 the rider is moving into as a good indicator of what type and size of fan to ...