0
$\begingroup$

I have read that because turbulence has a fractal structure then all frequencies are excited equally and that makes the familiar whistling noise.

Is this explanation correct?

Improve this question
$\endgroup$
2
  • 1
    $\begingroup$ What sort of whistling noise do you mean? Are you able to find a video on Youtube demonstrating the noise? $\endgroup$
    – Nick
    May 3, 2021 at 14:45
  • 1
    $\begingroup$ White noise is a pretty boring fractal. It's a bit like calling a straight line a fractal, since if you zoom in or zoom out it still looks like a straight line. $\endgroup$
    – Andrew
    May 3, 2021 at 17:30

1 Answer 1

Reset to default
1
$\begingroup$

Turbulent air motion is excited by a fast train and hence acoustic power is radiated by that turbulent air as a "WHOOSH" sound. Because air has mass, elasticity and compliance, extremely low and extremely high frequencies might be missing from the actual sound spectrum of a fast train, but between those extremes all frequencies will be represented.

Improve this answer
$\endgroup$
1
  • $\begingroup$ The fact that all frequencies in a range are present does not mean that the noise is "white". It's more likely that the higher frequencies are less than the large ones at the injection scale because of turbulent cascade (red spectrum). $\endgroup$
    – Quillo
    Feb 23 at 19:13

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.