Aerodynamic Noise

In architecture, aerodynamic noise is the term applied to noise which results from the flow of air. Aerodynamic noise is often generated in an air-conditioning system when the flowing air encounters protuberances, rough surfaces or blunt edges.
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Aerodynamic Noise

Sound generated by turbulent flow is just as if the field were generatedby a distribution of quadrupole sources (Lighthill, 'On sound generatedaerodynamically, I. General theory.', 1952, Proc. Roy. Soc. London A 211, 564).Lighthill rearranged the basic equations of fluid dynamics to show this exact analogy.The frequency content is roughly determine...
Found on http://www.diracdelta.co.uk/science/source/a/e/aerodynamic%20noise/source.h
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