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Aeroacoustics
Aeroacoustics is a branch of acoustics that studies noise generation via either turbulent fluid motion or aerodynamic forces interacting with surfaces. Noise generation can also be associated with periodically varying flows. A notable example of this phenomenon are the Aeolian tones produced by wind blowing over fixed objects.
Although no complete scientific theory of the generation of noise by aerodynamic flows has been established, most practical aeroacoustic analysis relies upon the so-called ''aeroacoustic analogy'',〔 proposed by James Lighthill in the 1950s while at the University of Manchester.〔〔 whereby the governing equations of motion of the fluid are coerced into a form reminiscent of the wave equation of "classical" (i.e. linear) acoustics in the left-hand side with the remaining terms as sources in the right-hand side.
==History==
The modern discipline of aeroacoustics can be said to have originated with the first publication of Sir James Lighthill〔〔 in the early 1950s, when noise generation associated with the jet engine was beginning to be placed under scientific scrutiny.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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