Abstract
Progress in the prediction and control of flow generated noise over the past four decades is described in relation to developments in the descriptive modelling of the vortical structures in free and confined turbulence, that are responsible for its generation. Their controlling influence on sound emission at low Mach numbers, with the influence of acoustic feedback on their development, are both illustrated with specific reference to jet noise, engine breathing noise, plant noise and the voicing of vowels.
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