Models of coherent structures in turbulent jets and their radiated sound

Abstract eng:
This paper provides an overview of recent research aimed at modeling the coherent structures that comprise the dominant source of mixing noise in high-speed, turbulent jets. A trove of new data from numerical simulations and state-of-the-art measurement techniques are being fruitfully combined with computationally-enabled access to the eigenspace of large, non-normal, linear systems, in order to provide tools whereby turbulent structure and mechanism can be reliably educed, and through which quantitatively accurate models are now emerging. Beyond jet noise, these models have a role to play in controlling turbulence in a variety of free and wall-bounded shear flows.

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