The role of large-scale structures on crackle noise

David A. Buchta, Jonathan B. Freund

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Large-scale direct numerical simulations of temporally developing turbulent mixing layers, as models for the near-nozzle shear layers of high-speeds jets, are used to examine the generation of the intense 'crackle' sound they produce. The simulations are confirmed to reproduce the well-known shock-wave-like pressure fields and peculiar pressure skewness observed for such flows. It is also confirmed that these observations are insensitive to Reynolds number. The role of the specific large-scale structure of the turbulence is investigated by a novel modification of it, motivated by the known instabilities of high-versus low-speed free shear flows. It is concluded that the structure of the turbulence has little affect on Sk.

Original languageEnglish (US)
Title of host publication22nd AIAA/CEAS Aeroacoustics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624103865
StatePublished - 2016
Event22nd AIAA/CEAS Aeroacoustics Conference, 2016 - Lyon, France
Duration: May 30 2016Jun 1 2016

Publication series

Name22nd AIAA/CEAS Aeroacoustics Conference, 2016


Other22nd AIAA/CEAS Aeroacoustics Conference, 2016

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Aerospace Engineering


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