Near-field shocks radiated by high-speed free-shear-flow turbulence

David A. Buchta, Aaron T. Anderson, Jonathan B. Freund

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


Temporally developing turbulent planar free shear layers with Mach numbers M = 1:5, 2:5, and 3:5 are directly simulated to provide a geometrically simplified model of the generation of a peculiar sound, known as 'crackle'. Sound-field pressure skewness for M = 2:5 and 3:5 cases exceed Sk(p′) > 0:4, which has been correlated with perception of crackle. Statistics related to Mach wave angle and wave density indicate nonlinear interactions in the very near acoustic field in these same cases. Results show both merging of multiple waves and attening of non-planar waves into approximately planar weak shocks.

Original languageEnglish (US)
Title of host publication20th AIAA/CEAS Aeroacoustics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781624102851
StatePublished - Jan 1 2014
Event20th AIAA/CEAS Aeroacoustics Conference 2014 - Atlanta, GA, United States
Duration: Jun 16 2014Jun 20 2014

Publication series

Name20th AIAA/CEAS Aeroacoustics Conference


Other20th AIAA/CEAS Aeroacoustics Conference 2014
CountryUnited States
CityAtlanta, GA

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Near-field shocks radiated by high-speed free-shear-flow turbulence'. Together they form a unique fingerprint.

  • Cite this

    Buchta, D. A., Anderson, A. T., & Freund, J. B. (2014). Near-field shocks radiated by high-speed free-shear-flow turbulence. In 20th AIAA/CEAS Aeroacoustics Conference (20th AIAA/CEAS Aeroacoustics Conference). American Institute of Aeronautics and Astronautics Inc..