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Relation Between Sound Sources and Vortical Structures in Isotropic Compressible Turbulence

[+] Author Affiliations
Daiki Terakado

The University of Tokyo, Sagamihara, Kanagawa, Japan

Taku Nonomura, Makoto Sato, Kozo Fujii

JAXA, Sagamihara, Kanagawa, Japan

Paper No. IMECE2014-37052, pp. V007T09A023; 8 pages
doi:10.1115/IMECE2014-37052
From:
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 7: Fluids Engineering Systems and Technologies
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4954-5
  • Copyright © 2014 by ASME

abstract

We investigate the relation between vortical structures and sound source in isotropic compressible turbulence by direct numerical simulations with various turbulent Mach numbers. The sound source is obtained numerically from the Lighthill equation. As a first step, we study the sound source from the Reynolds stress, which is the dominant source in flows at low Mach numbers. We investigate, especially, sound source structures around the “coherent fine scale eddies” [1–4] to lead a universal conclusion of sound generation mechanism from the fine scale structures in supersonic flows. We find that the sound source structures around the coherent fine scale eddies show some distorted structures only in high Mach number flows because shocklets appear around the fine scale eddies in those flows. This change in sound source structures around the coherent fine scale eddies does not appear in low and moderate Mach number cases.

Copyright © 2014 by ASME
Topics: Turbulence

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