Relation between sound sources and vortical structures in isotropic compressible turbulence

Daiki Terakado; Taku Nonomura; Makoto Sato; Kozo Fujii

doi:10.1115/IMECE2014-37052

Relation between sound sources and vortical structures in isotropic compressible turbulence

Daiki Terakado, Taku Nonomura, Makoto Sato, Kozo Fujii

Research output: Contribution to conference › Paper › peer-review

1 Citation (Scopus)

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.

Original language	English
DOIs	https://doi.org/10.1115/IMECE2014-37052
Publication status	Published - 2014 Jan 1
Externally published	Yes
Event	ASME 2014 International Mechanical Engineering Congress and Exposition, IMECE 2014 - Montreal, Canada Duration: 2014 Nov 14 → 2014 Nov 20

Other

Other	ASME 2014 International Mechanical Engineering Congress and Exposition, IMECE 2014
Country	Canada
City	Montreal
Period	14/11/14 → 14/11/20

ASJC Scopus subject areas

Mechanical Engineering

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title = "Relation between sound sources and vortical structures in isotropic compressible turbulence",

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.",

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T1 - Relation between sound sources and vortical structures in isotropic compressible turbulence

AU - Terakado, Daiki

AU - Nonomura, Taku

AU - Sato, Makoto

AU - Fujii, Kozo

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Y1 - 2014/1/1

N2 - 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.

AB - 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.

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