On the computation of low-subsonic turbulent pipe flow noise with a hybrid LES/LPCE method

Seungtae Hwang; Young J. Moon

doi:10.5139/IJASS.2017.18.1.48

On the computation of low-subsonic turbulent pipe flow noise with a hybrid LES/LPCE method

Seungtae Hwang, Young J. Moon

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Aeroacoustic computation of a fully-developed turbulent pipe flow at Re_τ = 175 and M = 0.1 is conducted by LES/LPCE hybrid method. The generation and propagation of acoustic waves are computed by solving the linearized perturbed compressible equations (LPCE), with acoustic source DP(x,t)/Dt attained by the incompressible large eddy simulation (LES). The computed acoustic power spectral density is closely compared with the wall shear-stress dipole source of a turbulent channel flow at Re_τ = 175. A constant decaying rate of the acoustic power spectrum, f^-8/5 is found to be related to the turbulent bursts of the correlated longitudinal structures such as hairpin vortex and their merged structures (or hairpin packets). The power spectra of the streamwise velocity fluctuations across the turbulent boundary layer indicate that the most intensive noise at ω⁺ < 0.1 is produced in the buffer layer with fluctuations of the longitudinal structures (k_zR < 1.5).

Original language	English
Pages (from-to)	48-55
Number of pages	8
Journal	International Journal of Aeronautical and Space Sciences
Volume	18
Issue number	1
DOIs	https://doi.org/10.5139/IJASS.2017.18.1.48
Publication status	Published - 2017 Mar

Bibliographical note

Funding Information:
This work was supported by KISTI Supercomputing Center, Daejun, Korea under the HPC Applied Research Supporting Program (No. KSC-2013-G2-004). The authors would like to thank their support and consideration.

Publisher Copyright:
© The Korean Society for Aeronautical & Space Sciences.

Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

Keywords

Computational aeroacoustics
Low-subsonic
Turbulent bursts
Turbulent pipe flow noise

ASJC Scopus subject areas

Control and Systems Engineering
General Materials Science
Aerospace Engineering
Electrical and Electronic Engineering

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10.5139/IJASS.2017.18.1.48

Cite this

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title = "On the computation of low-subsonic turbulent pipe flow noise with a hybrid LES/LPCE method",

abstract = "Aeroacoustic computation of a fully-developed turbulent pipe flow at Reτ = 175 and M = 0.1 is conducted by LES/LPCE hybrid method. The generation and propagation of acoustic waves are computed by solving the linearized perturbed compressible equations (LPCE), with acoustic source DP(x,t)/Dt attained by the incompressible large eddy simulation (LES). The computed acoustic power spectral density is closely compared with the wall shear-stress dipole source of a turbulent channel flow at Reτ = 175. A constant decaying rate of the acoustic power spectrum, f-8/5 is found to be related to the turbulent bursts of the correlated longitudinal structures such as hairpin vortex and their merged structures (or hairpin packets). The power spectra of the streamwise velocity fluctuations across the turbulent boundary layer indicate that the most intensive noise at ω+ < 0.1 is produced in the buffer layer with fluctuations of the longitudinal structures (kzR < 1.5).",

keywords = "Computational aeroacoustics, Low-subsonic, Turbulent bursts, Turbulent pipe flow noise",

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note = "Funding Information: This work was supported by KISTI Supercomputing Center, Daejun, Korea under the HPC Applied Research Supporting Program (No. KSC-2013-G2-004). The authors would like to thank their support and consideration. Publisher Copyright: {\textcopyright} The Korean Society for Aeronautical & Space Sciences. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.",

year = "2017",

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doi = "10.5139/IJASS.2017.18.1.48",

language = "English",

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PY - 2017/3

Y1 - 2017/3

N2 - Aeroacoustic computation of a fully-developed turbulent pipe flow at Reτ = 175 and M = 0.1 is conducted by LES/LPCE hybrid method. The generation and propagation of acoustic waves are computed by solving the linearized perturbed compressible equations (LPCE), with acoustic source DP(x,t)/Dt attained by the incompressible large eddy simulation (LES). The computed acoustic power spectral density is closely compared with the wall shear-stress dipole source of a turbulent channel flow at Reτ = 175. A constant decaying rate of the acoustic power spectrum, f-8/5 is found to be related to the turbulent bursts of the correlated longitudinal structures such as hairpin vortex and their merged structures (or hairpin packets). The power spectra of the streamwise velocity fluctuations across the turbulent boundary layer indicate that the most intensive noise at ω+ < 0.1 is produced in the buffer layer with fluctuations of the longitudinal structures (kzR < 1.5).

AB - Aeroacoustic computation of a fully-developed turbulent pipe flow at Reτ = 175 and M = 0.1 is conducted by LES/LPCE hybrid method. The generation and propagation of acoustic waves are computed by solving the linearized perturbed compressible equations (LPCE), with acoustic source DP(x,t)/Dt attained by the incompressible large eddy simulation (LES). The computed acoustic power spectral density is closely compared with the wall shear-stress dipole source of a turbulent channel flow at Reτ = 175. A constant decaying rate of the acoustic power spectrum, f-8/5 is found to be related to the turbulent bursts of the correlated longitudinal structures such as hairpin vortex and their merged structures (or hairpin packets). The power spectra of the streamwise velocity fluctuations across the turbulent boundary layer indicate that the most intensive noise at ω+ < 0.1 is produced in the buffer layer with fluctuations of the longitudinal structures (kzR < 1.5).

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KW - Turbulent pipe flow noise

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On the computation of low-subsonic turbulent pipe flow noise with a hybrid LES/LPCE method

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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