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

Seungtae Hwang, Young June Moon

Research output: Contribution to journalArticle

3 Citations (Scopus)

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).

Original languageEnglish
Pages (from-to)48-55
Number of pages8
JournalInternational Journal of Aeronautical and Space Sciences
Volume18
Issue number1
DOIs
Publication statusPublished - 2017 Mar 1

Fingerprint

Pipe flow
Large eddy simulation
Acoustic noise
Acoustics
Power spectrum
Aeroacoustics
Power spectral density
Channel flow
Buffer layers
Shear stress
Boundary layers
Vortex flow
Acoustic waves

Keywords

  • Computational aeroacoustics
  • Low-subsonic
  • Turbulent bursts
  • Turbulent pipe flow noise

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Materials Science(all)
  • Aerospace Engineering
  • Electrical and Electronic Engineering

Cite this

On the computation of low-subsonic turbulent pipe flow noise with a hybrid LES/LPCE method. / Hwang, Seungtae; Moon, Young June.

In: International Journal of Aeronautical and Space Sciences, Vol. 18, No. 1, 01.03.2017, p. 48-55.

Research output: Contribution to journalArticle

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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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