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

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

Fingerprint Dive into the research topics of 'On the computation of low-subsonic turbulent pipe flow noise with a hybrid LES/LPCE method'. Together they form a unique fingerprint.

  • Cite this