A hybrid method for aeroacoustic noise prediction of wall-bounded shear flows at low Mach numbers

J. H. Seo, Young June Moon

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

The accuracy assessments of previous viscous/acoustic splitting methods (Shen & Sorenson 1999 and Slimon et al. 1999) have been made by comparing with DaNS (Direct Acoustic Numerical Simulation) solution for a dipole tone noise generated by Karman vortex shedding from a circular cylinder at M = 0.3 and ReD = 200. The acoustic pressures are over-predicted by these methods and unexpected low frequency fluctuations are embedded. This is found not only due to the excessive generation of perturbed vorticity near and at the cylinder wall but also due to a lack of viscous diffusion term in their formulations. A modified formulation is proposed in the present study, based on the analysis of a perturbed vorticity transport equation. This equation shows a necessity of including the perturbed viscous stresses in the momentum equations to correctly handle the near field compressibility effect of wall-bounded shear flows. It also suggests a new perturbed energy equation, by which a flow noise at somewhat higher Mach numbers or a thermally driven flow noise at low Mach numbers can be handled. The present formulation yields both the far field acoustics and the compressible near field in excellent agreement with DaNS solutions.

Original languageEnglish
Title of host publication9th AIAA/CEAS Aeroacoustics Conference and Exhibit
Publication statusPublished - 2003 Dec 1
Event9th AIAA/CEAS Aeroacoustics Conference and Exhibit, 2003 - Hilton Head, SC, United States
Duration: 2003 May 122003 May 14

Other

Other9th AIAA/CEAS Aeroacoustics Conference and Exhibit, 2003
CountryUnited States
CityHilton Head, SC
Period03/5/1203/5/14

Fingerprint

noise prediction
Aeroacoustics
aeroacoustics
Shear flow
Acoustic noise
shear flow
Mach number
Acoustics
acoustics
flow noise
Vorticity
formulations
vorticity
near fields
Vortex shedding
compressibility effects
Computer simulation
Acoustic fields
Circular cylinders
Compressibility

ASJC Scopus subject areas

  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Acoustics and Ultrasonics

Cite this

Seo, J. H., & Moon, Y. J. (2003). A hybrid method for aeroacoustic noise prediction of wall-bounded shear flows at low Mach numbers. In 9th AIAA/CEAS Aeroacoustics Conference and Exhibit

A hybrid method for aeroacoustic noise prediction of wall-bounded shear flows at low Mach numbers. / Seo, J. H.; Moon, Young June.

9th AIAA/CEAS Aeroacoustics Conference and Exhibit. 2003.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Seo, JH & Moon, YJ 2003, A hybrid method for aeroacoustic noise prediction of wall-bounded shear flows at low Mach numbers. in 9th AIAA/CEAS Aeroacoustics Conference and Exhibit. 9th AIAA/CEAS Aeroacoustics Conference and Exhibit, 2003, Hilton Head, SC, United States, 03/5/12.
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