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Sound radiation from a turbulent boundary layer

Sound radiation from a turbulent boundary layer
Sound radiation from a turbulent boundary layer
Sound radiation due to fluctuating viscous wall shear stresses in a plane turbulent boundary layer is investigated by a two-stage procedure using direct numerical simulation (DNS) databases for incompressible turbulent Poiseuille flow in a plane channel, at Reynolds numbers up to Re?=1440. The power spectral density of radiated pressure and spectra of sound power per unit wall area are calculated in the low Mach number limit by substituting source terms obtained from DNS into a Ffowcs Williams–Hawkings wave equation and using a half-space Green function. The same DNS data are used to predict the spectrum of turbulent boundary layer noise measured in a diffuser downstream of a fully developed channel flow [Greshilov and Mironov, Sov. Phys. Acoust. 29, 275 (1983)]. The measured spectrum is ~15 dB higher at low frequencies, but converges with the prediction at high frequencies.
1070-6631
098101-[4pp]
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Morfey, Christopher L.
d5f9a8d0-7d8a-4915-a522-bf49dee111f2
Sandham, Neil D.
0024d8cd-c788-4811-a470-57934fbdcf97
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Morfey, Christopher L.
d5f9a8d0-7d8a-4915-a522-bf49dee111f2
Sandham, Neil D.
0024d8cd-c788-4811-a470-57934fbdcf97

Hu, Zhiwei, Morfey, Christopher L. and Sandham, Neil D. (2006) Sound radiation from a turbulent boundary layer. Physics of Fluids, 18 (9), 098101-[4pp]. (doi:10.1063/1.2337733).

Record type: Article

Abstract

Sound radiation due to fluctuating viscous wall shear stresses in a plane turbulent boundary layer is investigated by a two-stage procedure using direct numerical simulation (DNS) databases for incompressible turbulent Poiseuille flow in a plane channel, at Reynolds numbers up to Re?=1440. The power spectral density of radiated pressure and spectra of sound power per unit wall area are calculated in the low Mach number limit by substituting source terms obtained from DNS into a Ffowcs Williams–Hawkings wave equation and using a half-space Green function. The same DNS data are used to predict the spectrum of turbulent boundary layer noise measured in a diffuser downstream of a fully developed channel flow [Greshilov and Mironov, Sov. Phys. Acoust. 29, 275 (1983)]. The measured spectrum is ~15 dB higher at low frequencies, but converges with the prediction at high frequencies.

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Submitted date: 11 January 2006
Published date: September 2006
Organisations: Aerodynamics & Flight Mechanics

Identifiers

Local EPrints ID: 41982
URI: https://eprints.soton.ac.uk/id/eprint/41982
ISSN: 1070-6631
PURE UUID: e502d3e7-a45f-4326-b6e3-0bacd0297846
ORCID for Neil D. Sandham: ORCID iD orcid.org/0000-0002-5107-0944

Catalogue record

Date deposited: 25 Oct 2006
Last modified: 15 Aug 2019 00:50

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