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Direct numerical simulation of turbulent flow with an impedance condition

Direct numerical simulation of turbulent flow with an impedance condition
Direct numerical simulation of turbulent flow with an impedance condition
DNS solutions for a pipe/jet configuration are re-computed with the pipe alone to investigate suppression of previously identified internal noise source(s) with an acoustic liner, using a time domain acoustic liner model developed by Tam and Auriault (AIAA Journal, 34 (1996) 913–917). Liner design parameters are chosen to achieve up to 30 dB attenuation of the broadband pressure field over the pipe length without affecting the velocity field statistics. To understand the effect of the liner on the acoustic and turbulent components of the unsteady wall pressure, an azimuthal/axial Fourier transform is applied and the acoustic and turbulent wavenumber regimes clearly identified. It is found that the spectral component occupying the turbulent wavenumber range is unaffected by the liner whereas the acoustic wavenumber components are strongly attenuated, with individual radial modes being evident as each cuts on with increasing Strouhal number.
0022-460X
28-37
Olivetti, Simone
a32f8792-2cda-41e9-ac1a-70904d894904
Sandberg, Richard D.
41d03f60-5d12-4f2d-a40a-8ff89ef01cfa
Tester, Brian J.
1bd4a793-131b-4173-93cc-3eca70b2d116
Olivetti, Simone
a32f8792-2cda-41e9-ac1a-70904d894904
Sandberg, Richard D.
41d03f60-5d12-4f2d-a40a-8ff89ef01cfa
Tester, Brian J.
1bd4a793-131b-4173-93cc-3eca70b2d116

Olivetti, Simone, Sandberg, Richard D. and Tester, Brian J. (2015) Direct numerical simulation of turbulent flow with an impedance condition. Journal of Sound and Vibration, 344, 28-37. (doi:10.1016/j.jsv.2015.01.039).

Record type: Article

Abstract

DNS solutions for a pipe/jet configuration are re-computed with the pipe alone to investigate suppression of previously identified internal noise source(s) with an acoustic liner, using a time domain acoustic liner model developed by Tam and Auriault (AIAA Journal, 34 (1996) 913–917). Liner design parameters are chosen to achieve up to 30 dB attenuation of the broadband pressure field over the pipe length without affecting the velocity field statistics. To understand the effect of the liner on the acoustic and turbulent components of the unsteady wall pressure, an azimuthal/axial Fourier transform is applied and the acoustic and turbulent wavenumber regimes clearly identified. It is found that the spectral component occupying the turbulent wavenumber range is unaffected by the liner whereas the acoustic wavenumber components are strongly attenuated, with individual radial modes being evident as each cuts on with increasing Strouhal number.

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Accepted/In Press date: 23 January 2015
e-pub ahead of print date: 16 February 2015

Identifiers

Local EPrints ID: 420783
URI: https://eprints.soton.ac.uk/id/eprint/420783
ISSN: 0022-460X
PURE UUID: f22864a4-fb89-44b0-9517-9f951e00e0aa
ORCID for Richard D. Sandberg: ORCID iD orcid.org/0000-0001-5199-3944

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Date deposited: 16 May 2018 16:30
Last modified: 20 Jul 2019 00:56

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