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A numerical method for computation of sound radiation from an unflanged duct

A numerical method for computation of sound radiation from an unflanged duct
A numerical method for computation of sound radiation from an unflanged duct
Some issues involved in establishing a numerical model for sound radiation from a straight duct are addressed in this paper. The main ingredient of the numerical method is solutions of linearized Euler equations using a high order compact scheme. Farfield directivity is estimated through an integral solution of Ffowcs–Williams Hawkings equations. A generic test case of planar wave radiation from an unflanged duct is studied. The sound pressure level and wave propagation in the nearfield are analyzed, together with the farfield directivity. Comparison with analytical solutions shows good agreement. The effect of grid resolution on the sound radiation pattern and the construction of integration surface on the farfield directivity are discussed.
0022-460X
573-586
Chen, X.X.
1c7ce635-f117-4cb5-8f61-cb6a9b23d8a5
Zhang, X.
3056a795-80f7-4bbd-9c75-ecbc93085421
Morfey, C.L.
d5f9a8d0-7d8a-4915-a522-bf49dee111f2
Nelson, P.A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
Chen, X.X.
1c7ce635-f117-4cb5-8f61-cb6a9b23d8a5
Zhang, X.
3056a795-80f7-4bbd-9c75-ecbc93085421
Morfey, C.L.
d5f9a8d0-7d8a-4915-a522-bf49dee111f2
Nelson, P.A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9

Chen, X.X., Zhang, X., Morfey, C.L. and Nelson, P.A. (2004) A numerical method for computation of sound radiation from an unflanged duct. Journal of Sound and Vibration, 270 (3), 573-586. (doi:10.1016/j.jsv.2003.09.055).

Record type: Article

Abstract

Some issues involved in establishing a numerical model for sound radiation from a straight duct are addressed in this paper. The main ingredient of the numerical method is solutions of linearized Euler equations using a high order compact scheme. Farfield directivity is estimated through an integral solution of Ffowcs–Williams Hawkings equations. A generic test case of planar wave radiation from an unflanged duct is studied. The sound pressure level and wave propagation in the nearfield are analyzed, together with the farfield directivity. Comparison with analytical solutions shows good agreement. The effect of grid resolution on the sound radiation pattern and the construction of integration surface on the farfield directivity are discussed.

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More information

Published date: 2004
Additional Information: I.M.A. Conference on Computational Aeroacoustics, London, UK, Apr 2002

Identifiers

Local EPrints ID: 22619
URI: https://eprints.soton.ac.uk/id/eprint/22619
ISSN: 0022-460X
PURE UUID: c1db07c5-302e-4a51-80b5-4fe0dca2cd62

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Date deposited: 06 Mar 2007
Last modified: 17 Jul 2017 16:21

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