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Flow filtering and the physical sources of aerodynamic sound

Flow filtering and the physical sources of aerodynamic sound
Flow filtering and the physical sources of aerodynamic sound
The physical sources of sound are expressed in terms of the non-radiating part of the flow. The non-radiating part of the flow can be obtained from convolution filtering, as we demonstrate numerically by using an axi-symmetric jet satisfying the Navier–Stokes equations. Based on the frequency spectrum of the source, we show that the sound sources exhibit more physical behaviour than sound sources based on acoustic analogies. To validate the sources of sound, one needs to let them radiate within the non-radiating flow field. However, our results suggest that the traditional Euler operator linearized about the time-averaged part of the flow should be sufficient to compute the sound field.

aerodynamic sound, flow filtering, sound sources, physical sources
94-103
Sinayoko, Samuel
0e4346ca-1a26-481d-8241-f83730f6b0e4
Agarwal, Anurag
f63a9325-bd24-4341-8727-42a87cc5a163
Sinayoko, Samuel
0e4346ca-1a26-481d-8241-f83730f6b0e4
Agarwal, Anurag
f63a9325-bd24-4341-8727-42a87cc5a163

Sinayoko, Samuel and Agarwal, Anurag (2010) Flow filtering and the physical sources of aerodynamic sound. [in special issue: IUTAM Symposium on Computational Aero-Acoustics for Aircraft Noise Prediction] Procedia Engineering, 6, 94-103. (doi:10.1016/j.proeng.2010.09.011).

Record type: Article

Abstract

The physical sources of sound are expressed in terms of the non-radiating part of the flow. The non-radiating part of the flow can be obtained from convolution filtering, as we demonstrate numerically by using an axi-symmetric jet satisfying the Navier–Stokes equations. Based on the frequency spectrum of the source, we show that the sound sources exhibit more physical behaviour than sound sources based on acoustic analogies. To validate the sources of sound, one needs to let them radiate within the non-radiating flow field. However, our results suggest that the traditional Euler operator linearized about the time-averaged part of the flow should be sufficient to compute the sound field.

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More information

Published date: March 2010
Venue - Dates: IUTAM Symposium on Computational Aero-Acoustics for Aircraft Noise Prediction, Southampton, United Kingdom, 2010-03-29 - 2010-03-31
Keywords: aerodynamic sound, flow filtering, sound sources, physical sources

Identifiers

Local EPrints ID: 173005
URI: http://eprints.soton.ac.uk/id/eprint/173005
PURE UUID: 9a3b9e29-1278-4a00-8a71-480ebd92e24f

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Date deposited: 01 Feb 2011 11:56
Last modified: 14 Mar 2024 02:30

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Contributors

Author: Samuel Sinayoko
Author: Anurag Agarwal

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