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Flow decomposition and aerodynamic sound generation

Flow decomposition and aerodynamic sound generation
Flow decomposition and aerodynamic sound generation
An approximate decomposition of fluid-flow variables satisfying unbounded compressible Navier–Stokes equations into acoustically radiating and non-radiating components leads to well-defined source terms that can be identified as the physical sources of aerodynamic noise. We show that, by filtering the flow field by means of a linear convolution filter, it is possible to decompose the flow into non-radiating and radiating components. This is demonstrated on two different flows: one satisfying the linearised Euler equations and the other the Navier–Stokes equations. In the latter case, the corresponding sound sources are computed. They are found to be more physical than those computed through classical acoustic analogies in which the flow field is decomposed into a steady mean and fluctuating component.
aeroacoustics, jet noise
0022-1120
335-350
Sinayoko, Samuel
0e4346ca-1a26-481d-8241-f83730f6b0e4
Agarwal, A.
af807c47-9d52-454b-9892-e7cc1b736b20
Hu, Z.
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Sinayoko, Samuel
0e4346ca-1a26-481d-8241-f83730f6b0e4
Agarwal, A.
af807c47-9d52-454b-9892-e7cc1b736b20
Hu, Z.
dd985844-1e6b-44ba-9e1d-fa57c6c88d65

Sinayoko, Samuel, Agarwal, A. and Hu, Z. (2011) Flow decomposition and aerodynamic sound generation. Journal of Fluid Mechanics, 668, 335-350. (doi:10.1017/S0022112010004672).

Record type: Article

Abstract

An approximate decomposition of fluid-flow variables satisfying unbounded compressible Navier–Stokes equations into acoustically radiating and non-radiating components leads to well-defined source terms that can be identified as the physical sources of aerodynamic noise. We show that, by filtering the flow field by means of a linear convolution filter, it is possible to decompose the flow into non-radiating and radiating components. This is demonstrated on two different flows: one satisfying the linearised Euler equations and the other the Navier–Stokes equations. In the latter case, the corresponding sound sources are computed. They are found to be more physical than those computed through classical acoustic analogies in which the flow field is decomposed into a steady mean and fluctuating component.

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e-pub ahead of print date: 3 December 2010
Published date: 1 January 2011
Keywords: aeroacoustics, jet noise
Organisations: Aerodynamics & Flight Mechanics

Identifiers

Local EPrints ID: 184763
URI: http://eprints.soton.ac.uk/id/eprint/184763
ISSN: 0022-1120
PURE UUID: fef7de66-2e79-4486-9cfd-e0d832398223

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Date deposited: 06 May 2011 14:26
Last modified: 14 Mar 2024 03:10

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Contributors

Author: Samuel Sinayoko
Author: A. Agarwal
Author: Z. Hu

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