A three-dimensional hybrid LES-acoustic analogy method for predicting open-cavity noise
A three-dimensional hybrid LES-acoustic analogy method for predicting open-cavity noise
A three-dimensional (3D) hybrid LES-acoustic analogy method for computational
aeroacoustics (CAA) is presented for the prediction of open-cavity noise. The method uses
large-eddy simulation (LES) to compute the acoustic source while the Ffowcs Williams-
Hawkings (FW-H) acoustic analogy is employed for the prediction of the far-field sound. As a
comparison, a two-dimensional (2D) FW-H analogy is also included. The hybrid method has
been assessed in an open-cavity flow at a Mach number of 0.85 and a Reynolds number of
Re=1.36×106, where some experimental data are available for comparison. The study has
identified some important technical issues in the application of the FW-H acoustic analogy
to cavity noise prediction and CAA in general, including the proper selection of the
integration period and the modes of sound sources in the frequency domain. The different
nature of 2D and 3D wave propagation is also highlighted, which calls for a matching
acoustic solver for each problem. The developed hybrid method has shown promise to be a
feasible, accurate and computationally affordable approach for CAA.
55-82
Lai, H.
d29d0222-d1d4-4188-b3c9-fcc6f5b33e1e
Luo, K.H.
1c9be6c6-e956-4b12-af13-32ea855c69f3
July 2007
Lai, H.
d29d0222-d1d4-4188-b3c9-fcc6f5b33e1e
Luo, K.H.
1c9be6c6-e956-4b12-af13-32ea855c69f3
Lai, H. and Luo, K.H.
(2007)
A three-dimensional hybrid LES-acoustic analogy method for predicting open-cavity noise.
Flow Turbulence and Combustion, 79 (1), .
(doi:10.1007/s10494-006-9066-y).
Abstract
A three-dimensional (3D) hybrid LES-acoustic analogy method for computational
aeroacoustics (CAA) is presented for the prediction of open-cavity noise. The method uses
large-eddy simulation (LES) to compute the acoustic source while the Ffowcs Williams-
Hawkings (FW-H) acoustic analogy is employed for the prediction of the far-field sound. As a
comparison, a two-dimensional (2D) FW-H analogy is also included. The hybrid method has
been assessed in an open-cavity flow at a Mach number of 0.85 and a Reynolds number of
Re=1.36×106, where some experimental data are available for comparison. The study has
identified some important technical issues in the application of the FW-H acoustic analogy
to cavity noise prediction and CAA in general, including the proper selection of the
integration period and the modes of sound sources in the frequency domain. The different
nature of 2D and 3D wave propagation is also highlighted, which calls for a matching
acoustic solver for each problem. The developed hybrid method has shown promise to be a
feasible, accurate and computationally affordable approach for CAA.
This record has no associated files available for download.
More information
Published date: July 2007
Additional Information:
Funded by EPSRC: Large Eddy Simulation and Control of Aeroacoustics (GR/R85303/01)
Identifiers
Local EPrints ID: 48564
URI: http://eprints.soton.ac.uk/id/eprint/48564
ISSN: 1386-6184
PURE UUID: 8b60c78c-8d57-4997-b625-37a96124ae87
Catalogue record
Date deposited: 01 Oct 2007
Last modified: 15 Mar 2024 09:47
Export record
Altmetrics
Contributors
Author:
H. Lai
Author:
K.H. Luo
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics