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Integrating CFD source predictions with time-domain CAA for intake fan noise prediction

Integrating CFD source predictions with time-domain CAA for intake fan noise prediction
Integrating CFD source predictions with time-domain CAA for intake fan noise prediction
A method is proposed for integrating a source prediction obtained from a Computational Fluid Dynamics (CFD) model for the fan stage of a turbofan engine with a Computational Aero-Acoustics (CAA) propagation code to predict tonal noise radiation in the far field. The Reynolds-Averaged Navier-Stokes equations are used to model the generation of the tones. Their propagation through the intake is simulated by applying the Discontinuous Galerkin Method to solve the linearized Euler equations in the time domain. The CFD and the CAA solutions are matched in a region where both solutions overlap and where non-linear effects, important close to the fan, can be considered to be less significant. An equivalent modal source on a notional source plane behind the fan is used to duplicate the sound field in this matching region and is then to drive a fully three-dimensional CAA radiation model for a near-field acoustic solution. The far-field sound pressure is obtained by applying the Ffowcs Williams-Hawkings formulation on a porous surface within the CAA domain. The accuracy and efficiency of this approach are investigated and results obtained are compared to measured data from a fan rig.
Aeroacoustics, duct acoustics, discontinuous galerkin methods, Turbofan engine noise, computational aeroacoustics (CAA), fan noise, Prediction, Aircraft noise
American Institute of Aeronautics and Astronautics
Rarata, Zbigniew
93cc0733-a371-48ff-916c-720f149e2f2d
Gabard, Gwenael
bfd82aee-20f2-4e2c-ad92-087dc8ff6ce7
Sugimoto, Rie
cb8c880d-0be0-4efe-9990-c79faa8804f0
Coupland, John
f0429ea4-fe7f-42df-b6fd-fd2e1446412f
Astley, Richard Jeremy
cb7fed9f-a96a-4b58-8939-6db1010f9893
Namgoong, Howoong
ad304c04-8cb4-4976-a765-ad7f47ad8b96
schwaller, Peter J G
84943fab-873a-4141-9089-4d6ab2aea2e4
Rarata, Zbigniew
93cc0733-a371-48ff-916c-720f149e2f2d
Gabard, Gwenael
bfd82aee-20f2-4e2c-ad92-087dc8ff6ce7
Sugimoto, Rie
cb8c880d-0be0-4efe-9990-c79faa8804f0
Coupland, John
f0429ea4-fe7f-42df-b6fd-fd2e1446412f
Astley, Richard Jeremy
cb7fed9f-a96a-4b58-8939-6db1010f9893
Namgoong, Howoong
ad304c04-8cb4-4976-a765-ad7f47ad8b96
schwaller, Peter J G
84943fab-873a-4141-9089-4d6ab2aea2e4

Rarata, Zbigniew, Gabard, Gwenael, Sugimoto, Rie, Coupland, John, Astley, Richard Jeremy, Namgoong, Howoong and schwaller, Peter J G (2014) Integrating CFD source predictions with time-domain CAA for intake fan noise prediction. In 20th AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics. 15 pp . (doi:10.2514/6.2014-2456).

Record type: Conference or Workshop Item (Paper)

Abstract

A method is proposed for integrating a source prediction obtained from a Computational Fluid Dynamics (CFD) model for the fan stage of a turbofan engine with a Computational Aero-Acoustics (CAA) propagation code to predict tonal noise radiation in the far field. The Reynolds-Averaged Navier-Stokes equations are used to model the generation of the tones. Their propagation through the intake is simulated by applying the Discontinuous Galerkin Method to solve the linearized Euler equations in the time domain. The CFD and the CAA solutions are matched in a region where both solutions overlap and where non-linear effects, important close to the fan, can be considered to be less significant. An equivalent modal source on a notional source plane behind the fan is used to duplicate the sound field in this matching region and is then to drive a fully three-dimensional CAA radiation model for a near-field acoustic solution. The far-field sound pressure is obtained by applying the Ffowcs Williams-Hawkings formulation on a porous surface within the CAA domain. The accuracy and efficiency of this approach are investigated and results obtained are compared to measured data from a fan rig.

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More information

Accepted/In Press date: 2014
Published date: June 2014
Venue - Dates: 20th AIAA/CEAS Aeroacoustics Conference, United States, 2014-06-16 - 2014-06-20
Keywords: Aeroacoustics, duct acoustics, discontinuous galerkin methods, Turbofan engine noise, computational aeroacoustics (CAA), fan noise, Prediction, Aircraft noise

Identifiers

Local EPrints ID: 426774
URI: http://eprints.soton.ac.uk/id/eprint/426774
PURE UUID: dafec47c-1e60-404e-8a28-ca6d71e76830

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Date deposited: 12 Dec 2018 17:30
Last modified: 12 Dec 2018 17:30

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Contributors

Author: Zbigniew Rarata
Author: Gwenael Gabard
Author: Rie Sugimoto
Author: John Coupland
Author: Howoong Namgoong
Author: Peter J G schwaller

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