A diagnostic tool for jet noise using a line-source approach and implicit large-Eddy simulation data

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Title: A diagnostic tool for jet noise using a line-source approach and implicit large-Eddy simulation data
Author(s): Laizet, S
Ioannou, V
Margnat, F
Item Type: Journal Article
Abstract: In this work, we propose a cost-effective approach allowing one to evaluate the acoustic field generated by a turbulent jet. A turbulence-resolving simulation of an incompressible turbulent round jet is performed for a Reynolds number equal to thanks to the massively parallel high-order flow solver Incompact3d. Then a formulation of Lighthill's solution is derived, using an azimuthal Fourier series expansion and a compactness assumption in the radial direction. The formulation then reduces to a line source theory, which is cost-effective to implement and evaluate. The accuracy of the radial compactness assumption, however, depends on the Strouhal number, the Mach number, the observation elevation angle, and the radial extent of the source. Preliminary results are showing that the proposed method approaches the experimental overall sound pressure level by less than 4 dB for aft emission angles below 50°.
Publication Date: 1-Oct-2018
Date of Acceptance: 4-Apr-2018
URI: http://hdl.handle.net/10044/1/58900
DOI: https://dx.doi.org/10.1016/j.crme.2018.07.007
ISSN: 1631-0721
Publisher: Elsevier Masson
Start Page: 903
End Page: 918
Journal / Book Title: Comptes Rendus Mécanique
Volume: 346
Issue: 10
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: ep/m022676/1
Copyright Statement: © 2018 Académie des sciences. Published by Elsevier Masson SAS. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Science & Technology
Technology
Mechanics
Turbulence
Large-eddy simulations
Acoustic predictions
TURBULENT JETS
AEROACOUSTIC INTEGRALS
INCOMPRESSIBLE FLOWS
SUBSONIC JETS
WAVE-PACKETS
SHEAR-FLOW
WAVEPACKETS
RADIATION
SCHEMES
LAYER
0913 Mechanical Engineering
Mechanical Engineering & Transports
Publication Status: Published
Embargo Date: 2019-07-24
Online Publication Date: 2018-07-24
Appears in Collections:Faculty of Engineering
Aeronautics



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