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 in order to evaluate the acous- tic eld generated by a turbulent jet. A turbulence-resolving simulation of an incompressible turbulent round jet is performed for a Reynolds number equal to 460 ; 000 thanks to the massively parallel high-order ow 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 im- plement 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 4dB for aft emission angles below 50 ◦ .
Publication Date: 1-Jan-2018
Date of Acceptance: 4-Apr-2018
URI: http://hdl.handle.net/10044/1/58900
ISSN: 1631-0721
Publisher: Elsevier Masson
Journal / Book Title: Comptes Rendus Mécanique
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: ep/m022676/1
Keywords: 0913 Mechanical Engineering
Mechanical Engineering & Transports
Publication Status: Accepted
Appears in Collections:Faculty of Engineering
Aeronautics



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