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Article Dans Une Revue Comptes Rendus Mécanique Année : 2018

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

Résumé

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 460,000 thanks to the massively parallel high-order flow solver In compact 3d. Then a formulation of Lighthill’s solutionis derived, using an azimuthal Fourier series expansion and a compactness assumption in the radial direction. The formulation then reduces to aline source theory, which is cost-effective to implement and evaluate. The accuracy of the radial compact ness assumption, how ever, depends on the Strouhal number, the Machnumber, the observation elevation angle,and the radial extent of the source. Preliminary results are showing that the proposed method approaches the experimental over all sound pressure level by less than 4 dB for aft emission angles below 50◦.

Dates et versions

hal-02318789 , version 1 (17-10-2019)

Identifiants

Citer

Florent Margnat, Vasilis Ioannou, Sylvain Laizet. A diagnostic tool for jet noise using a line-source approach and implicit large-eddy simulation data. Comptes Rendus Mécanique, 2018, 346 (10), pp.903-918. ⟨10.1016/j.crme.2018.07.007⟩. ⟨hal-02318789⟩
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