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

Florent Margnat; Vasilis Ioannou; Sylvain Laizet

doi:10.1016/j.crme.2018.07.007

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

Florent Margnat ¹ ; Vasilis Ioannou ²; Sylvain Laizet ²

¹ Institut Pprime, CNRS, Université de Poitiers, ISAE–ENSMA, 86962 Futuroscope Chasseneuil, France
² Department of Aeronautics, Imperial College London, London, SW7 2AZ, UK

Comptes Rendus. Mécanique, Volume 346 (2018) no. 10, pp. 903-918.

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 $460, 000$ 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°.

Received: 2017-09-06
Accepted: 2018-02-01
Published online: 2018-07-24

DOI: 10.1016/j.crme.2018.07.007

Keywords: Turbulence, Large-eddy simulations, Acoustic predictions

Author's affiliations:

Florent Margnat ¹; Vasilis Ioannou ²; Sylvain Laizet ²

¹ Institut Pprime, CNRS, Université de Poitiers, ISAE–ENSMA, 86962 Futuroscope Chasseneuil, France
² Department of Aeronautics, Imperial College London, London, SW7 2AZ, UK

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     author = {Florent Margnat and Vasilis Ioannou and Sylvain Laizet},
     title = {A diagnostic tool for jet noise using a line-source approach and implicit large-eddy simulation data},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {903--918},
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     doi = {10.1016/j.crme.2018.07.007},
     language = {en},
}

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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, Volume 346 (2018) no. 10, pp. 903-918. doi : 10.1016/j.crme.2018.07.007. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2018.07.007/

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