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Communication Dans Un Congrès Année : 2020

An analytical approach based on tailored Green's functions for flow noise prediction at low Mach number

Résumé

The presence of boundary surfaces in a turbulent flow can result in the enhancement of the radiated acoustic field especially for eddies close to any geometrical singularity. At low Mach number, it is well known that the contribution of the diffracted field is dominant. In the present study, we focus on Lighthill?s wave equation solved using a tailored Green?s function and a semi-empirical turbulence model in order to investigate the direct acoustic field produced by a turbulent boundary layer over a flat plate. We consider both the turbulent boundary layer noise and edge noise, and power law results deduced from classical dimensional analysis are recovered. The specular acoustic field, produced by eddies far from any edge increases in proportion to the fourth power of the Mach number and the diffracted field directly in proportion to the Mach number. Finally, we chose a NACA 0012 airfoil in order to validate the noise spectrum prediction for different configurations for which trailing edge noise is the dominant contribution.
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Dates et versions

hal-03229454 , version 1 (24-06-2021)

Identifiants

Citer

Nicolas Trafny, Gilles Serre, Benjamin Cotte, Jean-François Mercier. An analytical approach based on tailored Green's functions for flow noise prediction at low Mach number. Forum Acusticum, Dec 2020, Lyon, France. pp.749-750, ⟨10.48465/fa.2020.0912⟩. ⟨hal-03229454⟩
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