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- W2328655276 abstract "Different jet simulations with realistic nozzle geometries for dual-stream jets are performed using the fully unstructured Large Eddy Simulation solver AVBP developed at Cerfacs. First, an isothermal low-Mach coaxial jet which has been experimentally investigated at the P Institute of Poitiers is simulated. The second investigated configuration is a tenth reduction of a generic model of a high-bypass ratio engine operated at take-off conditions experimentally investigated in the EXEJET project framework at the CEPRA19 Onera anechoic wind-tunnel. The third one is a 12-lobes internal mixer investigated at NASA Glenn Research Center. A similar meshing and numerical strategy has been followed for the three simulations in order to validate the methodology on different challenging jet noise configurations of increasing complexity. The aerodynamic results are in good agreement with the experimental measurements available for the three configurations. The sensitivity to the nozzle exit conditions and especially to the boundary layers resolution at the exit of the nozzle are demonstrated by the different meshes used for each configuration. These results validate the present numerical approach to capture the proper jet developments in all three configurations. For the three configurations, the acoustic results computed using the Ffowcs Williams and Hawking’s analogy are also in good agreement with the experimental measurements, particularly at 30 degrees in the downstream direction. The low Mach number of the coaxial jet configuration makes it more challenging as the noise level decreases. For all the simulations, proper control of the laminar to turbulent transition, to avoid large vortex pairing in the external mixing layers, seems to be the key for accurate acoustic predictions." @default.
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- W2328655276 date "2014-06-13" @default.
- W2328655276 modified "2023-09-23" @default.
- W2328655276 title "Dual-stream jet noise simulations with realistic nozzle geometries using a fully unstructured LES solver" @default.
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- W2328655276 doi "https://doi.org/10.2514/6.2014-2756" @default.
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