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- W2107766118 abstract "Large-eddy simulations (LES) of a circular supersonic fully expanded jet and an underexpanded jet are performed. Both jets operate at a design Mach number 1.95, and the corresponding fully expanded Mach number for the underexpanded jet is 2.20. Since the simulations do not include the nozzle geometry explicitly, the efiects of the in∞ow conditions (such as the forcing modes and shear layer thickness) on the near fleld statistics and far fleld noise are investigated. The near fleld data are collected from the LES and then the far fleld noise is computed by the Ffowcs Williams-Hawkings (FWH) surface integral method. The results show that removing the lower forcing modes increases the centerline velocity decay rate, the peak turbulence intensities, and the overall sound pressure level. However, reducing the in∞ow shear layer thickness has the opposite efiect and achieves a better agreement with the experiments in both near fleld statistics and farfleld noise. Similar trends hold for the underexpanded jet in near fleld statistics; however, the number of shock cells is underpredicted and is insensitive to the in∞ow conditions. This may be due to contamination by spurious numerical ∞uctuations caused by the shocks. Further simulations including shock capturing schemes are needed." @default.
- W2107766118 created "2016-06-24" @default.
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- W2107766118 date "2008-05-05" @default.
- W2107766118 modified "2023-09-24" @default.
- W2107766118 title "Numerical Simulation of Supersonic Jet Flows and their Noise" @default.
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- W2107766118 doi "https://doi.org/10.2514/6.2008-2970" @default.
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