A computational investigation of jet-pylon-wing-flap interaction based on a model installed jet geometry for a co-axial jet at bypass ratio (BPR) 5 is presented. For numerical modelling of jet installation effects, Monotonically Integrated Large Eddy Simulations (MILES) are conducted with the CABARET method. For accurate sound predictions at downstream jet radiation angles, a penetrable Ffowcs Williams-Haw kings (FWH) technique with multiple closing disks is applied. The axial and vertical distributions of the mean axial velocity and turbulent kinetic energy obtained from the CABARET calculations are compared with the reference RANS/ILES solution of Lyubimov (2013) and with the experiment data for the axisymmetric jet case and for the nozzle-with-pylon case. The far-field acoustic spectra predictions are obtained for the jet flow with penetrable (for jet-aiframe configuration) and impenetrable (for wing-flap alone) FWH formulations. The sound spectra computed is compared with the acoustic results for jet-pylon-wing-flap configuration of similar geometrical parameters at BPR 10 from the literature with the scaling based on the mixed out jet core parameters in accordance with Lush (1971) method.
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