Far-field noise prediction of round and serrated jets with increasingly refined grids Matteo Angelino Hao Xia Miguel Moratilla-Vega Gary Page 2134/21418 https://repository.lboro.ac.uk/articles/conference_contribution/Far-field_noise_prediction_of_round_and_serrated_jets_with_increasingly_refined_grids/9220796 Turbulent jet large-eddy simulations (LES) are performed at Mach 0.9 and Reynolds number of 106. For subgrid scale stress modeling the σ-model is used. Solutions are obtained for a baseline axisymmetric (round) nozzle and a serrated (or chevron) nozzle with high bending and penetration, on grids ranging from 5 to 80 million grid points in order to assess the correlation between coarser and finer grid solutions. Computed mean and second-order fluctuating quantities of the turbulent near field compare favorably with measurements. The radiated far-field sound is predicted using the Ffowcs Williams and Hawkings (FW-H) surface integral method. Remarkable agreement of the predicted farfield sound directivity and spectra with measurements is obtained. A preliminary discussion is presented on the correlation and possible combination of multiple spectra from different grids. 2016-05-31 13:32:02 untagged Engineering not elsewhere classified