ANGELINO, M. ...et al., 2016. Far-field noise prediction of round and serrated jets with increasingly refined grids. Presented at the 22nd AIAA/CEAS Aeroacoustics Conference, Lyon, France 30th May- 1st June.
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.
This paper was presented at the 22nd AIAA/CEAS Aeroacoustics Conference and the definitive published version is available at http://dx.doi.org/10.2514/6.2016-3047
This work is financially supported by UK Engineering and Physical Sciences Research Council (EPSRC) under grant number EP/M01391X/1