Far-field noise prediction of round and serrated jets with increasingly refined grids
conference contributionposted on 31.05.2016 by Matteo Angelino, Hao Xia, Miguel Moratilla-Vega, Gary Page
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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 work is financially supported by UK Engineering and Physical Sciences Research Council (EPSRC) under grant number EP/M01391X/1
- Aeronautical, Automotive, Chemical and Materials Engineering
- Aeronautical and Automotive Engineering