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Empiricism-free noise calculation from LES solution based on Goldstein generalized acoustic analogy: Volume noise sources and meanflow effects
V.A. Semiletov, S.A. Karabasov, A.P. Markesteijn,
Published in American Institute of Aeronautics and Astronautics Inc, AIAA
2016
Abstract
The hybrid CAA method with propagation equations corresponded to the Goldstein generalized acoustic analogy and noise sources extracted from time-resolved LES solution is considered. In the current implementation, which includes sound propagation meanflow effects, noise source information was extracted directly from LES without any assumptions of statistic properties such as fourth-order velocity correlations, which makes this tool applicable for investigation of jet mixing noise without using any intermediate assumptions. Far-field noise and noise source statistics have been calculated for two subsonic single-stream jets. One jet is isothermal and the other is heated corresponding to temperature ratio (Tj/T0=2.5); they have the same acoustic Mach number (Uj/co=0.875) and correspond to jet conditions of model-scale tests recently conducted at the QinetiQ Noise Test Facility. For unsteady flow calculation, Monotonically Integrated Large Eddy Simulation (MILES) is used based on the high-resolution CABARET scheme. Flow field solutions and far-field noise predictions are compared with the experimental data available as well as with the results of the Ffowcs Williams - Hawkings solution based on the same set of LES data. © 2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
About the journal
JournalData powered by Typeset21st AIAA/CEAS Aeroacoustics Conference
PublisherData powered by TypesetAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISSN0001-1452
Impact Factor1.868
Citation Styleunsrt
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