High Fidelity Simulation of Turbulent Jet and Identification of Acoustic Sources

Dong-Hyuk Shin, Vlad Aparece-Scutariu, Edward Richardson

Research output: Contribution to journalArticle

Abstract / Description of output

A turbulent round jet at the Reynolds number of 7,290 is simulated by direct numerical simulation to study jet noise source and its propagation. A large domain of 60 diameters in the axial direction, 30 diameters in the radial direction, and full 360 degrees is chosen to minimize the effect of boundary conditions. The spatial statistics of the simulated flow and the peak ampli-tude of acoustic radiation at 45-degree angle agree well with existing literature, confirming the quality of the data. Motivated by Ffowcs-Williams and Hawkings equation, acoustic source terms for the far-field sound propagation were identified both in the time and the frequency domains. The spectra at three respective locations of the potential core, the shear layer, and the ambient in-dicate that the fluctuation magnitudes are highest in the shear layer, followed by the potential core and the ambient. The turbulent characteristics are isotropic in the potential core and the shear layer, and the ambient exhibits an intermittent behavior.
Original languageEnglish
Article number1
Pages (from-to)1-9
Number of pages9
JournalCivil Aircraft Design and Research
Volume3
DOIs
Publication statusPublished - 30 Sept 2017

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