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Aeroacoustic Computation of Cavity Flow in Self-Sustained Oscillations  

Koh, Sung-Ryong (Department of Mechanical Engineering Korea University)
Yong Cho (Department of Mechanical Engineering Korea University)
Young J. Moon (Department of Mechanical Engineering korea University)
Publication Information
Journal of Mechanical Science and Technology / v.17, no.4, 2003 , pp. 590-598 More about this Journal
Abstract
A computational aero-acoustic (CAA) method is used to predict the tonal noise generated from a cavity of automobile door seals or gaps at low flow Mach numbers (A$\_$$\infty$/=0.077 and 0.147) In the present method, the acoustically perturbed Euler equations are solved with the acoustic source term obtained from the unsteady incompressible Navier-Stokes calculations of the cavity flow in self-sustained oscillations. The aerodynamic and acoustic fields are computed for the Reynolds numbers based on the displacement thickness, Re$\_$$\delta$*/=850 and 1620 and their fundamental mode characteristics are investigated. The present method is also verified with the experimentally measured sound pressure level (SPL) spectra.
Keywords
Cavity Tone; Feedback mechanism; CFD; Computational Aero-Acoustics (CAA);
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