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Effects of fluid-structure interaction on trailing-edge noise

Young J. Moon
The Journal of Mechanical Science and Technology, vol. 22, no. 7, pp.1426-1435, 2008

Abstract : This study numerically investigates the effects of fluid-structure interaction (FSI) on the trailing-edge noise, particularly for the cases of wake instability and Karman vortex shedding. The trailing edge is modeled as a flat plate with an elastic cantilever end and its flow-induced vibration is solved by an eigenmode analysis with the Galerkin method. The flow and sound coupled in the FSI analysis are computed on the moving grid by a direct numerical simulation (DNS) procedure. The computed result of wake instability shows that when the first-eigenmode natural frequency ¥øn of the cantilever is close to be resonant with the wake characteristic frequency ¥øc, the sound pressure level (SPL) is significantly reduced by 20 dB at ¥øn/¥øc=0.95, or increased by 15 dB at ¥øn/¥øc=1.05, for all angles. For the Karman vortex shedding, a similar frequency modulation occurs via FSI, if ¥øn is close to ¥øc. The flow and acoustic details are somewhat different for this case but a considerable noise reduction was also possible for angles from -120¨¬ to +120¨¬.

Keyword : Trailing-edge noise reduction; Fluid-structure interaction; Frequency modulation; Wake instability; Karman vortex shedding

 
 
 
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