Noise reduction by screens applied to tandem cylinders was studied numerically. The screen was modeled by adding source terms to the Navier–Stokes equations. To validate the screen model, a windbreak installed on the ground and a cylinder covered by a perforated shroud were simulated. Good agreement between numerical and experimental results demonstrated its capability in predicting flow changed by screens. Subsequently, the screen model was applied to the tandem cylinders. Effects of screen porosity and location were investigated. When the screen was placed before the front cylinder, the noise was decreased by reducing local flow speed. The dominant frequency and sound pressure level reduced when the porosity decreased from 0.79 to 0.49. When the screen was placed between the two cylinders, the noise was reduced by weakening the vortex shedding and its strike on the rear cylinder. The screen is an effective tool for suppressing the noise from tandem cylinders. The noise reduction by screen can be reproduced by the present screen model.
Numerical Modeling Screen for Flow and Noise Control Around Tandem Cylinders
AIAA Journal ; 58 , 6 ; 2504-2516
01.06.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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