Passive control of flow and noise around a circular cylinder covered with porous material

Abstract eng:
This paper presents a numerical study to investigate flow and noise around a cylinder surface covered by porous material. The large eddy simulation and acoustic analogy are employed to predict the cylinder flow and noise, respectively. Three—dimensional instantaneous flowfield inside the porous zone is simulated by using a volume—averaged method. The flow information on different permeable data surfaces is successively employed to predict the aerodynamic noise. The result obtained from unsteady flow simulation reveals that the porous material postpones the alternating vortex shedding from the cylinder, not only reducing the pressure drag but also suppressing the pressure fluctuation on the cylinder surface. The aeroacoustics prediction results confirm that the porous material significantly reduces the aerodynamic noise of the cylinder flow.

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