Effect of rounded corners on the flow and noise from a cube

Wang, Yanan, Thompson, David and Hu, Zhiwei (2018) Effect of rounded corners on the flow and noise from a cube. In 2018 AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics.. (doi:10.2514/6.2018-2960).

Record type: Conference or Workshop Item (Paper)

Abstract

In this work, the flow characteristics and the emitted noise at different Reynolds numbers for a cube in free space are investigated numerically for a series of rounded corners. In the first step, the Delayed Detached Eddy Simulation (DDES) model is employed in the Computational Fluid Dynamics (CFD) technique to examine the flow features. Subsequently, based on the fluctuating pressure on the solid surfaces obtained from the CFD simulation, the noise in the far field is predicted by using the Ffowcs Williams and Hawkings (FW-H) acoustic analogy. The results show that, as the cube is increasingly rounded, the location of the flow separation moves from the leading edges further downstream. The variations in the flow topology due to the corner radius and the Reynolds number influence the sound radiated to the far field. It turns out that by increasing the radius of the rounded corners, the noise from a cube is reduced, which suggests it is a practical way to reduce the noise from cubes.

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