What is it about?

When fluid flows around bluff bodies, it creates vortex shedding, which leads to aerodynamic noise. This study focuses on reducing that noise using a control technique called suction-blowing excitation. In suction excitation, fluid is pulled into the body, while in blowing excitation, fluid is pushed out. Different arrangements of suction and blowing are tested to find the best set-up. Key parameters of excitation are analyzed to determine the optimal values for reducing noise intensity. By adjusting these parameters, the results show that sound directivity can be controlled and it has potential to direct sound waves to propagate in desired directions. Additionally, increasing the strength of the excitation can significantly reduce the drag force acting on the body improving aerodynamic performance.

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Why is it important?

Flow-induced sound is often unwanted, causing discomfort and even potential health problems. Additionally, there is a growing demand for quieter and more energy-efficient systems. As a result, understanding how such noise is generated and exploring effective ways to reduce it has become essential. This study presents a potential method to control aeroacoustic noise. The proposed technique can reduce both the intensity of the sound and the drag force acting on the object. Furthermore, it allows for controlling the direction of sound wave propagation, making it a versatile solution that can be applied to various systems.

Perspectives

I believe this article will be particularly engaging for readers interested in acoustics. The control method discussed here offers a promising approach to managing both the direction and intensity of flow-induced sound. I see significant potential for this method to be further explored and applied to streamline bodies, opening up exciting possibilities for future research and practical applications.

Shashi Kumar
Indian Institute of Technology Bhubaneswar

Read the Original

This page is a summary of: Control of aeolian tone from a square cylinder using periodic suction-blowing excitation at low Reynolds number using direct numerical simulation approach, Physics of Fluids, November 2024, American Institute of Physics,
DOI: 10.1063/5.0234414.
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