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Numerical Modal Analysis of the Correlation Between Spanwise Vortex Shedding and Far-field Aeolian Noise for Square and Circular Wall-mounted Cylinders

Publish Year: 1404
Type: Journal paper
Language: English
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JR_JAFM-18-2_011

Index date: 11 December 2024

Numerical Modal Analysis of the Correlation Between Spanwise Vortex Shedding and Far-field Aeolian Noise for Square and Circular Wall-mounted Cylinders abstract

For square and circular finite wall-mounted cylinders (FWMCs) with an aspect ratio exceeding 10, the vortex shedding near the tip area leads to the generation of multiple tonal noises. The quantitative analysis of the spanwise distributions of the vortex modal energy with different frequencies was quite limited. This study employs dynamic mode decomposition to decompose the wake of FWMC into distinct frequencies to evaluate the modal energy distribution of pressure fluctuations at each frequency along the spanwise direction. Large eddy simulation combined with the Ffowcs Williams–Hawkings (FW–H) acoustics analogy is applied to a square and a circular FWMC with aspect ratio of 13.6 at a Reynolds number of 2.3 × 104. Two indicators to describe the spanwise energy contribution are proposed. The results reveal that, for square FWMC, the primary modal energy corresponding to Strouhal number ( St ) equal to 0.14 is concentrated below 30% of the cylinder height  owing to the 3D effect. A transition mode of  St ≈ 0.12 is identified in the midspan (0.3 L–0.7L ) without significant contribution to far-field noise spectrum. For circular FWMC, the modal energy is distributed over several frequencies, vortices cells corresponding to the main noise band (0.2

Numerical Modal Analysis of the Correlation Between Spanwise Vortex Shedding and Far-field Aeolian Noise for Square and Circular Wall-mounted Cylinders Keywords:

Numerical Modal Analysis of the Correlation Between Spanwise Vortex Shedding and Far-field Aeolian Noise for Square and Circular Wall-mounted Cylinders authors

R. P. Jiang

Key Laboratory of Aero-Acoustics of Ministry of Industry and Information Technology, Beihang University, Beijing ۱۰۰۱۹۱, China

P. Q. Liu

Key Laboratory of Aero-Acoustics of Ministry of Industry and Information Technology, Beihang University, Beijing ۱۰۰۱۹۱, China

J. Zhang

Sino-French Engineer School, Beihang University, Beijing ۱۰۰۱۹۱, China

H. Guo

Key Laboratory of Aero-Acoustics of Ministry of Industry and Information Technology, Beihang University, Beijing ۱۰۰۱۹۱, China

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