Experimentally informed, linear mean-field modelling of circular cylinder aeroacoustics

IF 2.2 3区工程技术 Q2 MECHANICS

Theoretical and Computational Fluid Dynamics Pub Date : 2025-02-19 DOI:10.1007/s00162-025-00739-z

Robin Prinja, Peter Jordan, Florent Margnat

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Abstract

A noise modelling approach is proposed for bluff body wakes such as flow over a cylinder, where the primary noise source comprises large-scale coherent structures such as the vortex shedding flow feature. This phenomenon leads to Aeolian tones in the far-field, and is inherent in wake flows across a range of Reynolds numbers (Re), from low-Re to high-Re turbulent flows. The approach employs linear global stability analysis on the time-averaged mean flow, with amplitude calibration through two-point statistics, and far-field noise calculations from the global mode fluctuations by Curle’s analogy. The overall approach is tested for flow over a cylinder at Reynolds numbers Re = 150 and 13,300. For Re = 150 flow, noise directivity calculations from the present approach agree with direct far-field computations. For Re = 13,300 flow, the mean flow is obtained by particle image velocimetry (PIV). The linear global mode for spanwise-homogeneous-type fluctuations is obtained at the main, lift fluctuation frequency. Calibration of this global mode involves time-resolved PIV data in the streamwise-spanwise plane, which is Fourier transformed in frequency-spanwise wavenumber space. The noise calculations for this global mode are then found to be less than 1 dB off from the microphone measurements.

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实验信息，圆柱气动声学线性平均场模型

提出了一种钝体尾迹（如圆柱流动）的噪声建模方法，其中主要噪声源包括大尺度相干结构（如漩涡脱落流动特征）。这种现象导致远场的风成调，并且在从低Re到高Re的雷诺数范围内的尾流中是固有的。该方法对时间平均平均流量进行线性全局稳定性分析，通过两点统计进行幅度校准，并通过Curle类比从全球模态波动中计算远场噪声。在雷诺数Re = 150和13,300的情况下，对整个方法进行了测试。对于Re = 150的流动，本文方法的噪声指向性计算与直接远场计算一致。对于Re = 13300的流量，采用粒子图像测速法（PIV）获得平均流量。在主要升力波动频率处，得到了展向均匀型波动的线性全局模态。该全局模式的校准涉及到流向-跨向平面上的时间分辨PIV数据，该数据在频率-跨向波数空间中进行傅里叶变换。然后发现该全局模式的噪声计算与麦克风测量值相差小于1 dB。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Theoretical and Computational Fluid Dynamics 物理-力学

CiteScore

5.80

自引率

2.90%

发文量

审稿时长

>12 weeks

期刊介绍： Theoretical and Computational Fluid Dynamics provides a forum for the cross fertilization of ideas, tools and techniques across all disciplines in which fluid flow plays a role. The focus is on aspects of fluid dynamics where theory and computation are used to provide insights and data upon which solid physical understanding is revealed. We seek research papers, invited review articles, brief communications, letters and comments addressing flow phenomena of relevance to aeronautical, geophysical, environmental, material, mechanical and life sciences. Papers of a purely algorithmic, experimental or engineering application nature, and papers without significant new physical insights, are outside the scope of this journal. For computational work, authors are responsible for ensuring that any artifacts of discretization and/or implementation are sufficiently controlled such that the numerical results unambiguously support the conclusions drawn. Where appropriate, and to the extent possible, such papers should either include or reference supporting documentation in the form of verification and validation studies.