Numerical analysis of the correlation between fluid dynamic modes and hydrodynamic noise in flows around a three-dimensional circular cylinder

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-03-21 DOI:10.1007/s42241-024-0002-1

Jia-jia Qin, Ming-xin Zou, Yuan Zhuang, De-cheng Wan

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引用次数: 0

Abstract

The flow around a circular cylinder for Re = 1000 is characterized by flow separation and Karman vortex street. The typical flow features can be captured to study the correlation between fluid fields and sound fields. In this paper, the three-dimensional circular cylinder is taken as the research object, and the probes of surface fluctuating pressure and far field sound pressure are arranged every 10°. The directional diagram and the coherence of fluctuating pressure and sound pressure are analyzed. The relationship between the flow mode and hydrodynamic noise is studied by using dynamic mode decomposition (DMD). The characteristics of the dipole and quadrupole sound source term of a long span cylinder are studied. The results show that at the angles between 30°–120° and 190°–350°, the fluctuating pressure contributes more to the generation of dipole sounds. The quadrupole sound source shows three-dimensional effects, which is more obvious in a cylinder with large spanwise length.

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围绕三维圆柱体的流动中流体动力学模式与流体动力噪声之间相关性的数值分析

Re = 1000 时，环绕圆柱体的流动具有流动分离和卡曼涡街的特征。捕捉典型的流动特征可以研究流场与声场之间的相关性。本文以三维圆柱体为研究对象，每隔 10°布置一个表面波动压力和远场声压探头。分析了波动压力和声压的方向图和相干性。利用动模分解（DMD）技术研究了流模与水动力噪声之间的关系。研究了大跨度圆柱体的偶极和四极声源项的特性。结果表明，在 30°-120°和 190°-350°之间的角度，压力波动对偶极声源的产生有更大的影响。四极声源显示出三维效应，这在跨度较大的圆柱体中更为明显。

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来源期刊

Journal of Hydrodynamics MECHANICS-

自引率

12.00%

发文量

2374

审稿时长

4.6 months

期刊介绍： Journal of Hydrodynamics is devoted to the publication of original theoretical, computational and experimental contributions to the all aspects of hydrodynamics. It covers advances in the naval architecture and ocean engineering, marine and ocean engineering, environmental engineering, water conservancy and hydropower engineering, energy exploration, chemical engineering, biological and biomedical engineering etc.