| 用大涡模拟方法研究湍流边界层流动噪声 |
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| 引用本文： | 潘雨村,张怀新.用大涡模拟方法研究湍流边界层流动噪声[J].船舶力学,2009,13(6). |
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| 作者姓名： | 潘雨村 张怀新 |
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| 作者单位： | 1. 上海交通大学海洋工程国家重点实验室,上海,200030;海军工程大学船舶与海洋工程系,武汉,430033
2. 上海交通大学海洋工程国家重点实验室,上海,200030 |
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| 基金项目： | 国家自然科学基金，the Research Fund of State Key Laboratory of Ocean Engineering |
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| 摘 要： | 利用大涡模拟方法,对刚性光滑平板上充分发展的低马赫数湍流边界层流动进行了数值模拟.在此基础上将时一空变化的湍流流场信息作为近场声源,运用Lishthill的声学类比理论计算了边界层辐射噪声.文中讨论了偶极子、四极子对噪声的贡献,通过对比它们的功率谱密度,认为壁面剪切应力(偶极子)是湍流边界层辐射噪声的主要来源.
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| 关 键 词： | 湍流边界层 水动力噪声 大涡模拟 Lighthill声学类比理论 |
LES Method for Investigation of Noise Generated by Turbulent Boundary Layer |
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| PAN Yu-cun,ZHA NG Huai-xin.LES Method for Investigation of Noise Generated by Turbulent Boundary Layer[J].Journal of Ship Mechanics,2009,13(6). |
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| Authors: | PAN Yu-cun ZHA NG Huai-xin |
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| Abstract: | Large Eddy Simulation (LES) was used to investigate space-time field of the low Mach number, fully developed turbulent boundary layer on a smooth, rigid fiat plate. The flowfield simu-lated by LES was taken as near-field sound sources and radiated sound from turbulent boundary layer (TBL) was studied using Lighthill's acoustics analogy. The radiated sound of dipole type, of quadrupole type, and of the sum of the two above were discussed. Comparing their power spectral densities, it is concluded that in low Mach number, the wall shear stress (dipole type of source) is the predominant factor responsible for sound radiation from TBL. |
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| Keywords: | turbulent boundary layer hydroacoustics large eddy simulation Lighthill's acoustic analogy |
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