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均匀各向同性湍流的频率波数能量谱
Frequency-wavenumber energy spectra in isotropic
turbulence
查看参考文献9篇
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文摘
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对均匀各向同性湍流的频率波数能量谱进行了初步研究，得出均匀各向同性湍流中能量随时间、空间尺度分布的解析表达式，并运用直接数值模拟的方法对理论预测进行验证．数值结果很好地支持了理论预测：横扫速度是决定频率波数能量谱的特征量． |
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其他语种文摘
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The energy spectra with respect to wavenumbers in isotropic homogeneous turbulence have been studied thoroughly. However, less attention has been paid to the frequeiicy-wavenumber energy spectra, which are important to the temporal statistics in turbulence and aeroacoustics. In this paper, the frequency-wavenumber energy spectra are at first formulated based on the Kolmogorov's classic theory and the sweeping hypothesis. A direct numerical simulation on isotropic turbulence is carried out to verify our theoretical predictions. It is indicated from our theoretical arguments and numerical simulations that the sweeping velocity dominates the frequency-wavenumber energy spectra. The frequency energy spectra at different wavenumbers are shown to be collapsed under the normalization of the sweeping velocity. |
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来源
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力学学报
,2003,35(3):317-320 【核心库】
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关键词
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均匀各向同性湍流
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时间关联函数
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频率波数能量谱
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横扫假设
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直接数值模拟
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地址
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1.
北京航空航天大学飞行力学与控制教研室, 北京, 100083
2.
中国科学院力学研究所, 非线性力学国家重点实验室, 北京, 100080
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0459-1879 |
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学科
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力学 |
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文献收藏号
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CSCD:1317799
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9
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