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Alternative TitleScale similarity of coherent structures and scale-similar sub-grid model
王瑞新; 姜楠
Source Publication哈尔滨工程大学学报
Other AbstractThe research sought an investigation of the effect of multi-scale coherent eddy structures on scale- similar LES (large eddy simulation) sub-grid model of turbulence flow. The main focus of the study examined the valid scale range of LES scale-similar sub-grid model, as well as its evolution in normal-wall direction across turbulent boundary layer. Time sequence signals of longitudinal velocity component at different normal-wall positions in turbulent boundary layer are measured by IFA300 constant temperature anemometer and hot-wire probe with sampling resolution higher than the frequency that corresponds to the smallest time scale of turbulence. Multi-scale coherent eddy structures are extracted from turbulent fluctuating velocity signals by locally-averaged velocity structure function and conditional sampling method. Velocity fluctuating signals, including or excluding coherent eddy structures, are separated respectively. A comparsion of scale-correlation factors with and without multi-scale coherent eddy structures was performed. The mechanism of kinetic and momentum transfer in turbulence was revealed utilizing the concept of multi-scale coherent eddy structure. There is a scale range where scale similarity is valid. The scale where LES scale-similar sub-grid model is valid must be smaller than the maximum energetic scale.
Keyword壁湍流 多尺度相干结构 大涡模拟 尺度相似亚格子模型
Subject Area湍流
Indexed ByCSCD ; EI
Funding Organization国家自然科学基金重点资助项目(10832001);国家 973 计划资助项目(2012CB720101)
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Document Type期刊论文
Corresponding Author姜楠
Recommended Citation
GB/T 7714
王瑞新,姜楠. 相干结构的尺度相似性与尺度相似亚格子模型[J]. 哈尔滨工程大学学报,2012,33(10):1283-1288.
APA 王瑞新,&姜楠.(2012).相干结构的尺度相似性与尺度相似亚格子模型.哈尔滨工程大学学报,33(10),1283-1288.
MLA 王瑞新,et al."相干结构的尺度相似性与尺度相似亚格子模型".哈尔滨工程大学学报 33.10(2012):1283-1288.
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