哈尔滨工程大学学报2012，Vol.33Issue(10)：1283-1288,6.DOI:10.3969/j.issn.1006-7043.201107051
相干结构的尺度相似性与尺度相似亚格子模型
Scale similarity of coherent structures and scale-similar sub-grid model
摘要
Abstract
The 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.关键词
壁湍流/多尺度相干结构/大涡模拟/尺度相似亚格子模型Key words
wall-bounded turbulence/ multi-scale coherent eddy structures/ LES (large eddy simulation)/ scalesimilar sub-grid model分类
数理科学引用本文复制引用
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):1283-1288,6.基金项目
国家自然科学基金重点资助项目(10832001) （10832001）
国家973计划资助项目(2012CB720101). （2012CB720101）
