南京信息工程大学学报2012，Vol.4Issue(4)：330-333,4.
近壁湍流边界层相干结构形成的动力学分析
Dynamic analysis of coherent structures formation in a near-wall turbulent boundary layer
摘要
Abstract
The theoretical model of symmetrical and asymmetrical coherent structures in a near-wall turbulent boundary layer is established through study into the impulsive disturbance on the wall in this paper. Theoretical mechanism and evolution process of the coherent structures formation are studied by Direct Numerical Simulation (DNS ). The numerical result reveals that asymmetrical coherent structures are more likely to grow than symmetrical coherent structures,due to the larger span wise velocity induced by asymmetrical coherent structures in the near-wall area. And the dynamical mechanics of the coherent structures in the near-wall turbulent boundary layer vary with different distributions of initial structure. The proposed model relatively represents the real condition of fluid motion,and will help to improve the understanding of the dynamical mechanics of single coherent structure formation in the near-wall turbulent boundary layer.关键词
近壁湍流边界层/壁面脉冲扰动/相干结构Key words
near-wall turbulent boundary layer/impulsive disturbance/coherent structure分类
航空航天引用本文复制引用
沈露予,陆昌根,赵玲慧..近壁湍流边界层相干结构形成的动力学分析[J].南京信息工程大学学报,2012,4(4):330-333,4.基金项目
国家自然科学基金(10872097) （10872097）
国家863计划专项(2009AA03Z107) （2009AA03Z107）
