The structure of the vorticity field in turbulent channel flow. Part 1. Analysis of instantaneous fields and statistical correlations
The structure of the vorticity field in turbulent channel flow. Part 1. Analysis of instantaneous fields and statistical correlations
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DOI：
10.1017/s0022112085001896
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发表时间：
1985-06
影响因子：
3.7
通讯作者：
P. Moin;Jong-S. Kim
中科院分区：
文献类型：
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作者：
P. Moin;Jong-S. Kim
利用大涡模拟技术生成的数据库对槽道湍流中发夹涡的存在性进行了研究。结果表明，远离壁面，涡量矢量倾角分布在与壁面成45°左右时达到最大值。速度和涡量波动的两点相关性强有力地支持由与壁面成45°倾斜的涡结构组成的流动模型。在倾斜45°的平面上绘出的瞬时涡量矢量表明，流动中含有相当数量的发夹。涡线被用来显示三维结构的发夹，这是显示所产生的变形（或卷起）的横向涡片。
An investigation into the existence of hairpin vortices in turbulent channel flow is conducted using a database generated by the large-eddy simulation technique. It is shown that away from the wall the distribution of the inclination angle of vorticity vector gains its maximum at about 45° to the wall. Two-point correlations of velocity and vorticity fluctuations strongly support a flow model consisting of vortical structures inclined at 45° to the wall. The instantaneous vorticity vectors plotted in planes inclined at 45° show that the flow contains an appreciable number of hairpins. Vortex lines are used to display the three-dimensional structure of hairpins, which are shown to be generated from deformation (or roll-up) of sheets of transverse vorticity.