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The structure of the vorticity field in turbulent channel flow. Part 1: Analysis of instantaneous fields and statistical correlations

机译:湍流通道中涡流场的结构。第1部分:瞬时场分析和统计相关性

摘要

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 attains its maximum at about 45 deg to the wall. Two point correlations of velocity and vorticity fluctuations strongly support a flow model consisting of vortical structures inclined at 45 deg to the wall. The instantaneous vorticity vectors plotted in planes inclined at 45 deg 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 of transverse vortex filaments.
机译:利用大型涡流模拟技术生成的数据库,对湍流通道中发夹式涡流的存在进行了研究。结果表明,涡流矢量的倾斜角远离壁,在距壁约45度处达到最大值。速度和涡度涨落的两点相关性有力地支持了由与壁成45度倾斜的涡流结构组成的流动模型。在以45度倾斜的平面上绘制的瞬时涡度矢量表明,流动中包含相当数量的发夹。涡流线用于显示发夹的三维结构,该结构由横向涡流丝变形产生。

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  • 作者

    Kim J.; Moin P.;

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  • 年度 1984
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