Databases from direct numerical simulations of fully developed turbulent channel flow were used to examine the relation between skin‐friction on the wall and streamwise vortices observed near the wall. It is shown that the wall shear rate correlates with streamwise vortices near the wall and that the maximum correlation occurs downstream and with lateral displacement from the location of skin‐friction measurement. Conditionally‐averaged statistics taken near high skin‐friction regions indicate that the higher skin‐friction values are associated with streamwise vortices located closer to the wall. Visual studies of the time evolution of near‐wall streamwise vortices and skin‐friction on the wall also indicate that the high skin‐friction footprints on the wall can be attributed to streamwise vortices.

中文翻译：

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湍流边界层中近壁流涡与壁表皮摩擦的关系

资料库 从全面开发的直接数值模拟中 湍流通道 用来检查墙壁上的皮肤摩擦与顺流之间的关系 旋涡在墙壁附近观察到。结果表明，墙体的剪切速率与流向相关。旋涡在壁附近，最大的相关性发生在下游，并且与皮肤摩擦测量位置的横向位移有关。在高皮肤摩擦区域附近进行的条件平均统计表明，较高的皮肤摩擦值与流向相关旋涡位于更靠近墙壁的位置。近壁流时间演化的可视化研究旋涡 墙壁上的皮肤摩擦也表明，墙壁上较高的皮肤摩擦足迹可归因于 漩涡。