论文标题
平面通道流过渡状态的流量统计
Flow Statistics in the Transitional Regime of Plane Channel Flow
论文作者
论文摘要
研究了平面通道流的过渡状态{上面}的过渡点，该过渡点使用了大域中的直接数值模拟，而湍流未持续。据报道，层状扰动时空间歇性的统计数据。首先表征了该模式的几何形状，包括与实验相比的层状扰动条纹角度的统计数据。然后提供局部和瞬时散装速度，壁剪应力和湍流动能的高阶统计。两个以前的量的分布具有非平凡的形状，其特征是大峰性和/或偏度。有趣的是，我们观察到它们的峰度与它们的偏度平方之间存在很强的线性相关性，通常在完全湍流方面的雷诺数较高。
The transitional regime of plane channel flow is investigated {above} the transitional point below which turbulence is not sustained, using direct numerical simulation in large domains. Statistics of laminar-turbulent spatio-temporal intermittency are reported. The geometry of the pattern is first characterized, including statistics for the angles of the laminar-turbulent stripes observed in this regime, with a comparison to experiments. High-order statistics of the local and instantaneous bulk velocity, wall shear stress and turbulent kinetic energy are then provided. The distributions of the two former quantities have non-trivial shapes, characterized by a large kurtosis and/or skewness. Interestingly, we observe a strong linear correlation between their kurtosis and their skewness squared, which is usually reported at much higher Reynolds number in the fully turbulent regime.
