Small-scale statistics in direct numerical simulation of turbulent Channel flow at high-Reynolds number
Small-scale statistics in direct numerical simulation of turbulent Channel flow at high-Reynolds number
复制标题
高雷诺数湍流通道流直接数值模拟中的小尺度统计
DOI：
10.1088/1742-6596/318/2/022016
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Y. Kaneda
中科院分区：
文献类型：
--
作者：
K. Morishita;T. Ishihara;Y. Kaneda
采用高分辨率直接数值模拟方法研究了槽道湍流中的小尺度统计特性，摩擦雷诺数Re τ= 2560。二阶速度统计的惯性子范围的对数低区域被发现是不远的Kolmogorov的普遍平衡理论所预测的，虽然协议是不完美的。剪切参数S* 随离壁面的距离y+而减小，当y+> 400时，S*<0.1，其中S* 是Kolmogorov时间尺度与平均剪切时间尺度的比值。对于较大的Re τ，S* 的y+依赖性更接近于对数低区域中的简单理论估计。
Small-scale statistics in turbulent channel flow are studied by high resolution direct numerical simulations with the friction Reynolds number up to Re τ= 2560. The second order velocity statistics in the inertial subrange of the log-low region are found to be not far from those predicted by Kolmogorov's universal equilibrium theory, although the agreement is not perfect. The shear parameter S* decreases with the distance y+ from the wall and S*≲ 0.1 in y+> 400 for large Re τ, where S* is the ratio of the Kolmogorov time scale to the mean shear time scale. For larger Re τ, the y+-dependence of S* is closer to a simple theoretical estimate in the log-low region.