Direct numerical simulation of turbulent channel flow up to Reτ ≈ 5200
Direct numerical simulation of turbulent channel flow up to Reτ ≈ 5200
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DOI：
10.1017/jfm.2015.268
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发表时间：
2015-07-01
影响因子：
3.7
通讯作者：
Moser, Robert D.
中科院分区：
文献类型：
--
作者：
Lee, Myoungkyu;Moser, Robert D.
本文对摩擦雷诺数为5186的不可压槽道流动进行了直接数值模拟，结果表明，槽道流动具有高雷诺数壁面湍流的一些特征。例如，观察到平均速度具有对数变化的区域，其中冯卡门常数K = 0.384 +/- 0.004。展向速度分量的方差也有对数相关性，但流向分量没有。在大的外层结构和小的内层结构之间存在明显的尺度分离。在离壁面中等距离处，流向和展向速度脉动的一维谱在波数（k）的短范围内表现出k（-1）依赖性。此外，与以前的实验观察一致，当这些光谱乘以k（预乘光谱）时，它们具有双峰结构，局部峰位于k（-1）范围两侧的波数处。
A direct numerical simulation of incompressible channel flow at a friction Reynolds number (Re-tau) of 5186 has been performed, and the flow exhibits a number of the characteristics of high-Reynolds-number wall hounded turbulent flows. For example, a region where the mean velocity has a logarithmic variation is observed, with von Karman constant K = 0.384 +/- 0.004. There is also a logarithmic dependence of the variance of the spanwise velocity component, though not the streamwise component. A distinct separation of scales exists between the large outer layer structures and small inner-layer structures. At intermediate distances from the wall, the one-dimensional spectrum of the streamwise velocity fluctuation in both the streamwise and spanwise directions exhibits k(-1) dependence over a short range in wavenumber (k). Further, consistent with previous experimental observations, when these spectra are multiplied by k (premultiplied spectra), they have a bimodal structure with local peaks located at wavenumbers on either side of the k(-1) range.