Data underlying the publication: Direct numerical simulation of turbulent open channel flow

==============================================================================DNS DATA OF TURBULENT CLOSED AND OPEN CHANNEL FLOWIN BOXES OF Lx/h = 12pi, Lz/h = 4pi FOR Re_tau = 200,400,600,900 ==============================================================================Authors: C. Bauer, Y. Sakai &amp; M. Uhlmann correspondence: [e-mail]: Bauer, C., Sakai, Y., Uhlmann, M. (2024). <em>Direct numerical simulation of turbulent open channel flow: Streamwise turbulence intensity scaling and its relation to large-scale coherent motions.</em> Progress in turbulence X, Springer proceedings in physics 404, p. 311-317, https://doi.org/10.1007/978-3-031-55924-2_42Bauer, C., Sakai, Y., Uhlmann, M. (2025). <em>How far does the influence of the free surface extend in turbulent open channel flow?</em>. Flow Turbulence Combust. https://doi.org/10.1007/s10494-025-00665-4Numerical Method: Kim, Moin &amp; Moser, 1987, J. Fluid Mech. vol 177, 133-166 ---------------------------------------------------------------------------------------------------------------------------- The data was obtained from direct numerical simulations of open and closed channel flow using a pseudo-spectral method which solves the wall-normal velocity/vorticity formulation of the Navier-Stokes equation introduced by Kim et al (1987). The flow domain contains Nx*Ny*Nz grid points with equidistant grid spacing in x and z direction and a Chebyshev-Gauss-Lobatto (CGL) grid in y direction. Note that the open channel flow simulations feature a grid refinement towards both the no-slip and the free-slip boundary condition.----------------------------------------------------------------------------------------------------------------------------For detailed information see data-sheet-ocf.pdf and data-sheet-ccf.pdf

针对摩擦雷诺数（Re_tau）分别为200、400、600、900的封闭渠槽与明渠湍流流动的直接数值模拟（DNS）数据集，计算域尺寸设置为Lx/h=12π、Lz/h=4π

作者：C. Bauer、Y. Sakai 与 M. Uhlmann；通讯邮箱：[e-mail]

参考文献：
1. Bauer C, Sakai Y, Uhlmann M (2024) 明渠湍流的直接数值模拟：流向湍流强度标律及其与大尺度相干结构的关联。见：《湍流研究进展X》，Springer物理学会议丛书第404卷，第311-317页，https://doi.org/10.1007/978-3-031-55924-2_42
2. Bauer C, Sakai Y, Uhlmann M (2025) 明渠湍流中自由表面的影响范围有多广？《流动、湍流与燃烧》，https://doi.org/10.1007/s10494-025-00665-4

数值方法：采用Kim、Moin与Moser于1987年提出的算法（发表于《流体力学杂志》第177卷，第133-166页）
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本数据集基于明渠与封闭渠槽湍流的直接数值模拟（DNS）所得，采用伪谱法求解Kim等人（1987）提出的壁面法向速度/涡量形式的纳维-斯托克斯（Navier-Stokes）方程。计算域采用Nx×Ny×Nz的网格拓扑，x、z方向采用等间距网格布置，y方向采用切比雪夫-高斯-洛巴托（Chebyshev-Gauss-Lobatto, CGL）网格。需注意，明渠流动的数值模拟同时针对无滑移边界与自由滑移边界实施了网格加密策略。
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详细信息请参阅data-sheet-ocf.pdf与data-sheet-ccf.pdf