Direct Numerical and Large-Eddy Simulations of Turbulent Flows over Rough Surfaces
Direct Numerical and Large-Eddy Simulations of Turbulent Flows over Rough Surfaces
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粗糙表面湍流的直接数值和大涡模拟
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
R. Antonia
中科院分区：
文献类型：
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作者：
S. Leonardi;F. Tessicini;P. Orlandi;R. Antonia
在Re = 6.9 × 10 ~ 3条件下，对单壁有横向方杆的槽道湍流进行了直接数值模拟（DNS）和大涡模拟（LES）。Smagorinsky，与货车Driest阻尼，和动态子网格模型已被使用。对于壁面上的压力和表面摩擦力以及壁面附近的均方根速度，两种类型的模拟之间有令人满意的一致性。远离壁面，LES仅给出DNS获得的均方根分布的近似值。然而，相对于不使用模型（对应于未解析的DNS），子网格模型是一个显著的改进。在Re = 1.2 × 104下进行了另一次DNS，目的是将结果与Hanjalic，K.，和Launder，B. E、“平面通道中充分发展的非对称流”，《流体力学杂志》，第51卷，1972年，第110页。301-335）。平均值和均方根分布之间的一致性良好。讨论了雷诺数的依赖性（Re范围为2.8 × 103 ~ 1.2 × 104）。壁面上的压力以及形状阻力与雷诺数无关，当Re > 6.9 x 103时，速度分布略有变化。
Direct numerical simulations (DNS) and large-eddy simulations (LES) of a turbulent channel flow with transverse square bars on one wall have been carried out at Re = 6.9 x 103. Both the Smagorinsky, with Van Driest damping, and dynamic subgrid models have been used. There is satisfactory agreement between the two types of simulations for the pressure and skin friction on the wall and the rms velocity near the wall. Far from the wall, LES gives only an approximation of the rms distributions obtained by DNS. However, the subgrid models are a significant improvement relative to when no model is used (which corresponds to an unresolved DNS). Another DNS at Re = 1.2 x 104 has been performed with the aim of comparing the results with the experiment by (Hanjalic, K., and Launder, B. E., "Fully Developed Asymmetric Flow in Plane Channel," Journal of Fluid Mechanics, Vol. 51, 1972, pp. 301-335). The agreement between mean and rms distribution is good. The Reynolds-number dependence (Re ranging from 2.8 x 103 to 1.2 x 104) has been discussed. The pressure on the wall and hence the form drag do not depend on Reynolds number, and the velocity profile changes slightly for Re > 6.9 x 103.