A DNS of a Turbulent Flow in a Rough-Wall Channel Using Roughness Elements Model
A DNS of a Turbulent Flow in a Rough-Wall Channel Using Roughness Elements Model
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使用粗糙度单元模型研究粗糙壁通道中湍流的 DNS
DOI：
10.1299/jsmeb.43.233
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Yasuaki Agata
中科院分区：
文献类型：
--
作者：
Y. Miyake;K. Tsujimoto;Yasuaki Agata
对由粗糙壁和光滑壁组成的通道内的湍流进行了直接数值模拟。粗糙壁面是用零体积壁面法线表示的粗糙度元素来建模的，从壁面延伸到壁面单元的15-30左右，产生Stokes阻力到局部流动。基于两壁平均摩擦速度和通道半宽的全局雷诺数为400。本文将粗糙度模型与现有的实验结果进行比较，以证明其有效性。结果表明，该模型较好地再现了实验得到的平均流量，并且粗糙度单元顶部以上层的粗糙度对湍流的影响与实验结果在质量上是一致的。
A Direct Numerical Simulation (DNS) is conducted for a turbulent flow in a channel bounded by one rough and another smooth wall. Rough wall is modeled by roughness elements represented by zero-volume wall-normal lines extending from the wall surface to around 15-30 in wall unit, which generate Stokes drag to the local flow. Global Reynolds number based on the mean friction velocities on two walls and channel half width is 400. It is inteded here to demonstrate the validity of the roughness model, comparing the obtained flow with available experimental results. It was confirmed that the model reproduces the experimentally obtained mean flow satisfactorily and that turbulence modification by roughness in the layer above the top of roughness elements is qualitatively coincident with the experimental results.