About turbulence statistics in the outer part of a boundary layer developing over two-dimensional surface roughness
About turbulence statistics in the outer part of a boundary layer developing over two-dimensional surface roughness
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关于在二维表面粗糙度上发展的边界层外部的湍流统计
DOI：
10.1063/1.4737658
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发表时间：
2012
影响因子：
4.6
通讯作者：
Vladislav Efros
中科院分区：
文献类型：
--
作者：
P. Krogstad;Vladislav Efros
根据汤森的壁面相似假设，研究了表面粗糙度对高雷诺数湍流边界层的影响。关于表面粗糙度对外层流动结构的影响，文献中存在相互矛盾的信息。在由跨距杆组成的粗糙度上的流动似乎显示出壁面和尾流区之间异常强烈的相互作用。结果表明，由于边界层厚度给出的粗糙度尺度与最大尺度之间缺乏尺度分离，因此在外层表现出较强的改变性。记录了整个层中显著粗糙度影响的流动之一是边界层，其发展超过由沿跨距排列的方棒组成的粗糙度。在这里，我们比较了在相对较低的雷诺数下拍摄的一种这样的流动与在较高的雷诺数下发展的边界层的测量结果。较高的雷诺数(Reθ=32-600)确保...
The influence of surface roughness on a high Reynolds number turbulent boundary layer is investigated in the light of Townsend's wall similarity hypothesis. There is conflicting information in the literature about the effect of surface roughness on the flow structure in the outer layer. Flows over roughness consisting of spanwise rods appear to show unusually strong interaction between the wall and the wake region. It has been suggested that flows which show strong modifications in the outer layer suffer from lack of scale separation between the roughness scale and the largest scale given by the boundary layer thickness. One of the flows which have documented significant roughness effects across the entire layer is the boundary layer developing over roughness made up of spanwise aligned square bars. Here we compare one such flow taken at relatively low Reynolds number with measurements for a boundary layer which develops at much higher Reynolds number. The high Reynolds number (Reθ = 32 600) assures that ...
影响因子：
2.4
作者：
M. Amir;I. Castro
通讯作者：
M. Amir;I. Castro