Spanwise variations in nominally two-dimensional rough-wall boundary layers

被引：0
作者：
R. T. Reynolds
P. Hayden
I. P. Castro
A. G. Robins
机构：
[1] University of Southampton,School of Engineering Sciences
[2] Lockheed Martin Aeronautics,Advanced Development Programs
[3] University of Surrey,Fluids Research Centre
来源：
Experiments in Fluids | 2007年 / 42卷
关键词：
Wind Tunnel; Roughness Element; Roughness Sublayer; Stagger Array; Streamwise Turbulence Intensity;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Laboratory experiments have been conducted in two separate boundary layer facilities to investigate steady spanwise variations in mean velocity discovered during studies of developing flows over regular arrays of large roughness elements. Regular spanwise variation was found with a steady wavelength, moderated by the growing boundary layer, which was an integer multiple of the repeating unit of roughness. Amplitude variations greater than ±5% in the mean were found over the roughness and greater than ±10% in turbulence quantities. Due to the dominating nature of this phenomena throughout the layer, care should be taken in undertaking local measurements aimed at identifying flow variations caused by roughness heterogeneity.
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页码：311 / 320
页数：9
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