EXPERIMETAL STUDY OF CHARACTERISTICS OF ROUGH-SURFACE BOUNDARY LAYER PAST GENTLE HILLS
EXPERIMETAL STUDY OF CHARACTERISTICS OF ROUGH-SURFACE BOUNDARY LAYER PAST GENTLE HILLS
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平缓丘陵地区粗糙地表边界层特征的实验研究
DOI：
10.2208/prohe.45.241
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
Daisaku Yokota
中科院分区：
文献类型：
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作者：
A. Nakayama;Daisaku Yokota
通过风洞试验研究了不同粗糙度高度的缓弯丘陵边界层的湍流特性。平均速度分布结果表明，缓坡坡面无流动逆转，压力梯度和边界曲率效应与表面粗糙度几乎是独立作用的，存在与平面粗糙边界层相似的壁律。然而，表面粗糙度可以软化压力梯度对平均速度和湍流应力的影响。此外，已知在固体表面附近具有高度各向异性的湍流应力由于表面粗糙度而变得更加各向同性。
Turbulence characteristics of boundary layers past gently curved hills with varying roughness height have been studied by wind-tunnel experiments. The results of the mean velocity distributions indicate that for the gently sloped hills, where no flow reversal occurs, the pressure-gradient and boundary curvature effects and the surface roughness act almost independently and the wall-law similarity similar to the rough boundary layers on flat surface exists. The surface roughness, however, is seen to soften the pressure-gradient effects on both mean velocity and turbulent stresses. Furthermore, the turbulence stresses that are known to be highly anisotropic near the solid surface are made more isotropic due to the surface roughness.