Turbulent characteristics of flow field over a three-dimensional steep hill
Turbulent characteristics of flow field over a three-dimensional steep hill
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三维陡山流场湍流特性
DOI：
10.5359/jawe.1997.73_3
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
K. Hibi
中科院分区：
文献类型：
--
作者：
Y. Meng;K. Hibi
本文用分裂光纤探针研究了具有余弦平方横截面和最大坡度约为32°的圆形山丘上的湍流流动，该探针是为测量高湍流和分离流动而设计的。三个速度分量的平均值和方差的配置文件，并与未受干扰的（无山）边界层。湍流边界层在波峰后分离，并在背风坡脚处重新附着。不仅在山顶，而且在其一侧的中坡，水流速度也明显加快。纵向和垂向速度方差的最大扰动出现在山体高度（z/h=1），对应于山体背风坡上的分离回流，而横向速度方差的最大扰动出现在山体以外z/h=0.125的高度，对应于壁层的低频运动。
The turbulence flow over a circular hill, having a cosine-squared cross-section and a maximum slope of about 32°, was investigated using split-fiber probes designed for measuring flows with a high turbulence and separation. Profiles of the means and variances for the three velocity components are presented and compared with those in the undisturbed (no- hill) boundary layer. The turbulent boundary layer separated behind the crest and reattached just at the lee foot of hill. The pronounced speed- up of flow occurs not only at the hilltop but also at the midway slope on its side. The maximum perturbations in the longitudinal and vertical velocity variances were observed at the height of hill (z/h=1), corresponding to the separated recirculating flow on the lee slope of the hill, while the maximum in the lateral velocity variance appeared at the height of z/h=0.125 beyond the hill, corresponding to the low-frequency motion in the wall layer.