Turbulence Structure in Rough and Smooth Wall Boundary Layers
Turbulence Structure in Rough and Smooth Wall Boundary Layers
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DOI：
10.1007/978-3-540-72604-3_13
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发表时间：
2006-11
期刊：
影响因子：
--
通讯作者：
R. Volino;M. Schultz;K. Flack
中科院分区：
文献类型：
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作者：
R. Volino;M. Schultz;K. Flack
表面粗糙度在许多实际应用中发挥着重要作用，研究粗糙度效应可以深入了解湍流边界层的本质。Raupach等人[1]注意到几项研究中的一个共识，即粗糙和光滑壁边界层的外部区域中的流动与边界层厚度δ和壁面摩擦速度上的比例相似。因此，壁面通过壁面剪切设置边界条件，并且外部区域在所有情况下的响应相似。这一现象与佩里和马鲁西克[2]的分离涡模型一致，分离涡只受近壁湍流的间接影响。Krogstad等人[3]然而，注意到外部流动的显著差异。最近，Kunkel和Marusic [4]和Flack et al. [5]湍流统计显示外部区域的各种粗糙表面的相似性。本工作考虑湍流结构，通过频谱，旋流强度和湍流量的两点相关性。
Surface roughness plays an important role in many practical applications, and the study of roughness effects can provide insight into the nature of turbulent boundary layers. Raupach et al.[1] noted a consensus among several studies that the flow in the outer region of both rough and smooth wall boundary layers scale similarly with the boundary layer thickness, 6, and the wall friction velocity, up Hence, the wall sets the boundary condition via the wall shear, and the outer region responds similarly in all cases. This behavior is consis-tent with the Perry and Marusic [2] model of detached eddies which are only indirectly influenced by the near wall flow. Krogstad et al.[3], however, noted significant differences in the outer fiow. More recently, Kunkel and Marusic [4] and Flack et al.[5] presented turbulence statistics showing outer region similarity for a variety of rough surfaces. The present work considers turbulence structure, as shown through spectra, swirl strength and two point correlations of turbulence quantities.