Modeling the neutrally stable atmospheric boundary layer for laboratory scale studies of the built environment
Modeling the neutrally stable atmospheric boundary layer for laboratory scale studies of the built environment
复制标题
为建筑环境的实验室规模研究建立中性稳定大气边界层模型
DOI：
10.1016/j.buildenv.2011.09.026
复制
发表时间：
2012
影响因子：
7.4
通讯作者：
Z. Baratian
中科院分区：
文献类型：
--
作者：
A. Karimpour;N. Kaye;Z. Baratian
大气边界层的特性影响着城市地区的一系列物理现象，如建筑物的风荷载、风驱动的通风流动、污染扩散以及松散碎片的升空和运输。为了在实验室尺度上精确模拟ABL速度剖面，在风洞或水槽中确定剪切速度u_（max）、表面粗糙度z 0和零平面位移d是很重要的。目前用于建立这些参数的技术是基于边界层表面几何形状的分析或迭代曲线拟合技术，该技术使用平均速度和/或湍流动能分布，偶尔与z 0的经验相关性相结合。提出了一种新的计算对数流速剖面参数的曲线拟合方法。这种新方法直接从时间平均速度剖面数据中计算u_（max）、z_0和d，只需两步，无需任何迭代。的新方法和其他可用的方法应用到一系列的速度分布测量在空气和水中的结果之间的比较。比较表明，虽然新方法需要更少的数据和更少的步骤，它计算的u和z 0具有更高的精度比现有的技术，和d与现有的技术具有相同的精度。
The properties of the atmospheric boundary layer (ABL) influence a range of physical phenomena in urban areas such as wind loading on buildings, wind-driven ventilation flows, pollution dispersion, and the lift off and transport of loose debris. In order to accurately model the ABL velocity profile at laboratory scale, it is important to establish the shear velocity u∗, surface roughness z0, and zero plane displacement d in either a wind tunnel or water flume. Current techniques for establishing these parameters are based on either an analysis of the boundary layer surface geometry or iterative curve fitting techniques that use mean velocity and/or turbulent kinetic energy profiles, occasionally combined with empirical correlations for z0. A new curve fitting method for calculating these logarithmic velocity profile parameters is presented. This new method calculates u∗, z0, and d directly from time-averaged velocity profile data in just two steps without any iteration. A comparison is presented between the results of the new method and other available methods applied to a range of velocity profile measurements in air and water. The comparison shows that, although the new method requires less data and fewer steps, it calculates u∗and z0with greater accuracy than existing techniques, and d with equivalent accuracy to existing techniques.