Wind-Tunnel Reproduction of Nonuniform Terrains Using Local Roughness Zones
Wind-Tunnel Reproduction of Nonuniform Terrains Using Local Roughness Zones
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DOI：
10.1007/s10546-023-00822-0
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发表时间：
2023-08
影响因子：
4.3
通讯作者：
Nasrollah Alinejad;Sungmoon Jung;Grzegorz Kakareko;Pedro L. Fernández-Cabán
中科院分区：
文献类型：
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作者：
Nasrollah Alinejad;Sungmoon Jung;Grzegorz Kakareko;Pedro L. Fernández-Cabán
大气边界层流动的风洞模拟主要包括简化的（纯均匀的）逆风地形条件。这种方法更容易执行，但可能无法复制现场的真实风特性。本文提出了一种在风洞中模拟非均匀地形的方法，并对该方法产生的风场特性进行了研究。所提出的方法采用局部粗糙区，其中给定的地形被划分成具有近似均匀的粗糙长度的子区域。接下来，在风洞中用均匀粗糙度元素表示每个子区域。然而，总体逆风取风将由不同高度的粗糙度元素组成。为了研究由该方法产生的风特性，在佛罗里达大学自然灾害工程基础设施实验设施的边界层风洞中模拟了9个不同的真实场地，使用可自配置（自动化）粗糙度元素网格。与传统的等效统一表示相比，纵向平均速度，湍流强度，风谱，和积分长度尺度廓线的相似性和差异的报告和讨论。特别是，一个显着的差异被观察到的高阶矩的纵向速度分量，这表明需要进一步研究在非均匀地形下的风荷载。
Wind-tunnel modeling of Atmospheric Boundary Layer flows has primarily consisted of simplified (purely uniform) upwind terrain conditions. This approach is easier to carry out but may not replicate the true wind characteristics of the site. This paper proposes a method to simulate nonuniform terrains in a wind-tunnel and investigates the wind characteristics produced by the method. The proposed method employs the local roughness zones where the given terrain is divided into sub-areas with an approximately uniform roughness length. Next, each sub-area is represented in the wind-tunnel with uniform roughness elements. However, the overall upwind fetch will be composed of roughness elements of various heights. To study the wind characteristics produced by the method, nine different real-world sites were simulated in the Boundary Layer Wind Tunnel at the University of Florida Natural Hazard Engineering Infrastructure Experimental Facility, using a self-configurable (automated) roughness element grid. Compared with the conventional equivalent uniform representation, similarities and differences in the longitudinal mean velocity, turbulence intensity, wind spectrum, and integral length scale profiles are reported and discussed. In particular, a significant difference was observed for the higher-order moments of the longitudinal velocity component, which indicates the need for further studies in wind loads under nonuniform terrains.