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Towards prediction of wind load on pylons for a neutral atmospheric boundary layer flow over two successive hills
Journal of Wind Engineering and Industrial Aerodynamics ( IF 4.8 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.jweia.2020.104402
Adib Karim , Thacker Adrien , Astruc Dominique , Moulin Y. Frédéric

Abstract In strong wind situations for a neutral atmospheric boundary layers, wind loads on pylons depend on both the mean velocity and the turbulence fluctuations, predicted by analytical models only for simple topographies. For complex topographies, only experiments or numerical simulations give access to the local flow conditions around the pylon. We present experimental and numerical results using a RANS model for the parametric study of the flow near two successive hills of height H and width L for varying distance λ between the tops. We focus on the modification of flow conditions on the second hill by the presence of the first hill. For λ / H ≥ 19.2 , the first hill does not modify the flow structure around the second hill. For decreasing values of λ / H below 19.2, a secondary turbulence intensity peak appears on the frontal part of the second hill. It is associated with the impact of the mixing layer generated at the top of the first hill, whose development is well described by analytical models of the planar mixing layer. These analytical models yields simple estimations of the turbulent kinetic energy k for the pylon’s wind load calculations. Different hill slopes and height ratios are also investigated.

中文翻译:

预测两个连续山丘上的中性大气边界层流的塔架风荷载

摘要 在中性大气边界层的强风情况下,塔架上的风荷载取决于平均速度和湍流波动,分析模型仅针对简单地形预测。对于复杂的地形,只有实验或数值模拟才能访问塔周围的局部流动条件。我们使用 RANS 模型提供实验和数值结果,用于参数研究两个高度为 H 和宽度为 L 的连续山丘附近的流动,以改变顶部之间的距离 λ。我们专注于通过第一个山丘的存在来修改第二个山丘上的流动条件。对于 λ / H ≥ 19.2 ,第一个山丘不会改变第二个山丘周围的流动结构。对于低于 19.2 的 λ / H 值降低,二级湍流强度峰值出现在第二个山峰的正面。它与第一个山丘顶部产生的混合层的影响有关,平面混合层的分析模型很好地描述了其发展。这些分析模型为塔架的风荷载计算产生了对湍流动能 k 的简单估计。还研究了不同的山坡和高度比。
更新日期:2021-01-01
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