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LES study of topographical effects of simplified 3D hills with different slopes on ABL flows considering terrain exposure conditions
Journal of Wind Engineering and Industrial Aerodynamics ( IF 4.8 ) Pub Date : 2021-01-13 , DOI: 10.1016/j.jweia.2020.104513
Qingshan Yang , Tong Zhou , Bowen Yan , Min Liu , Pham Van Phuc , Zhenru Shu

The oncoming turbulence is of particular importance with respect to the investigation of the turbulent flow fields over hilly terrain, which plays an essential role regarding the optimization of micro-siting of the wind farm and reasonable structural design of wind turbines. In this study, large-eddy simulations (LES) are performed to elucidate the effects of wind shear coefficients (WSCs) and upstream turbulence intensities (TIs) on the complex wind flow fields over the simplified 3-D hills. Systematical analysis of the wind turbulence properties related to the micro-siting and fatigue loads of wind turbines, including fractional speed-up ratio (SUR), terrain-induced TI, velocity spectrum and wind speed probability density function, is performed in a quantitative manner. Stronger non-Gaussianity is identified in the wake of gentle-sloped and moderate-sloped hills, which is weakened by increased WSC and enhanced TI. In addition, remarkable SURs are observed mostly at the summit of a steep-sloped hill near the hill surface, and the fractional speed-up factor is found to increase significantly under higher WSC and larger TI. Furthermore, the influence of topography on the wind direction field is also examined, which shows little dependence on the WSCs and TIs.



中文翻译:

考虑地形暴露条件的不同坡度的简化3D丘陵对ABL流的地形影响的LES研究

对于研究丘陵地形上的湍流场而言,即将到来的湍流特别重要,这对于优化风电场的微选址和风力涡轮机的合理结构设计起着至关重要的作用。在这项研究中,进行了大涡模拟(LES),以阐明风切变系数(WSC)和上游湍流强度(TI)对简化的3D丘陵上复杂风流场的影响。以定量方式对与风力涡轮机的微选址和疲劳载荷相关的风湍流特性进行系统分析,包括分数加速比(SUR),地形引起的TI,速度谱和风速概率密度函数。在坡度中等和坡度中等的丘陵之后,发现了更高的非高斯性,这通过增加WSC和增强TI来减弱。此外,主要在靠近山坡表面的陡坡山顶观察到明显的SUR,并且发现在较高的WSC和较大的TI下,分数加速因子会显着增加。此外,还检查了地形对风向场的影响,表明对WSC和TI的依赖性很小。

更新日期:2021-01-14
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