A computational study was performed to investigate the effect of varying upwind tree heights on the wind flow over a 15-m high, flat-roof building. It is shown that trees can have a significant effect on the mean wind speed and turbulence over the roof and should be included when performing a computational fluid dynamics simulation. The calculations also provide guidance for undertaking wind tunnel experiments on simulated trees and buildings to investigate their interaction. The effect of the trees on the mean wind speed above the roof was not a monotonic function of ratio of tree-to-building height. Further, the trees reduced the level of turbulence over the roof. The study also confirmed that the production of turbulent kinetic energy by the trees and its subsequent advection over the building are the main causes of the modified flow.

中文翻译：

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树木对建筑物上气流的影响的计算研究

进行了一项计算研究，以研究不同的迎风树高度对15米高的平屋顶建筑上的风流的影响。结果表明，树木会对屋顶的平均风速和湍流产生重大影响，在进行计算流体动力学模拟时应将树木包括在内。这些计算也为在模拟树木和建筑物上进行风洞实验以研究其相互作用提供了指导。树木对屋顶上方平均风速的影响不是树木与建筑物高度之比的单调函数。此外，树木减少了屋顶上的湍流程度。研究还证实，树木产生的湍动能及其随后在建筑物上的平流是导致水流变化的主要原因。