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山脉地形下击暴流风场数值模拟
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Numerical Simulation of Downburst Wind Field under Continuous Mountains
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    山区是下击暴流多发区域,为了研究下击暴流作用下连续山脉地形的风场特性,采用大涡模拟(LES)分析了山脉高度、间距等地貌因素对特征位置风场的影响.结果表明:山脉高度大于50 m时,山脚及山顶位置径向极值风速的大小随山脉高度增加而逐渐减小;山顶的加速效应主要受山高影响,其加速因子在近地面较大,而山脚的加速效应在上部空间较大;双山脉时,后山脉对前山脉湍流度的变化影响不明显,后山脉的湍流度呈现出随山脉间距扩大而先增大后减小、随前山脉高度增加而逐渐增大的变化规律.

    Abstract:

    Mountainous areas are the regions where downburst often occurs. In order to study the wind field characteristics of continuous mountains under the downburst, the influence of height, distance and other geomorphic elements on the wind field of the characteristic position was analyzed by Large Eddy Simulation (LES). The results show that when the height of the mountain was greater than 50 m, the radial extreme wind speed at the foot of the mountain and the crest gradually reduced as the height of the mountain increasesd. The speed-up effect at the crest was significantly affected by mountain height,and the acceleration factor was larger near the ground,while the acceleration effect was larger in the upper space at the foot of mountain. For the two mountains, the rear mountain had less effect on the turbulence intensity of the front mountain, but the turbulence of the rear mountain ranges increased firstly and then decreased with the augment of the mountain distance and augmented gradually with the height increases of the front mountain.

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汪之松?覮,唐阳红,方智远,思建有.山脉地形下击暴流风场数值模拟[J].湖南大学学报:自然科学版,2019,46(3):90~98

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  • 在线发布日期: 2019-03-26
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