下击暴流空间相关性风场模拟  

Simulation of downburst wind field with spatial correlation

作　　者：张文福[1,2] 谢丹[1] 刘迎春[1,2] 计静[1,2] 

机构地区：[1]东北石油大学土木建筑工程学院,大庆163318 [2]黑龙江省防灾减灾及防护工程重点实验室,大庆163318

出　　处：《振动与冲击》2013年第10期12-16,35,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(51178087);黑龙江省教育厅科学技术研究项目(12511Z004);黑龙江省科技计划项目(GA09A408)

摘　　要：考虑时间衰减性研究了下击暴流平均风速与空间观测点位置的关系,并给出了空间中四个点的平均风速随时间的分布情况。在确定性-随机性混合模型的基础上,利用Wood竖向风剖面模型和Holmes水平径向风剖面模型模拟出空间七点处的平均风速,并采用AR模型生成具有时间相关性和空间相关性的脉动风速,从而获得下击暴流空间相关性风场。通过脉动风相关函数及功率谱的对比表明,该方法具有较高的精度。Considering the time decay, the relationship between downburst average wind speed and space observation point location was studied, and the average wind speed distribution of 4 spatial points was given. Based on deterministic-stochastic hybrid model, average wind speed samples at 7 spatial points were simulated by using Wood vertical wind profile model and Holmes horizontal radial wind profile model, and fluctuating wind speed samples with time correlation and spatial correlation were obtained by using AR model. Then the downburst wind field with spatial correlation was obtained. Numerical results of the comparisons of correlation function and PSD indicate that the proposed method is of high precision.

关 键 词：下击暴流 风场模拟 空间相关 AR模型 

分 类 号：TU311[建筑科学—结构工程]