摘要
对正弦波动来流条件下三维复杂结构建筑物表面风压分布进行了风洞实验测量和数值模拟研究.通过对风洞动力系统的变频调节,实现了正弦来流的周期和振幅变化.采用Realizablek-ε(模型和SIMPLE算法进行了数值模拟.结果显示:来流的正弦波动对建筑表面的风压分布具有显著的影响,与定常平均来流对比,风压系数变化平均达15%,局部最大值达45%;正弦来流对屋面各测点风压系数的影响程度随正弦来流周期的减小而增大,随来流振幅的增加而增大;受影响较大的测点出现在屋面迎风侧流动分离区.
Surface wind-pressure of three-dimensional and complex building structures under sinusoidal inflow is analyzed with numerical simulation and wind tunnel test method. Different inflow conditions with different periods and amplitude are achieved via frequency control. Realizable κ-ε model of turbulence and SIMPLE method is adopted in numerical simulation with corresponding inflow condition to the test. Both the result of the test and simulation show that the effect of sinusoidal inflow on wind pressure is remarkable. Difference of pressure coefficient between sinusoidal and steady inflow is about 15% on an average and 45% as the maximum. The fluctuation increases with the decrease of inflow periods and increase of inflow amplitude. Notable fluctuation appears in the windward region where flow separation occurs.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2009年第2期246-251,共6页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
国家“十五攻关”西部专项(2004BA901A21)
新疆维吾尔自治区“十五攻关”重大项目(200433121)
关键词
风压系数
正弦波动
风洞实验
数值模拟
wind pressure coefficient
sinusoidal variation
wind tunnel test
numerical simulation
