摘要
针对建筑物风场的高雷诺数特点 ,采用离散涡法 ,分析了高层建筑物的非定常分离流问题 .通过引入奇异点技术摆脱了保角变换的处理过程 ,使离散涡法能适应于复杂形状的钝体结构 .数值模拟了流场的变化特征 ,分析了各种攻角下 ,具有方形截面的高层建筑的升力系数、抗力系数和Strouhal数 .计算分析表明 ,离散涡法具有计算速度快及精度高的特点 ,可以刻画出流场的流动特征 ,透视到流动机理 。
In accordance with the characteristics of high Reynolds number for building wind field, the discrete vortex model is developed to analyze the unsteady separated flow of a tall building with rectangular cross section. The flow is assumed to be a potential flow except in the region of the free shear layers which are shed downstream from the separation points, the region and the building are represented by discrete vortices. The present discrete vortex model combined with singularity method can be easily applied to a building with complicated shape. The characteristics of wind field are numerically simulated, the lift and drag coefficients and Strouhal numbers are analyzed for several angles of attack. The results show that the discrete vortex model can provide a powerful tool for depicting the field character and flow mechanism in building wind engineering.
出处
《华中科技大学学报（城市科学版）》
CAS
2002年第1期73-77,共5页
Journal of Huazhong University of Science and Technology
关键词
离散涡
旋涡脱落
高层建筑
结构风工程
discrete vortex
vortex shedding
tall building
wind engineering
