建筑结构学报2018，Vol.39Issue(2)：114-121,8.DOI:10.14006/j.jzjgxb.2018.02.013
基于大涡模拟直筒-锥段型钢结构冷却塔风压非高斯特性研究
Non-Gaussian wind pressure of cylindrical-cone steel cooling tower based on large eddy simulation
摘要
Abstract
With a proposed super large cylindrical-cone steel cooling tower (189 m) as an example,distribution of the non-Guassian features of fluctuating wind pressure was studied and the formation mechanism of non-Gaussian property was researched.Numerical wind tunnel test was conducted by adopting large eddy simulation (LES) method to obtain the flow field characteristics and stress time history.The simulation results were compared with the results from field measurements and wind tunnels at home and abroad,showing the rationality of LES method to obtain the wind loads on this type of cooling tower.Typical wind pressure probability density curve and histograms and aerodynamic force time history were employed to identify the local regions in which the wind pressure fluctuations exhibit non-Gaussian nature.The cause for non-Gaussian features is discussed by the correlation between non-Gaussian features and vortex motion.Research shows that:the wind pressures from the region of extreme negative pressure to the region of flow separation are largely non-Gaussian in the conical and cylindrical parts.In the leeward region,wind pressures of the cylindrical part largely obey Gaussian distribution,while the wind pressures of the conical part are generally non-Gaussian.关键词
直筒-锥段型钢结构冷却塔/脉动风压/大涡模拟/非高斯特性/形成机理Key words
cylindrical-cone steel cooling tower/fluctuating wind pressure/large eddy simulation/non-Gaussian feature/formation mechanism分类
建筑与水利引用本文复制引用
柯世堂,王浩..基于大涡模拟直筒-锥段型钢结构冷却塔风压非高斯特性研究[J].建筑结构学报,2018,39(2):114-121,8.基金项目
国家自然科学基金项目(U1733129),江苏省优秀青年基金项目(BK20160083),江苏省六大人才高峰计划项目(JZ-026). （U1733129）
