下击暴流下立方体建筑物表面风压数值模拟  

Numerical simulation of surface wind pressure of cube building under downburst

作　　者：柳广义 吉柏锋[1] 瞿伟廉[1] 杨庆山[2] LIU Guangyi;JI Baifeng;QU Weilian;YANG Qingshan(Hubei Key Laboratory of Roadway Bridge and Structure Engineering,Wuhan University of Technology,Wuhan 430070,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,湖北武汉430070 [2]重庆大学土木工程学院,重庆400045

出　　处：《华中科技大学学报（自然科学版）》2020年第5期37-41,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51308430,51438002)。

摘　　要：为研究不同湍流模型和壁面处理方法的组合对立方体建筑物在下击暴流风场中的风压系数模拟结果的影响,基于冲击射流模型建立下击暴流计算域,通过物理试验结果对模拟结果进行验证与对比分析.采用两种不同的网格划分方案,满足ANSYS-Fluent中对于不同壁面处理方法的壁面Y+值的要求.研究结果表明:在选用增强壁面处理情况下,剪切应力运输(SST)k-ω湍流模型在迎风面和背风面与试验结果符合较好,但是屋盖的模拟结果与试验结果相差较大;当选用标准壁面函数时,雷诺应力模型(RSM)展现出了与试验结果较符合的建筑物中线风压系数曲线.当模拟立方体建筑物在下击暴流风场中的表面风压时,相比其他湍流模型和壁面处理方法的组合,RSM湍流模型和标准壁面函数可以得到更好的数值模拟结果.To study the effects of different combinations of turbulent models and wall treatment methods to the simulation results of the wind pressure coefficients of cube building under downburst,a computational domain of downburst was built based on the impinging jet model,and the simulation results were verified and compared with the results of physical experiments.Two plans of mesh distribution were adapted to satisfy the requirements of ANSYS-Fluent code,in which different wall treatment methods could satisfy the different value ranges of wall Y+.Research results show that when the enhanced wall treatment is adopted,numerical results from shear-stress transport(SST)k-ωturbulent model are in good agreement with the experiment results on the windward and leeward,while the simulation results of roof are quite different from the experiments;when the standard wall function is selected,Reynolds stress model(RSM)turbulent model can provide a more similar curve of wind pressure coefficient with the experiment data on the centerline of building.When the wind pressures of cube building are simulated,compared with other combinations of turbulence models and wall treatment methods,the RSM turbulence model and the standard wall function can obtain better numerical simulation results.

关 键 词：下击暴流 数值模拟 风压系数 湍流模型 壁面处理方法 

分 类 号：TU312.1[建筑科学—结构工程]