基于欧拉多相流模型的桥梁主梁三维风驱雨数值研究  

3D NUMERICAL SIMULATION OF WIND-DRIVEN RAIN ON BRIDGE DECK SECTIONS BASED ON EULERIAN MULTIPHASE MODEL

作　　者：刘顺[1] 黄生洪[2] 李秋胜[1,3] 陈伏彬[4] LIU Shun HUANG Sheng-hong LI Qiu-sheng CHEN Fu-bin(College of Civil Engineering, Htman University, Changsha, Hunan 410082, China University of Science and Technology, School of Engineering Science, Hefei, Anhui 230026, China City University of Hong Kong, Department of Architecture and Civil Engineering, Hong Kong 999077, China School of Civil Engineering and Architecture, Changsha University of Science ＆ Technology, Changsha, Hunan 410114, China)

机构地区：[1]湖南大学土木工程系,湖南长沙410082 [2]中国科学技术大学工程科学系,安徽合肥230026 [3]香港城市大学建筑学与土木工程学系,香港999077 [4]长沙理工大学土木与建筑学院,湖南长沙410114

出　　处：《工程力学》2017年第4期63-71,共9页Engineering Mechanics

基　　金：国家基金面上项目(51378484);国家自然科学基金重大研究计划项目(91215302);交通运输部科技项目(2011318824140);湖南省创新平台与人才计划项目(2015RS4050);中国博士后基金项目(2015M572238);湖南省教育厅一般项目(15C0054);长沙理工大学桥梁工程安全控制省部共建教育部重点实验室开放基金项目;长沙理工大学"土木工程"重点学科项目

摘　　要：该文利用欧拉多相流模型,对矩形断面和准流线型断面的桥梁主梁进行了三维风驱雨数值模拟计算。通过计算,得到了桥梁主梁周围风雨流场的分布和主梁上雨滴平均冲击荷载分布,并重点探讨了降雨对桥梁主梁断面三分力系数的影响以及来流攻角和湍流强度的变化对风驱雨效应的影响。通过和相关风洞试验数据的比较,验证了欧拉多相流方法在桥梁工程风驱雨研究中的有效性和便利性,为桥梁工程风驱雨研究提供了一个新的手段。通过分析发现,降雨会影响桥梁主梁的三分力系数,但雨滴对主梁的平均冲击荷载相对于风荷载而言较小,影响并不显著;攻角和湍流强度的变化对风驱雨效应的影响亦不明显。The Eulerian multiphase model was used for the numerical simulation of wind-driven rain（WDR） on bridge deck models of rectangular cross-section and streamline-liked section in this paper. Through numerical computation, the wind-driven rain field around bridge deck sections and rain-induced impact loads on bridge sectional surfaces were investigated. The emphasis was laid on the analysis of precipitation effect on the aerodynamic coefficients of bridge models. In the process of the analysis, the change of attack angle and the change of turbulence intensity of inlet were taken into account. By comparison with available experimental data, the reliability and flexibility of the WDR simulation approach based on the Eulerian multiphase model were verified. Furthermore, it is demonstrated that the present method is an effective tool for numerical evaluations of WDR in bridge engineering. After analysis and demonstration, it is shown that the raindrops have no obvious influence on the aerodynamic coefficients because the impact loads of raindrops acting on bridge surfaces are small. Moreover, the effects of attack angle and turbulence intensity on the results of WDR are limited.

关 键 词：欧拉多相流模型 桥梁主梁 风驱雨 冲击荷载 三分力系数 攻角 湍流强度 

分 类 号：U441[建筑科学—桥梁与隧道工程]