基于LES模型的近地脉动风场数值模拟  

LARGE EDDY SIMULATION OF NEAR GROUND TURBULENT WIND FIELD

作　　者：朱伟亮[1] 杨庆山[1] 

机构地区：[1]北京交通大学土木工程学院,北京100044

出　　处：《工程力学》2010年第9期17-21,共5页Engineering Mechanics

基　　金：国家杰出青年基金项目(50725826);国家自然科学基金重大研究计划重点支持项目(90815021)

摘　　要：符合近地脉动风场特性的LES脉动入口条件是准确模拟结构表面时变风压的必要条件。该文基于LES模型对平板湍流边界层进行模拟,采用周期边界条件实现脉动输入,并将顺压力梯度引入流体控制方程以维持湍流边界层的稳定。数值结果表明,采用周期边界条件可成功实现脉动输入,边界层在顺压力梯度下的自保持性良好,可满足工程需求。顺流向平均流速剖面以及湍流强度剖面均满足低湍流下的风场特性,数值结果可为我国B类地貌下抗风研究采用。Turbulent inflow is required for the simulation of time-dependent pressure on bluff body-shaped civil engineering structures. In present study, the turbulent inflow is achieved by means of periodic boundary condition which is set at the inlet plane of a turbulent developed flat plate. A constant streamwise pressure gradient is introduced to NS equation to balance the wall shear stress. Reasonable numerical result of turbulent inflow is drawn from present calculation, and streamwise velocity profile is successfully preserved by the pressure gradient. Turbulent boundary layer in present simulation holds characteristics of near ground wind field with low turbulent intensity, and the result can serve as a reference for wind resistant research in open area.

关 键 词：结构工程 结构抗风 大涡模拟 湍流边界层 压力梯度 入流边界 

分 类 号：TU973.213[建筑科学—结构工程]