薄膜结构风致耦合作用数值初探  

Numerical investigation on fluid-structure interaction of membrane structure

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：《计算力学学报》2010年第3期422-427,共6页Chinese Journal of Computational Mechanics

基　　金：国家杰出青年基金(50725826)资助项目

摘　　要：采用迭代耦合的数值方法,结合有限元离散,对典型马鞍面封闭式薄膜结构的风致耦合作用进行了模拟研究,并对结构风致振动特性以及流场对结构振动的影响进行了探讨。数值结果表明,结构的平均位移与边界条件、风荷载分布及结构的振动形式有关;而脉动位移则与风场的涡形、演化规律以及结构形式的关系明显。钝体膜结构上出现周期性脱落的漩涡。在极低的预应力条件下,由于漩涡与结构的相互作用,薄膜上的结构振动呈现"行波"效应,薄膜上各部分的振动特性有明显区别,气流分离、漩涡脱落强烈以及"行波"尾端鞭梢效应明显的区域,脉动位移幅值及其振动频率较大。An interaction between enclosed saddle-shaped membrane and wind is numerically simulated using iterative method to study structural vibration and the interaction＇s effects on membrane＇s wind response.It is shown from numerical results that,structural average displacement could be affected by boundary conditions,wind loads distribution and structural vibration characteristics.Dynamic displacement could be obviously affected by vortex pattern and its shading behavior.Periodic vortex shading appeared on the structure under wind exiting.When the membrane was weakly prestressed,rolling membrane waves could be induced by these vortexes.Vibration characteristics of different position on the membrane vary significantly.Usually,strong and fierce vibration could be observed where airflow separates and wind vortexes shade dramatically,also in the region rolling waves excite whipping effect.

关 键 词：薄膜结构 流固耦合 CFD 有限元 

分 类 号：TU973.3[建筑科学—结构工程]