基于流体有限元法与大涡模拟技术的建筑风场与风效应分析  

Analysis of Building Wind Field and Wind-induced Effect by Fluid FEM and LES Technique

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作  者:周岱[1] 刘光众[1] 马骏 韩兆龙[1] 黄橙[3] 

机构地区:[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]上海申迪建设有限公司,上海200120 [3]北京市建筑设计研究院有限公司,北京100045

出  处:《建筑科学与工程学报》2013年第2期1-8,129,共8页Journal of Architecture and Civil Engineering

基  金:国家自然科学基金项目(51078230;11172174);上海市优秀学术带头人计划项目(13XD1402100)

摘  要:把流线迎风Petrov-Galerkin(SUPG)稳定化方法和三步方法与动态亚格子模型相结合,建立了一种基于任意拉格朗日-欧拉描述、可用于结构周围风场特性和风压分布分析的动态亚格子大涡模拟方法,基于该方法并运用分区交替求解算法分析流固耦合相互作用问题。对流场的空间离散,采用速度和压力的同阶插值函数;对流场的时间离散,运用具有二阶精度的三步格式稳定化有限元方法。利用Newmark逐步积分方法计算结构域,运用弹簧近似法进行网格域网格更新。对结构风效应和结构周围三维风场绕流及其特性进行了数值模拟,归纳总结了结构风效应和三维风场绕流的一些规律。结果表明:就网壳算例而言,考虑流固耦合模型效应后可以得到更高的风压系数。Large eddy simulation (LES) combined with fluid finite element method (FEM) was developed by introducing the dynamic sub-grid scale model and the streamline upwind Petrov- Galerkin (SUPG) stabilized method to predict wind flow feature, wind pressure and wind-induced effect of typical building structures based on Arditrary Lagrange-Euler method. The partitioned solution strategy was adopted to calculate fluid-structure interaction. Through fluid field analysis, the same order interpolation was employed for spatial discretization of both fluid velocity and pressure, and the temporal discretization was carried out by stabilized three-step technique with the second order accuracy. Newmark integral approach based on finite element formulation was introduced for structural computation, and spring analogy method was introduced for the grid update. Finally, the wind-induced structural effect and three-dimensional wind flow past buildings with typical shapes were simulated and analyzed, and some laws were concluded. The results show that the higher wind pressure coefficient can be obtained by considering fluid-structure interaction for the case of reticulated shell.

关 键 词:风场 风效应 稳定化有限元法 大涡模拟 流固耦合 

分 类 号:TU973.23[建筑科学—结构工程]

 

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