基于分区交错算法，通过对商业流体软件Fluent和结构计算软件Ansys的二次开发，搭建了高层建筑风振数值模拟平台。耦合界面上非匹配网格的搜索配对和数据传递，以及流体域的网格更新均采用UDF (user defined functions) 编程实现；流体计算采用大涡模拟方法配合使用流体并行计算技术，以兼顾计算效率和精度，通过UDF和Scheme语言编程实现流体域参数化求解，为确保流体和结构域时间步长一致，流体计算采用子迭代技术；结构计算采用APDL (Ansys parametric design language) 语言参数化编程；采用Visual C++语言编制数值模拟平台主进程实现模块间的相互调用。采用本文方法，对大气紊流边界层风场内方形截面高层建筑的风振气弹响应进行了数值模拟，将计算结果与气弹模型风洞试验和文献数值模拟结果进行了对比；还通过有、无考虑气动弹性时结构位移响应的比较，分析了气动阻尼对结构风振响应的影响。结果表明，本文数值模拟方法可以较精确地求解高层建筑结构的风振气弹响应问题。
Abstract
In this paper, a numerical simulation platform for fluid-structure interaction (FSI) problems of tall building structures was constructed by secondary development for commercial codes Fluent and Ansys. Conventional partitioned coupling scheme, equipped with subcycles for the fluid field calculation, was adopted in present study. The user defined functions (UDF) were used to implement mesh updating for the fluid field, and the matching & data transferring for the non-matching meshes on the coupled boundaries of the building structures. Large eddy simulation technique and parallel computation method was adopted to solve the fluid field accurately and efficiently, based on UDF and Scheme programming. The Ansys parametric design language (APDL) was programmed to solve the structural motions. Visual C++ programming was applied to mutual calling among modules of present solution procedure. Wind-induced vibrations of a square section tall building immersed in atmospheric boundary layer were numerically investigated by using present method. The simulated results were compared with those of aeroelastic model wind tunnel experiment and previous numerical simulation. By comparison of the simulated results with and without considering FSI, aerodynamic damping effect on wind-induced vibration of the building was analyzed. The results show that present method is verified to be applicable in numerically solving wind-induced aeroelastic responses of tall building structures.
关键词
数值模拟； /
流固耦合； /
分区交错算法； /
风致振动； /
高层建筑
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Key words
numerical simulation
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fluid-structure interaction /
partitioned coupling scheme /
wind-induced vibration /
tall buildings
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参考文献
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