周  骥，  李元齐，  张其林
(同济大学建筑工程系，上海200092)

[摘要] 选用Realizable к-ε 和RNG к-ε 两种湍流模型对大气边界层中球壳的定常风流场进行了数值模拟，并将计算结果与风洞试验进行了比较。结果表明，Realizable к-ε 模型和RNG к-ε 模型均能为工程应用提供有效的参考，并可以在一定程度上对荷载规范进行补充。对于球壳，数值模拟的精度基本可以达到工程应用的要求。这为空间曲面钝体绕流现象的数值模拟提供了依据。比较而言，RNC к-ε 模型的计算结果更为合理。
[关键词]  计算风工程；球壳；数值模拟

Numerical simulation of 3D steady flow around a sphere shen
zhou Ji, Li Yuanqi, Zhang Qilin
(Department of Building Engineering, Tongji Univeysity, Shanghai 200092, China)

Abstract: The 3D steady wind flow-field of a sphere shell immersed into atmosphere houndary is numerically sinulated based on two turbulence models, Realizable к-ε model and RNG к-ε model. The detailed comparison between numerical simulation and wind tunnel tests is given. The results show that hoth moclels can give useful results fmm the point of engineering application, although the results obtained from the RNG к-ε model are relatively more reasonable. At the same time, the precision of the numerical simulation can satisfy the demand of engineering application for the shell. Moreover, these results can make up loads code to some extent and provicle efficiert information for structures with patial curve surface.
Keywords: commputational wind engineering;  sphere shell;  numerical simulation