对日本建筑学会提供的室外无污染物扩散和有污染物扩散的建筑风洞实验模型,采用15种湍流模型分别求解其室外流场,通过模拟结果与风洞实验结果的对比分析,确定建筑室外风环境数值模拟所用的最优湍流模型.结果表明,Suga三次式高Re k-ε模型对风场和浓度场的求解具有很高的精度,是最优的模拟室外风环境的湍流模型,不足之处是该模型的计算时间比标准k-ε模型长.因此,对建筑室外风环境进行CFD数值模拟时,在时间允许的情况下可采用Suga三次式高Re k-ε模型,在计算精度要求不高及计算时间有限的情况下,可采用标准k-ε模型.

Aiming at the wind-tunnel experimental models with and without gas dispersion provided by the Architectural Institute of Japan（AIJ）,15 turbulence models are employed to simulate the outdoor wind environment.Then,by the comparison between the simulated results and the wind-tunnel experimental ones,the optimal turbulence model for the numerical simulation of outdoor wind environment around a building is determined.The results show that Suga's cubic high-Re k-ε model is the best due to its high accuracy of simulating both the air flow and the pollutant diffusion,but the CPU time of it is longer than that of the standard k-ε model.Thus,during the CFD numerical simulation of the outdoor wind environment of a building,Suga's cubic high-Re k-ε model can be used when the time is enough,and the standard k-ε model can be used when high accuracy is not required and when the calculation time is limited.