某大跨水雪综合体风荷载CFD数值模拟研究

Numerical study on the wind load of a long-span water and snow complex

首先选取CAARC高层建筑标准风洞试验为标杆进行了CFD模拟,将模拟结果与试验值进行对比,验证采用RNG k-e湍流模型配合Scalable壁面函数能够较为准确的模拟钝体绕流问题。以某水雪综合体为研究对象,采用CFD模拟的方法得到该结构的平均风压系数及流场分布,结合流线图对结构风压力及风吸力产生的原因进行了详细分析,最后将CFD数值计算结果与风洞试验进行对比验证,为该屋盖结构和类似大跨度屋盖结构的抗风设计提供参考。在项目设计初期,可采用CFD数值模拟得出为结构选型及初步设计提供依据,后续再根据风洞试验结果进行结果的复核,既能在风洞试验完成前保证了项目的顺利推进,又能有效地辅助结构工程师从结构抗风的安全性和经济性角度进行合理的方案优选。

First,a CFD numerical simulation of the benchmark wind tunnel test CAARC high-rise building is carried out to validate the numerical model.Taking a water and snow complex as the research object,the average wind pressure coefficient and flow field distribution of the structure are obtained.The causes of wind pressure and wind suction of the structure are studied elaborately.Finally,the numerical results are compared with the wind tunnel test results.The results and the study methods provides reference for the wind resistant design of the structure and similar large-span roof structures.In the early stage of the design,CFD can be used to provide the basis for structural selection and preliminary design,which can not only ensure the progress of the project before the wind tunnel test,but also effectively assist the structural engineers from the perspective of structural wind resistance safety and economy.