建筑架空设计优化与气流组织模拟

Overhead Design Optimization and Airflow Simulation in Buildings

通过CFD采用标准RNG k-ε模型模拟了4种工况下1.5 m高度的气流组织情况,并得出以下结论:采用架空层设计,能够有效减小建筑周边的涡流以及风影区面积,并有利于形成穿越建筑的穿堂风,缩短了空气滞留时间,从而改善建筑及周围区域的风环境;同时通过对不同架空层高度的对比分析,发现随着架空层高度的增加,建筑周边涡流以及风影区面积将进一步减小,区域整体气流越平稳,建筑周边风速提升越大,使得通风效果改善越明显.因此可以通过对架空层高度的合理布置,营造出适合人员活动的建筑风环境.

By means of the CFD using standard RNG k-epsilon model to simulate the working condition of four types of the air distribution of 1.5 m height, it draws the following conclusion such as： the overhead layer design can effectively reduce the eddy current and the area of the wind shadow area around the building. And it helps to form a wind blows through the building, it shortens the air retention time, and improves the wind environment of the building and the surrounding area. At the same time through the comparative analysis of the height of different overhead layers, it is found that the vortex around the building increases with the increase of the height of the overhead layer. The area of the wind shadow area is further reduced, the more stable the overall airflow in the area, and the greater the wind speed around the building, the more obvious the improvement of the ventilation effect. Therefore, the reasonable arrangement of the height of the overhead layer can be used to create a building wind environment suitable for personnel activities.