Numerical Research On Building Indoor And Outdoor Wind Environment

People spent 80%~90% of their time indoors in modern society, and the deterioration of indoor air quality and energy crisis have frequently occurred, which makes natural ventilation driven by natural wind be concerned increasingly important by people. Natural ventilation is one of the effective ways that could improve indoor air quality and reduce energy consumption of building. The main purpose of this paper is to analyze the influences of building height on the natural ventilation capacity and variation regularity of outdoor wind environment in different architectural layout, and moreover, analyze the variation regularity of how the indoor environment changes with outdoor wind environment and provide theory and application foundation for the design and optimization assessment of urban city plan.The result of the influence of building height on its natural ventilation shows that the different part of building has different natural ventilation capacity. With the increasing of the building height, the capacity of natural ventilation increased, and the maximum of wind pressure difference between windward and leeward appears at the 80% of the building height from ground, which then dropped significantly. Therefore, the best place of single building wind-sided natural ventilation is at the 80% of the building height.By analyzing the outdoor and indoor wind environment at different layouts of construction distribution, it can be found that the change of the outdoor wind environment has significant influence on the indoor air environment. Among the basic types of construction (parallel, stagger, encircled), both the capacity of indoor natural ventilation and the outdoor air environment of the stagger type at pedestrian height, which calculated from the stagger model, are closest to the single building of non-interference environment. Finally, Network mathematical calculation method, ContanW model and CFD model are used in this paper in order to compare and analyze the indoor natural ventilation of typical buildings of sun 100 Hunan University Teachers' apartments under wind pressure. The comparative analysis results has proved that the CFD model used I this paper is correct.