The Influence Of The Hole Characteristics Of Upstream Building To Wind Force Ventilation Potential Of Downstream Building

Building wind environment and natural ventilation mainly explore the laws of airflow movement and pollutant diffusion between buildings and inside and outside buildings.In this paper,the interaction between the two buildings,the most basic unit,is extracted,and the characteristics of the openings of the upstream buildings and the layout of the planning between the buildings are discussed.The hole characteristics in this paper are defined as the size of the opening area and the opening position.The research methods used were wind tunnel flow experiments and Computational Fluid Dynamics(CFD)simulation.The paper is divided into three parts: first,through the wind tunnel experiment,the influence of the characteristics of the holes in the upstream building on the wind pressure of the downstream building surface is discussed.Then,by comparing with the experimental data of wind tunnel,the simulation reliability and accuracy of CFD method under different hole characteristics were studied.Finally,the influence of different building layouts on the surface pressure of downstream buildings and the ventilation potential of different window types are studied.The experimental results show that the influence of different open Windows on the surface wind pressure of the downstream buildings is different.When the opening rate of the upstream building is less than 20%,it has little influence on the windward surface wind pressure of the downstream building.CFD simulation results show that the SST k--viscosity model shows the highest reliability in such porous problems.The accuracy of the same model for different hole characteristics is also different,among which the M10 W case is the most accurate(average error 11%),while the M20 W case cannot be reproduced(average error 298%).The study of different building placement shows that when the relative horizontal spacing between buildings is no more than 0.5 times the building length and the vertical spacing is no more than 2.5 times the building width,the upstream building has a greater impact on the surface wind pressure of the downstream building.The conclusion of this paper provides reference for natural ventilation design and location planning of perforated buildings,and CFD simulation method can be used for numerical simulation of similar airflow.