Natural ventilation effect and pollutant concentration distribution of a building room with deep concave facade

Taking a deep concave facade building room with a dominant wind direction of lateral wind in Xi’an as the research object, the multi-scale CFD simulation of outdoor field to indoor field is carried out through the transition field model, and the indoor air quality under different window opening modes is studied. The results show that the full-opening window has a good effect on the discharge of indoor pollutants, but its resistance to outdoor pollutants is not as good as that of the single-opening flat wall window. When the indoor pollutants are concentrated in a single room, the convection ventilation formed by opening windows will increase the concentration of pollutants in other rooms without pollution sources. When the pollutants are scattered in each room, convection ventilation can effectively reduce the concentration of pollutants in each room by about 50%. Single-opening a flat wall window can effectively prevent outdoor pollutants from entering the room, and increasing the air outlet area is the best way to discharge indoor pollutants.