Abstract: To study the influence of ambient wind on smoke diffusion at the bottom of concave exterior walls of high-rise residential buildings, the characteristics of smoke such as temperature, speed and concentration in concave walls of high-rise residential buildings were simulated numerically. Take the ratio of the length of the side wall and the distance between the side walls of the groove of the outer wall as the structural factor, different working conditions were set for comparative analysis. It is found that the temperature at different heights of the same structural factor is exponentially distributed under different wind speeds.The relationship model between critical wind speed of flue gas leaving the central wall of the building and the size of the structural factor was obtained to guide the dimension design of concave exterior wall of high-rise residential buildings. The rupture time of the bottom window is relatively the maximum when the structural factor is 1.

Key words: high-rise building, concave exterior wall, wind speed, structural factor, smoke diffusion