Effects of Wind and Adjacent High Rise on Natural Smoke Extraction in an Atrium with Pitched Roof

The effects of wind and adjacent high rise on natural smoke extraction in a pitched roof atrium were investigated numerically by Large Eddy Simulation. The soot volume fraction combined with the velocity field were analyzed. Results show that adjacent high rise without wind has little effect on natural smoke extraction. The vents facing the wind directly lose their exhaust capacity. The weakening degree of extraction effectiveness under back wind with high rise is nearly the same as under front wind without high rise. A strong recirculation is formed between the leeside of the roof and its adjacent high rise and finally almost no smoke is exhausted in this condition.