Abstract
The presence of the roof structure affects airflow patterns around the building. The recirculation area formed in the roof area is different from the original due to the presence of parapets and billboards. So the traditional formula no longer applies. Pollutant gases emitted by buildings can accumulate in recirculation areas, causing air short circuits and polluting indoor air. However, studies on the flow characteristics of building roofs with parapets are still lacking. In this paper, cfd simulation is used to study the influence of parapets of different heights and summer thermal effects on airflow. The results show that as the height of the parapet increases, the size of the vortex generated at the top also increases gradually. As the temperature difference between the top and the air increases, that is, the Ri increases, the vortices formed on the top will decrease significantly and the amount of reduction is not linear with the temperature difference.
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