CFD-based comparative simulation analysis of flow field under different natural ventilation boundary conditions in the room

In order to achieve reasonable indoor layout design, reduce building energy consumption and better meet human body thermal comfort requirements, flow fields under different natural ventilation conditions are compared based on computational fluid dynamics (CFD) in this paper. Firstly, a theoretical model of the indoor flow field under six different ventilation conditions is constructed, and boundary conditions, wall functions and meshing structure are confirmed. Simulation analysis is carried out for six different working conditions. Through comparative analysis, it is concluded the window opening location should be located in the center, and the direct airflow through the convection field is evenly distributed, and the direct airflow is conducive to the improvement of indoor cleanliness. In addition, when organizing natural ventilation, the window orientation is inclined to the dominant wind direction in summer by about 45° angles, it can improve the ventilation effect. And by analyzing temperature contours, 45° angles can better meet people’s needs about temperature: 18 ℃–26 ℃. When temperature contours’ temperature is above people’s comfortable temperature in specific rooms or places, mechanical ventilation and evaporative cooling can be combined. Research results can not only significantly improve the quality of living and working environments, but also help promote the development of green buildings and achieve energy-saving and emission reduction goals.