Evaluation of the effect of semi-open spaces on the ventilation of indoor spaces and the distribution of fine dust

Fine dust is one of the environmental challenges, which disturb human comfort. Wind is the main factor in the movement of fine dust, and the movement pattern of wind is affected by the architecture of cities. semi-open spaces such as balconies has an effect on the nature of wind and fine dust flow. The purpose of this research is to compare the distribution of wind flow and fine dust in the interior plan, with three variables: location, proportions of balconies and partitioning of interior.Study was done by CFD. K-Omega-SSD turbulence model is used. In order to the software data (the size and type of particles) and software validation, the field sampling method has been used. Research findings show that the design of balconies has a better performance against ventilation. On the other hand, shallow balconies with a wider opening are more suitable. Also, the presence of an internal partition has a positive effect on the ventilation of spaces. The results show that the design of the balconies at the entrance and exit of the wind flow increases the number of suspended particles. The design of these balconies with a shallower depth and a wider opening lowers particle with smaller sizes in the interior spaces with a higher percentage. Also, the design of closed spaces, compared to the design of open spaces, improves the design in dealing with the flow of fine dust.