The Impact of Changing Regulation Plans on Outdoor Ventilation Studied by Computational Fluid Dynamics

The transformation processes in transitional cities are often so accelerated that the urban analysis of micro climatic parameters is set aside. This is particularly dangerous in the valley cities, such as Sarajevo, struggling with poor air quality. The causes of the poor air quality are numerous, but mainly related to traffic emissions and use of fossil fuels for domestic heating. The focus of this paper is on the correlation between urban morphology on one side and wind permeability, ventilation efficiency and related pollution level on another. We have employed CFD simulation to investigate the air pollutant dispersion in a district of Sarajevo for scenario of low wind (1 m/s) for three different urban forms. The results show significant time and spatial variations in air pollutant concentration for three urban forms. This research is stressing out general importance of incorporating realistic micro-climatic simulations (CFD being one of them) in the urban planning procedures in Sarajevo, as a mandatory control mechanism, prior to the implementation or variation of any urban and regulation plan.