Asocijacija za korporativnu bezbednost , Skoplje , North Macedonia
In this paper are presented simulations of three scenarios of fire in the car in canyon shaped streets: Fire on symmetrical canyon street; Fire on step rising canyon street; Fire on step decreasing canyon street. Special consideration in the paper is given to FDS tool, as it is used for simulation. It requires parameters like compute domain, geometry of object, thermic capabilities of building materials, types and capabilities present flammable materials, start location of fire, amount of released heat.Dynamic of fire in canyon street is analyzed without wind influence. Results of simulation of these three scenarios show that all fire products caried with its thermic capabilities are leaving street canyons. In case if there is wind on the roof of street canyons, flow of fire product is returned into the street. Depending on the wind speed fire products are returned in the street beside building on the windy side of street or they reach street level and climb up by the building on the other side of street. Due to the building height difference and increased recirculation caused whirlwinds, under wind influence, largest pollution is in case of step increasing streets. Concentrations od fire products on pedestrians’ levels depend on amount of present air around fire start point, caused by whirlwinds, under wind influence.
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