wind tunnel simulation on the pedestrian level and investigation of flow characteristics around buildings

Wind flow has a significant role in the design of buildings in urban spaces. the purpose of this study is to determine the wind velocity at the pedestrian-level conditions (plc) of a tall building in urban environments. at first, this paper discusses wind aerodynamic investigation based on the architectural design. then, patterns of wind flow behaviour at pedestrian level and shape optimization strategies are considerate. wind tunnel test and cfd approach are conducted to study the wind condition and characteristics at a golsar street in rasht. the suggested tall new building in this research, is located in the centre of the site with an area about of 11000 m². in order to evaluate the wind velocity, the predicted results are compared with actual building specifications data to study the discrepancy between the two phases. the results of the first phase for actual building specifications data showed that wind velocity is more than comfortable environment (<7 m/s). in the next phase, to reduce the vortices and wind velocity to an acceptable level of comfort, planting the tree around the site is used to solve the problem. moreover, frequency oscillations and wind velocity have been measured; then simulation results are also compared. the findings showed that planting trees in urban environments can be as acceptable as possible, it reduces the wind velocity and its vortices at the pedestrian to the comfort level for sitting and walking activities (>6 m / s).