2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference

Flow-Conditioning of the Wind Tunnel at Ryerson University to Model Boundary Layer Flows

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Mr. Tarek Ghazal, Ryerson University (Presenter)
Mr. Jiaxiang Chen, Ryerson University
Mr. Moustafa Aboutabikh, Ryerson University
Dr. Haitham Aboshosha, Ryerson University

This study aims at modeling boundary layers (BLs) encountered by tall buildings (i.e. open, suburban and urban) at the subsonic Wind Tunnel (WT) at Ryerson University (RU). This WT has an insignificant turbulence intensity and requires a flow-conditioning system consisting of turbulence generating elements (i.e spires, roughness blocks, barriers) to achieve proper turbulent characteristics. This system was developed in the current study in two phases. In phase I, several Computational Fluid Dynamic (CFD) simulations of the tunnel with generating elements were conducted to understand the effect of each element on the flow. This led to a preliminary design of the system, in which horizontal barriers (slats) are added to the spires to introduce turbulence at higher levels of the tunnel. This design was revisited in phase II, to specify slat dimensions leading to target BLs encountered by tall buildings. It was found that rougher BLs require deeper slats and, therefore, two-layer slats (one fixed and one movable) were implemented to provide the required range of slat depth to model most BLs. Moreover, this system was implemented and validated experimentally at RU wind tunnel and was able to generate different BLs for various terrains. It only involves slat movement to change the BL, which is very useful for automatic wind tunnel testing of tall buildings at RU wind tunnel.