LES study of windward-face-mounted ribs&rsquo; effects on flow fields and aerodynamic forces on a square cylinder

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (18) : 225-232.

LES study of windward-face-mounted ribs’ effects on flow fields and aerodynamic forces on a square cylinder

JIANG Yuan1,2,LIU Jinyang2,LIU Rui1,HUI Yi2

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Abstract

Previous studies have demonstrated that the facade ribs could significantly reduce the wind load of high-rise building. However, the flow filed modification mechanism of these facade appurtenances has not been clarified. Therefore, in this study, large eddy simulations (LES) are carried out to investigate the impact of windward-face-mounted vertical ribs on flow filed and aerodynamic forces of square cylinder under smooth inflow. The flow structure, wind pressure distributions and aerodynamic forces of different models are analyzed to elaborate the flow filed mechanism of the vertical ribs. It is found that local recirculation are introduced in the front corner region owing to the presence of ribs, which obviously influences the flow separation and the behavior of shear layer. Rib depth d significantly affect the flow structure, vortex-shedding frequency and wind pressure distribution. The changes in the flow field result in remarkable mitigation of mean drag C ̅_d and fluctuating lift C’l. There are optimal combination value of rib position parameters b and extension depth d, the aerodynamic forces is smallest in these cases. The maximum reduction ratios of C ̅_d and C’l reach 50% and 86%, respectively, when d/D=0.12 and b/D=0.10.

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Aerodynamic modification / Square cylinder / Vertical ribs / LES / Flow Field / Aerodynamic forces;

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JIANG Yuan1,2,LIU Jinyang2,LIU Rui1,HUI Yi2. LES study of windward-face-mounted ribs’ effects on flow fields and aerodynamic forces on a square cylinder[J]. Journal of Vibration and Shock, 2023, 42(18): 225-232

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