RESEARCH ON THE FLOW FIELD AND AERODYNAMIC CHARACTERISTICS BETWEEN DIFFERENT WIDTH RATIOS OF TANDEM SQUARE CYLINDERS
This paper studies the wind pressure characteristics and flow field mechanism of tandem square columns due to flow interference,in which the flow field and aerodynamic forces on the principal building in different width ratios are studies by large eddy simulation method. The aerodynamic coefficients,average wind pressure coefficients,and flow field distribution characteristics of different models at a Reynolds number of 22000 and a spacing ratio of 2.5 are analyzed. The results indicate that the average drag directions of the two square cylinders are opposite,and the fluctuating drag coefficients show a pattern of first decreasing,then increasing,decreasing,and increasing again. Both the windward and leeward sides exhibit wind suction,while some areas on the lateral surface show wind pres-sure. The maximum value of the average wind pressure coefficient increases with the increase of the width ratio. The width of the shear layer of the upstream column gradually increases with the increase of width ratios. In the study of the interference effect under five different width ratios,the shielding effect is the most significant when the width ra-tio is 1.4.