Numerical Simulation on Flow around Analogous Square Cylinders at
Low Reynolds Number
DU Xiaoqing1,2，LIU Yantai1，SHI Dingjun1，MA Wenyong3
(1. Department of Civil Engineering, Shanghai University, Shanghai 200444, China;
2. Wind Engineering and Aerodynamic Flow Control Research Center, Shanghai University, Shanghai 200444, China;
3. Wind Engineering Research Center, Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, China)
Abstract：In order to improve the aerodynamic performance of the standard square cylinder with sharp corners and straight edges, taking analogous square cylinder modified by the shape of angle (sharp angle, fillet) and edge (straight edge, concave edge and convex edge) as research objects, the aerodynamic performance and flow field characteristics of six kinds of two-dimensional cylinders with different wind direction angles were studied under low Reynolds number by using unsteady numerical simulation method. Research results show that the modification of the angle and edge shape of the standard square cylinder can obviously change the flow field structure and improve or degrade its aerodynamic performance. Compared with the straight edge cylinder, the aerodynamic coefficient and the wind pressure coefficient of the convex edge cylinder decrease obviously, while those of the concave edge cylinder intend to increase. Compared with the sharp corner cylinder, the aerodynamic coefficient of the rounded cylinder shows a trend to decrease in all wind direction angles, and the Strouhal number increases. On the whole, among the six types of cylinder studied, the aerodynamic performance of the convex edge cylinder with rounded corners is the best, and that of the concave edge cylinder with sharp corners is the worst.
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2020, Vol. 39 
