Numerical simulation of aerodynamic characteristics of crescent thin iced conductor
LIN Wei1,2, XIAO Zhibin1,2, LOU Wenjuan3, HUANG Mingfeng2,3, ZHANG Yuelong3
1. Architectural Design and Research Institute Co., Ltd., Zhejiang University, Hangzhou 310027, China;
2. Research Center for Balance Architecture, Zhejiang University, Hangzhou 310027, China;
3. Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China
Abstract：The flow around a circular cylinder in subcritical state is calculated by CFD numerical simulation method. The results of average wind pressure, average wind speed, fluctuating wind speed, stolawha number (St), etc. under different calculation conditions are compared with the experimental results. The influence of near wall mesh and spanwise length on the results is studied, and the calculation results of LES and k- SST turbulence model are compared. With that, Two and three dimensional calculation models are established respectively for iced conductors, and the aerodynamic three-component coefficients of crescent thin iced single conductor are calculated and compared with the experimental results. The phenomenon of sharp peaks and jumps of aerodynamic parameters with the change of angle of attack is analyzed based on the distribution characteristics of wind pressure on the surface of iced conductors. The results show that there are significant differences between two-dimensional and three-dimensional iced conductor models. In order to obtain accurate numerical solutions, it is necessary to use a three-dimensional calculation model, and 3 times of conductor diameter for spanwise length should be considered to obtain much better accuracy of the results.
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