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《Journal of Southwest Jiaotong University》 2018-03
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Numerical Study of Flow Characteristics Around Square Cylinder at High Reynolds Number

ZHOU Qiang;LIAO Haili;CAO Shuyang;Key Laboratory of Wind Engineering of Sichuan Province,Southwest Jiaotong University;State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University;  
Three-dimensional large eddy simulations( LES) were performed at high Reynolds numbers( Re = 22 000) and using the dynamic Smagorinsky sub-grid model to investigate uniform flow over a square cylinder. Meshing of the model was performed using Open Foam-an open-source computational tool. Mean integral quantities were compared against existing experimental and numerical results to validate the proposed numerical method. Subsequently,the flow structure around and aerodynamic forces acting on the cylinder were analysed to perform an in-depth investigation of mean-and turbulentflow characteristics. Lastly,the influence of the grid system around the cylinder and span-wise length on the flow structure and spatial correlation were investigated via comparison between different cases.Results demonstrate that the recirculation length in the wake approximately measured 1. 37 D( width of square),while the Strouhal number and RMS value of the lift coefficient are 0. 121 and 1. 40,respectively. In addition,domain length along the span-wise should be equal to 8 D in order to obtain clear turbulent-flow characteristics.
【Fund】: 国家自然科学基金资助项目(51378442 51708462);; 中央高校基本科研业务费专项资金资助项目(2682016CX006)
【CateGory Index】: O357.5
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