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《Journal of Shanghai Jiaotong University》 2012-01
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Numerical Analysis of Flow Past Two Bluff Bodies with Square-Section in Tandem Arrangement

WU Qi-er,ZHOU Dai,FU Gong-yi(School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiaotong University,Shanghai 200240,China)  
The flow past two tandem square-section bluff bodies with various spacing ratios was investigated numerically by using a second-order CBS finite element algorithm.The study mainly focuses on the effect of spacing ratios(ratio of center-to-center distance to width of bluff body) on the flow characteristics at a Reynolds number of 100.The mean drag coefficient and the root-mean-square drag and lift coefficients,the Strouhal number as well as the pressure coefficient are plotted as a function of the spacing ratio.The results reveal that spacing ratio has a great impact on the flow characteristics and the critical spacing ratio range is identified between 4.50 and 4.75,since the mean and root-mean-square force coefficients jump suddenly in this spacing ratio interval.When two bluff bodies with square-section are placed in tandem,the mean drag coefficient can be reduced effectively.The results also show that the root-mean-square lift coefficient of the downstream bluff body is always greater than that of upstream bluff body due to the wake interference.A significant difference of surface pressure coefficient distribution can also be observed.
【Fund】: 国家自然科学基金项目(51078230 11172174);; 上海市基础研究重点项目(10JC1407900)
【CateGory Index】: TB126
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