Numerical Study on Flow around Four Square-Arranged Cylinders at Low Reynolds Numbers
Numerical Study on Flow around Four Square-Arranged Cylinders at Low Reynolds Numbers
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DOI：
10.1155/2017/6381256
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发表时间：
2017
影响因子：
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通讯作者：
Yangyang Gao;C. Yin;Haoyuan Zhang;Kang Yang;Xi-zeng Zhao;Zhi-jian Sun
中科院分区：
文献类型：
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作者：
Yangyang Gao;C. Yin;Haoyuan Zhang;Kang Yang;Xi-zeng Zhao;Zhi-jian Sun
本文对四个方形排列的圆柱在不同间距比(；为中心距；为圆柱直径)和不同雷诺数下的绕流进行了数值模拟。研究了间距比和雷诺数对尾迹流动特性的影响，如瞬时涡量分布、力系数和旋涡脱落频率。结果表明，间距比和雷诺数对四缸壳体后的流动特性有较大影响。在相同的间距比下，随着雷诺数的增加，流型的转变加快，力系数值相应波动较大，旋涡脱落频率随雷诺数的增大而显著增加。
In this paper, numerical simulations of flow past four square-arranged cylinders are carried out at different spacing ratios ( ; is the center to center distance; is the cylinder diameter) and Reynolds numbers . The effects of spacing ratio and Reynolds number on the wake flow characteristics are investigated, such as the instantaneous vorticity contours, force coefficients, and vortex shedding frequencies. The results show that the flow characteristics behind the four-cylinder cases are significantly affected by the spacing ratios and Reynolds numbers. At the same spacing ratio, the transformation of flow pattern is advanced quickly with increasing of Reynolds numbers, the values of force coefficients are correspondingly fluctuated with large amplitude, and the vortex shedding frequency is increased significantly with .