An insight into the wake evolution of power-law flow past three tandem circular cylinders

被引:0
|
作者
Zhu, Hongjun [1 ]
Xie, Yipu [1 ]
Li, Yingmei [1 ]
Zhong, Jiawen [1 ]
Zhou, Tongming [2 ]
机构
[1] Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Peoples R China
[2] Univ Western Australia, Dept Civil Environm & Min Engn, Washington 6009, Australia
基金
中国国家自然科学基金;
关键词
SHEAR-THINNING FLUIDS; HEAT-TRANSFER; STEADY FLOW; PAIR;
D O I
10.1063/5.0219585
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
This paper reports the wake flow evolution of power-law flow past three tandem cylinders with identical diameter and spacing at a low incoming Reynolds number of Re = 80. The flow characteristics of power-law fluid with variable power-law index n are examined at spacing ratios of L/D = 3, 5, and 8 (where L is the spacing between the centers of two adjacent cylinders and D is the cylinder diameter). Three combined wake interference regimes are identified, including the overshoot-overshoot, overshoot-alternate reattachment, and alternate reattachment-quasi-co-shedding regimes, which are distinctly illustrated from the dynamic mode decomposition results. The quasi-co-shedding regime mainly occurs between the middle and downstream cylinders (denoted as C2 and C3, respectively) when L/D = 5 and L/D = 8. The switching of wake regime contributes to the sudden changes of hydrodynamic coefficients of the cylinders. Nevertheless, due to the shadowing effect, the drags of C2 and C3 remain to smaller than that of the upstream cylinder (denoted as C1).
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页数:13
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