Three-dimensional transition in the wake of two tandem rotating cylinders

被引:6
作者
Behara, Suresh [1 ,4 ]
Chandra, Venu [2 ]
Prashanth, N. R. [3 ]
机构
[1] Aditya Inst Technol & Management, Dept Mech Engn, Tekkali 532201, AP, India
[2] Indian Inst Technol Madras, Dept Civil Engn, Chennai 600036, Tamil Nadu, India
[3] ESI Software India Pvt Ltd, 27th Cross,Banashankari 2nd Stage, Bangalore 560070, Karnataka, India
[4] GE Res, John F Welch Technol Ctr, Bangalore 560066, Karnataka, India
关键词
vortex dynamics; vortex instability; vortex interactions; CIRCULAR-CYLINDERS; FLOW INTERFERENCE; DYNAMICS;
D O I
10.1017/jfm.2022.861
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Three-dimensional (3-D) transition in the wake of two tandem co-rotating cylinders is studied numerically for Reynolds numbers 180 <= Re <= 500. Infinite cylinders of equal diameter (D) and span (8D) are placed at streamwise gaps Lx = 2.5D and 7.5D, and rotated at rotation rates alpha = 0, 0.5, 1 and 2. For alpha = 0 and Lx = 7.5D, 3-D transition in the wake of the upstream cylinder resembles that for an isolated cylinder with the formation of Mode-A and Mode-B instabilities, whereas for the downstream cylinder, only Mode-A instability occurs in both the Lx = 2.5D and 7.5D cases with alpha = 0. When the cylinders rotate at alpha = 1 for Lx = 7.5D, staggered transition takes place with the appearance of only Mode-B and only Mode-A instabilities in the near-wake regions of the upstream and downstream bodies, respectively. In the case Lx = 2.5D, the wake of the rotating cylinders transitions via Mode-C and Mode-D instabilities for alpha = 0.5, Mode-D and Mode-D' for alpha = 1, and Mode-C and Mode-A for alpha = 2. A sudden decrease in near-wake fluctuations, accompanied by a downward jump in the force coefficients, is observed as the 3-D instability shifts from one mode to another, for alpha >= 1 and Lx = 2.5D. This discontinuity is caused by the formation of a pair of opposite-signed recirculation zones that mitigate each other's effects in the near-wake region.
引用
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页数:32
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