摘要We present a study on the vortex structures and behavior of a flow past two rotating circular cylinders arranged side-by-side at a range of absolute rotational speeds (|α|≤2) for two different gap spacings g*=1.5 and 0.7 at Reynolds numbers Re=160 and 200. The results show that the flow becomes stabilized and finally steady beyond the critical rotational speed as |α| increases, regardless of the variation in Re and g*. The value of critical rotational speed increases with increasing Re. The wake patterns change in the unsteady regimes for g*=1.5 and 0.7. With increasing |α|, the time-averaged drag coefficient -CD decreases and the lift coefficient -CL increases, respectively. CD at Re=160 and g*=0.7 decreases rapidly, resulting in the smallest value at the same |α| for 1≤|α|≤2. -CD augments with increasing g* at the same |α|. For g*=1.5, -CD has a little disparity between the cases of Re=160 and 200. For the flow past two still cylinders, -CL is inversely proportional to g* of two cylinders for a fixed |α|, and is not dependent on Re.
Abstract：We present a study on the vortex structures and behavior of a flow past two rotating circular cylinders arranged side-by-side at a range of absolute rotational speeds (|α|≤2) for two different gap spacings g*=1.5 and 0.7 at Reynolds numbers Re=160 and 200. The results show that the flow becomes stabilized and finally steady beyond the critical rotational speed as |α| increases, regardless of the variation in Re and g*. The value of critical rotational speed increases with increasing Re. The wake patterns change in the unsteady regimes for g*=1.5 and 0.7. With increasing |α|, the time-averaged drag coefficient -CD decreases and the lift coefficient -CL increases, respectively. CD at Re=160 and g*=0.7 decreases rapidly, resulting in the smallest value at the same |α| for 1≤|α|≤2. -CD augments with increasing g* at the same |α|. For g*=1.5, -CD has a little disparity between the cases of Re=160 and 200. For the flow past two still cylinders, -CL is inversely proportional to g* of two cylinders for a fixed |α|, and is not dependent on Re.
GUO Xiao-Hui;LIN Jian-Zhong;NIE De-Ming. Vortex Structures and Behavior of a Flow Past Two Rotating Circular Cylinders Arranged Side-by-Side[J]. 中国物理快报, 2009, 26(8): 84701-084701.
GUO Xiao-Hui, LIN Jian-Zhong, NIE De-Ming. Vortex Structures and Behavior of a Flow Past Two Rotating Circular Cylinders Arranged Side-by-Side. Chin. Phys. Lett., 2009, 26(8): 84701-084701.
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