| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Vortex Structures and Behavior of a Flow Past Two Rotating Circular Cylinders Arranged Side-by-Side |
| GUO Xiao-Hui1, LIN Jian-Zhong1,2, NIE De-Ming1 |
| 1Institute of Fluid Mechanics, China Jiliang University, Hangzhou 3100182Department of Mechanics, Zhejiang University, Hangzhou 310027 |
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| Cite this article: |
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GUO Xiao-Hui, LIN Jian-Zhong, NIE De-Ming 2009 Chin. Phys. Lett. 26 084701 |
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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.
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| Keywords:
47.32.Cd
47.11.Qr
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Received: 19 April 2009
Published: 30 July 2009
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