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A Global Stability Analysis of the Wake behind a Rotating Circular Cylinder |
| MA Dong-Jun;SUN De-Jun;YIN Xie-Yuan |
| School of Engineering Science, University of Science and Technology of China, Hefei 230027 |
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| Cite this article: |
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MA Dong-Jun, SUN De-Jun, YIN Xie-Yuan 2005 Chin. Phys. Lett. 22 1964-1967 |
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Abstract A new high resolution approach based on spectral element method is proposed to analyse the complex global stability for the non-parallel flow passing a rotating and translating circular cylinder. The studies presented here predict the variation of Strouhal number St as the spin parameter α increases from 0.0 to 1.4, for the Reynolds number Re=60. The direct numerical simulation shows a small increase of vortex shedding frequency at α<1.1, and a slight decrease as α approaches the critical spin parameter α=1.37. The trend of variation of eigen-frequency with α obtained by linear stability analysis is opposite to those obtained by direct numerical simulation for Re=60, although they achieve the same frequency at the onset of vortex shedding.
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| Keywords:
47.15.Fe
47.20.Gv
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Published: 01 August 2005
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| PACS: |
47.15.Fe
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(Stability of laminar flows)
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47.20.Gv
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(Viscous and viscoelastic instabilities)
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