| A Forced System of Two Cylinders with Various Spacings |
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| 作者姓名： | 邹建锋 任安禄 邓见 |
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| 作者单位： | DepartmentofMechanics,ZhejiangUniversity,Hangzhou310027,China |
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| 基金项目： | TheresearchprojectwassupportedbytheNationalNaturalScienceFoundationofChina (GrantNo .1 0 2 72 0 94) |
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| 摘 要： | The spectrum characteristics and wake structures for a circular cylinder oscillating in a wake are investigated by use of the currently modified virtual boundary method. A forced system of two cylinders with a small spacing ( the downstream one is made to oscillate in the transverse direction) is studied and interesting flow characteristics are observed. A vortex switch and the change of vortex modes (between 2S mode and 2P mode) are observed in the “lock-in“ region. Vortex bands are formed and lost with the increasing excitation frequency. Information concerning saddle points in the flow field is obtained for different excitation frequencies. For a forced system of two cylinders with a large spacing, the upstream cylinder sheds vortexes because there is no downstream cylinder oscillating in the wake. No distinct “lock-in“ response is found for the downstream cylinder.
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| 关 键 词： | 光谱特征 振荡 分界线 水深 |
A Forced System of Two Cylinders with Various Spacings |
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| ZOU Jian feng ,REN An lu and DENG Jian.A Forced System of Two Cylinders with Various Spacings[J].China Ocean Engineering,2004,18(3):391-402. |
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| Authors: | ZOU Jian feng REN An lu and DENG Jian |
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| Affiliation: | ZOU Jian feng 1,REN An lu and DENG Jian Department of Mechanics,Zhejiang University,Hangzhou 310027,China |
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| Abstract: | |
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| Keywords: | virtual boundary method oscillating cylinder wake structure spectra |
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