NUMERICAL INVESTIGATION ON FLOW-INDUCED VIBRATION OF TWO CYLINDERS IN TANDEM ARRANGEMENTS AND ITS COUPLING MECHANISMS

Ji Chunning; Chen Weilin; Huang Jilu; Xu Wanhai

doi:10.6052/0459-1879-14-118

Volume 46 Issue 6

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Article Navigation > Chinese Journal of Theoretical and Applied Mechanics > 2014 > 46(6): 862-870

Ji Chunning, Chen Weilin, Huang Jilu, Xu Wanhai. NUMERICAL INVESTIGATION ON FLOW-INDUCED VIBRATION OF TWO CYLINDERS IN TANDEM ARRANGEMENTS AND ITS COUPLING MECHANISMS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2014, 46(6): 862-870. doi: 10.6052/0459-1879-14-118

Citation:

Ji Chunning, Chen Weilin, Huang Jilu, Xu Wanhai. NUMERICAL INVESTIGATION ON FLOW-INDUCED VIBRATION OF TWO CYLINDERS IN TANDEM ARRANGEMENTS AND ITS COUPLING MECHANISMS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2014, 46(6): 862-870. doi: 10.6052/0459-1879-14-118

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NUMERICAL INVESTIGATION ON FLOW-INDUCED VIBRATION OF TWO CYLINDERS IN TANDEM ARRANGEMENTS AND ITS COUPLING MECHANISMS

doi: 10.6052/0459-1879-14-118

State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China

Funds: The project was supported by the National Natural Science Foundation of China (51321065, 50809047, 51209162, 51479135) and Natural Science Foundation of Tianjin (12JCQNJC02600).

Received Date: 2014-04-28
Rev Recd Date: 2014-07-07
Publish Date: 2014-11-18

Abstract

Abstract

Flow-induced vibration of two circular cylinders arranged in tandem at Re=100 is numerically investigated. The mass ratio of the cylinders is 2.0 and the center to center spacing ratio of the cylinders varies from 2.0 to 5.0. Two scenarios are considered: (a) the downstream cylinder is allowed to vibrate freely in the cross-flow direction while the upstream is fixed; (b) both cylinders are allowed to vibrate freely in the cross-flow direction. Results show that no matter the upstream cylinder is fixed or not, the transverse vibration amplitude of the downstream cylinder is obviously larger than an isolated one. For Scenario (a), the transverse amplitude of the downstream cylinder is larger than that of Scenario (b), which can be attributed to the fact below. When both cylinders vibrate freely, a significant "mutual-adjusting" happens between the wake of the upstream cylinder and the vibration of the downstream one, which intensifies the interaction between the two cylinders. We also investigated the coupling mechanisms of the downstream cylinder vibration and the gap flow of Scenario (b) and found that the vibration amplitude of the downstream cylinder attains its maximum when the reattached shear layer from the upstream cylinder can completely pass through the gap.
- flow-induced vibration,
- two cylinders in tandem arrangement,
- coupling mechanisms

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References(45)

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