| Project/Area Number |
26630459
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Naval and maritime engineering
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| Research Institution | Kyushu University |
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Principal Investigator |
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| Research Collaborator |
Meng Shuai 上海交通大学, 助教
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2016: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2015: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
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| Keywords | 渦励振 / 内部流体 / クロスフロー方向VIV / インライン方向VIV / クロスフロー方向 / インライン方向 / ウェイク振動子 / 連成運動 / 臨界速度 / internal flow effect / vortex-induced vibration / cantileverd pipe / cross-flow motion / inline motion / rock-in region / van der Pol oscilator / mass ratio / Cantilevered Pipe / Vortex-Induced Vibration / Flow-Induced Vibration / Inline flow / cross flow / lock-in region. / CCS |
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| Outline of Final Research Achievements |
This study devotes efforts to investigate the IFE (Internal Flow Effect) on the CF (Cross-Flow) VIV (Vortex-Induced Vibration) of a cantilevered pipe discharging fluid. In this study, a simple fluid-structure interaction model is proposed which employs a linear structural equation to describe the transverse vibrations and utilizes a distributed wake oscillator to create the VIV effect. The simulations are justified by comparing with experiments for VIV effect and the non-conservative IFE of flexible risers. Then simulations of a flexible riser are performed by varying incoming currents and internal flow rates. The IFE on VIVs are examined by the space-time modifications of riser responses and dominant vibration frequency for which the mode switching and sharing can be identified. When the internal flow velocity is small, the pipe is losing energy to the inner flow and the VIVs can be depressed significantly.
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