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| Flow-induced vibrations of three side-by-side cylinders in laminar flow: vibration response and near-wake patterns |
| Received:May 22, 2017 Revised:September 15, 2017 |
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| DOI：10.7511/jslx20170522001 |
| KeyWord:three side-by-side cylinders vortex-induced vibration wake patterns vibration response laminar flow |
| Author | Institution |
| 徐晓黎 |
天津大学 建筑工程学院 水利工程仿真与安全国家重点实验室, 天津 |
| 及春宁 |
天津大学 建筑工程学院 水利工程仿真与安全国家重点实验室, 天津 |
| 张力 |
天津大学 建筑工程学院 水利工程仿真与安全国家重点实验室, 天津 |
| 陈威霖 |
天津大学 建筑工程学院 水利工程仿真与安全国家重点实验室, 天津 |
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| Abstract: |
| Flow-induced vibrations (FIVs) of three side-by-side cylinders are numerically investigated using a highly accurate immersed boundary method (IBM) utilizing the built-in pressure-force iterations.The Reynolds nubmer is Re=100.The center-to-center spacing ratio T/D is set as 2.0,2.5,3.0,4.0,5.0,respectively.The mass ratio is m*=2.0 and the reduced velocity is in the range of Ur=2.0~10.0,the damping ratio is zero.The vibration of the cylinders is allowed only in the cross-flow direction.It was found that the response of the cylinders experiences two vibration modes,i. e.the initial and the lower branches,with the increasing reduced velocity.A discontinuity is observed in the response.With the increase of spacing ratio,its corresponding reduced velocity increases.The near-wake patterns significantly depend on T/D and Ur.Six near-wake patterns are observed,i.e.,the narrow-wide-narrow pattern,the irregular pattern,the anti-phase-synchronized pattern,the modulated pattern,the in-phase-synchronized pattern and the biased gap-flow pattern.A partition map of the near-wake patterns in the parameter space[Ur,T/D] is given. |
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