串列双圆柱流致振动的数值模拟及其耦合机制

及春宁; 陈威霖; 黄继露; 徐万海

doi:10.6052/0459-1879-14-118

串列双圆柱流致振动的数值模拟及其耦合机制

doi: 10.6052/0459-1879-14-118

天津大学水利工程仿真与安全国家重点实验室, 天津 300072

基金项目: 国家自然科学基金(51321065,50809047,51209162,51479135)和天津市青年科学基金(12JCQNJC02600)资助项目.

详细信息

作者简介:
徐万海,副教授,主要研究方向:海洋工程,涡激振动,非线性动力学.

中图分类号: P751;TB531
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- 被引次数: 0
出版历程
- 收稿日期: 2014-04-28
- 修回日期: 2014-07-07
- 刊出日期: 2014-11-18

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

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).

摘要

摘要: 对雷诺数Re= 100 条件下串列双圆柱的流致振动进行了数值模拟. 圆柱的质量比m^*均为2.0,间距比L/D 为2.0 5.0. 考虑两种工况:(a) 上游圆柱固定,下游圆柱可沿横流向自由振动;(b) 上、下游圆柱均可沿横流向自由振动. 结果表明:无论上游圆柱静止或者振动,下游圆柱横向振幅明显大于单圆柱的. 工况(b) 的下游圆柱最大振幅要大于工况(a) 的,这是由于两圆柱均振动时,两圆柱之间耦合作用增强,上游圆柱的尾流和下游圆柱的振动之间“相互调节” 作用显著. 对工况(b) 的下游圆柱振动和间隙流之间的作用机制进行了详细的研究,发现当上游圆柱脱落的自由剪切层重新附着于下游圆柱上并且完全从间隙之间通过时,下游圆柱的振幅最大.
- 流致振动 /
- 串列双圆柱 /
- 耦合机制
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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