高阻尼高雷诺数下串列双圆柱尾流激振数值研究

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李小超,罗旋,徐伟,黄筱云,陈龙.高阻尼高雷诺数下串列双圆柱尾流激振数值研究[J].,2020,60(1):46-52

高阻尼高雷诺数下串列双圆柱尾流激振数值研究

Numerical investigation on high damping, high Reynolds numbers wake-induced vibrations of cylinders in tandem arrangement

DOI：10.7511/dllgxb202001007

中文关键词:涡激振动驰振尾流结构高阻尼高雷诺数

英文关键词:vortex-induced vibration galloping wake structure high damping high Reynolds numbers

基金项目:湖南省自然科学基金资助项目(2018JJ2435)；湖南省教育厅科学研究项目(19B014)；国家自然科学基金资助项目(513090385167901551809022).

作者	单位
李小超,罗旋,徐伟,黄筱云,陈龙

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中文摘要:

流激振动水流动能转换装置多柱体阵列涉及复杂的尾流激振问题，其运行时柱体振动具有高阻尼、高雷诺数特征．基于雷诺平均Navier-Stokes方程，结合SSTk-ω湍流模型和任意拉格朗日-欧拉流固耦合动网格控制方法建立串列双圆柱尾流激振数值模型，重点考察小间距比(两圆柱中心距离与圆柱外径之比)、高阻尼、高雷诺数条件下串列双圆柱的尾流激振特性．计算时间距比分别为1.5、2、3、4、20，振动圆柱阻尼比为0.12，雷诺数范围为17 000~98 000．结果表明，不同间距条件下下游圆柱振动表现为驰振、分离的涡激振动-驰振、涡激振动等不同的振动特性，振动特性的不同与上游圆柱后面的尾流形态及其剪切层重附于下游圆柱的方式密切相关，间距比为1.5、2时上游圆柱分离出来的剪切层交互式地重附于下游圆柱，使下游圆柱振动表现为驰振；间距比为3、4时下游圆柱振动表现为分离的涡激振动-驰振振动形式，此振动形式的出现与恒定式的剪切层重附方式或剪切层未发生卷曲有关．

英文摘要:

The flow-induced vibrations (FIVs) based hydrokinetic energy converter consists of cylinder array. High Reynolds numbers and high damping are required to operate the cylinders of the energy converter. Wake-induced vibration is a complex flow-structure interaction problem which is concerned in flow-induced vibrations of cylinders. An extensive study of wake-induced vibrations of two closely spaced circular cylinders in tandem arrangement at high Reynolds numbers and high damping conditions is presented using a computational fluid dynamics approach. The fluid flow is modeled using Reynolds-averaged Navier-Stokes equations in conjunction with the SST k-ω turbulence model. An arbitrary Lagrange-Euler (ALE) fluid-field model is used to simulate the fluid-structure interactions. Five spacing ratios are examined, i.e., S/D=1.5, 2, 3, 4 and 20 (S is the gap spacing between the centers of the two cylinders; Dis the diameter of cylinder). The damping ratio is kept a constant of 0.12, and the Reynolds number is from 17 000 to 98 000. Depending on the cylinders′ separation, the cylinder exhibits a galloping, or a separated vortex-resonance and galloping, or a vortex-resonance. It is found that the wake pattern of the upstream cylinder and the reattachment of shear layers that separate from the upstream cylinder have strong influence in changing vortex shedding behind the downstream one, and then affects the vibration characteristics of the downstream one. For S/D=1.5 and 2, the shear layers reattach alternately to the surface of the downstream cylinder and the downstream cylinder shows a galloping response; for S/D=3 or 4, the downstream cylinder exhibits a separated vortex-resonance and galloping due to the steady reattachment of the shear layers or no roll-up shear layer.

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