不同间隙比和边界层厚度下的近壁面弹性圆柱涡激振动特性

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摘要采用嵌入式迭代浸入边界法对不同间隙比和边界层厚度下的近壁面弹性圆柱涡激振动进行了三维直接数值模拟研究。间隙比G/D=0.6和1.0，边界层厚度δ/D=0.0、0.7和1.6，雷诺数Re=350，质量比m*=6，圆柱长细比L/D=25。分析了流场旋涡分布、圆柱振动振幅、振动频率、振动同步性与振动轨迹随间隙比和边界层厚度的变化情况。结果发现，泄涡具有较强的三维性，跨中部分泄涡强，尾涡宽度大；振动幅值与圆柱和边界层之间的相对位置密切相关；顺流向和横流向振动均呈现一阶振型，且频率相同，振动轨迹呈现水滴形或椭圆形；随着近壁圆柱逐渐没入边界层中，圆柱顺流向和横流向振动相位差逐渐增大。
关键词：近壁面；涡激振动；边界层；间隙比

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	刘旭菲1
	花阳2
	3
	卫昱含3
	及春宁3

关键词 ：近壁面, 涡激振动, 边界层, 间隙比

Abstract：Three-dimensional direct numerical simulation on the vortex-induced vibrations of a flexible near-wall circular cylinder at different gap ratio and boundary layer thickness is carried out by using the embedded iterative immersed boundary method. The gap ratio is G/D=0.6 and 1.0, the boundary layer is δ/D=0.0, 0.7 and 1.6, the Reynolds number is Re=350, the mass ratio is m*=6, and the aspect ratio is L/D=25. The vortex-shedding patterns, in-line and transverse vibration amplitude, the vibration frequency, the vibration synchronization and the XY-trajectory are investigated with different gap ratio and boundary layer thickness. The results show that the vortex shedding has obvious three-dimensionality with stronger vortices and a wider wake width in the midspan. The vibration amplitudes show a close relationship with the relative position of the cylinder in the boundary layer. The in-line and transverse vibrations show the first order mode of vibration at the same frequency. The XY-trajectory presents a drop-like shape or an elliptical shape, while with the cylinder being immersed in the boundary layer, the phase difference between the in-line and transverse vibrations of the cylinder increases.
Key words: Near wall; Vortex-induced vibration; Boundary layer; Gap ratio

Key words： Near wall Vortex-induced vibration Boundary layer Gap ratio

收稿日期: 2021-05-25 出版日期: 2022-11-15

引用本文:

刘旭菲1，花阳2，3，卫昱含3，及春宁3. 不同间隙比和边界层厚度下的近壁面弹性圆柱涡激振动特性[J]. 振动与冲击, 2022, 41(21): 35-44.
LIU Xufei1, HUA Yang2,3, WEI Yuhan3, JI Chunning3. VIV characteristics of an elastic cylinder near wall under different gap ratios and boundary layer thicknesses. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(21): 35-44.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I21/35

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