Abst'/> Numerical investigation of the effect of plane boundary on two-degree-of-freedom of vortex-induced vibration of a circular cylinder in oscillatory flow
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Numerical investigation of the effect of plane boundary on two-degree-of-freedom of vortex-induced vibration of a circular cylinder in oscillatory flow

机译：平面边界对振荡流中圆柱体涡流两自由度振动影响的数值研究

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摘要

AbstractThe laying of subsea pipelines often produces situations where the pipeline is suspended above the seabed due to local erosion of sediment. In this paper, flow induced vibration of a circular cylinder close to a plane boundary in an oscillatory flow is studied through two-dimensional numerical simulations. The circular cylinder and the plane boundary represents a pipeline and the seabed, respectively. It is found that the plane boundary affects the vibration amplitude in the cross-flow direction significantly. The vibration in the vertical direction ceases if reduced velocity exceeds 6 forKC = 5 and 12 forKC = 10, respectively. The vibration in the cross-flow direction stops when the reduced velocity exceeds a critical value because the effectiveKCnumber and the effective reduced velocity, which are both based on the relative velocity of the cylinder to the fluid motion, are extremely small. ForKC = 10, the vortex shedding is found to be in one pair regime for most of the reduced velocities and non-vortex shedding regime exists at large reduced velocities. Because the shear layers generated from the plane boundary attract the vortices generated from the cylinder, vortex shedding occurs only at the bottom side of the cylinder.Highlights•VIV of a cylinder near a plane boundary is studied numerically.•The plane boundary does not affect the lock-in range of the reduced velocity.•The plane boundary has a significant influence on the vibration amplitude in the cross-flow direction.•The vibration in they-direction ceases after reduced velocity exceeds a critical value.•The vortex shedding only occur at the boundary side of the cylinder.
机译： 摘要 海底管道的铺设通常会导致由于沉积物局部侵蚀而使管道悬挂在海床上方的情况。本文通过二维数值模拟研究了在振荡流中靠近平面边界的圆柱体的流致振动。圆柱和平面边界分别代表管道和海底。发现平面边界显着影响横流方向上的振动幅度。如果 KC = 5的降低速度分别超过6和 KC = 10的降低速度分别超过12，则垂直方向的振动将停止。当降低的速度超过临界值时，横流方向的振动将停止，因为有效 KC 数和有效降低的速度均基于圆柱体的相对速度对于流体运动，都非常小。对于 KC = 10，对于大多数降低的速度，发现涡旋脱落处于一对状态，而在降低的速度较大时则存在非涡旋脱落。因为从平面边界产生的剪切层吸引了圆柱体产生的涡流，所以涡流脱落仅发生在圆柱体的底面。 突出显示 • 对位于平面边界附近的圆柱的VIV进行了数值研究。 • 平面边界不会影响锁定范围 • 计划边界对错流方向上的振动幅度有显着影响。 •< / ce：label> 在降低的速度超过临界值后， y 方向的振动停止。 • 涡旋脱落仅发生在圆柱体的边界侧。 < / ce：抽象>

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  • 来源
    《Ocean Engineering》 |2018年第15期|17-32|共16页
  • 作者

    Adnan Munir; Ming Zhao; Helen Wu; Dezhi Ning; Lin Lu;

  • 作者单位

    School of Computing, Engineering and Mathematics, Western Sydney University Locked Bag 1797;

    School of Computing, Engineering and Mathematics, Western Sydney University Locked Bag 1797,State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology;

    School of Computing, Engineering and Mathematics, Western Sydney University Locked Bag 1797;

    State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology;

    State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Vortex shedding; VIV; Circular cylinder; Plane boundary; Oscillatory flow;

    机译：涡旋脱落VIV圆柱平面边界振荡流动;

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