﻿ 深海多立柱浮式平台涡激运动特性研究
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 力学学报  2016, Vol. 48 Issue (3): 593-598  DOI: 10.6052/0459-1879-15-446 0

引用本文 [复制中英文]

[复制中文]
Zhang Xinshu, Hu Xiaofeng, You Yunxiang, Fu Huiping, Duan Jinlong. INVESTIGATION ON THE CHARACTERISITICS OF VORTEX INDUCED MOTION OF A DEEP SEA MUTI-COLUMN FLOATING PLATFORM[J]. Chinese Journal of Theoretical and Applied Mechanics, 2016, 48(3): 593-598. DOI: 10.6052/0459-1879-15-446.
[复制英文]

文章历史

2015-12-13 收稿
2016-02-23 录用
2016-03-04 网络版发表.

1. 高新船舶与深海开发装备协同创新中心, 上海 200240;
2. 上海交通大学海洋工程国家重点实验室, 上海 200240

1 数值模型 1.1 改进的延迟脱体涡方法(IDDES)

 $\tilde{d}=\min (d,{{C}_{\text{des}}}\Delta )$ (1)

 $\tilde{d}={{\tilde{f}}_{\text{d}}}\left( 1+{{f}_{\text{e}}} \right)d+\left( 1-{{{\tilde{f}}}_{\text{d}}} \right)\psi {{C}_{\text{des}}}\text{ }{{\Delta }_{1}}$ (2)

2 网格划分与边界条件研究

 图1 计算域及网格划分 Fig.1 Computational domain and mesh

 图2 流向角以及等效水平刚度示意图 (俯视图) Fig.2 Definition of current heading and equivalent horizontal mooring stiffness

3 计算结果 3.1 多立柱浮式平台自由衰减数值模拟

3.2 涡激运动响应模拟

 $A/D=\sqrt{2}{{\delta }_{1}}/D,\phi =\sqrt{2}{{\delta }_{2}}$ (3)
 ${{V}_{r2}}=U\cdot {{T}_{n2}}/D,{{V}_{r6}}=U\cdot {{T}_{n6}}/D$ (4)

 图3 涡激运动响应 Fig.3 Nominal VIM responses

3.3 涡激运动特性分析

 图4 涡激运动频率比 Fig.4 Frequency ratio

 图5 横向运动的功率谱密度 Fig.5 Power spectrum density of motion in the transverse direction

 图6 艏摇的功率谱密度 Fig.6 Power spectrum density of yaw motion
3.4 涡激运动中平台底部的流场特性

 图7 立柱中纵剖面上的压力分布图和速度矢量 Fig.7 Pressure contour and velocity vector in the middle section of a column of a TLP
4 结论

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INVESTIGATION ON THE CHARACTERISITICS OF VORTEX INDUCED MOTION OF A DEEP SEA MUTI-COLUMN FLOATING PLATFORM
Zhang Xinshu, Hu Xiaofeng, You Yunxiang, Fu Huiping, Duan Jinlong
1. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China;
2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract: Based on the impressible Navier-Stokes equation, the characteristics of the vortex induced motion (VIM) for a multi-column floating platform are investigated by employing an improved delayed detached eddy simulation method (IDDES). Mesh parameters and boundary condition developed in the numerical method are extensively studied. The transverse and yaw motion responses of a Tension Leg Platform (TLP) with four columns are computed in three current headings including 0°, 22.5°and 45°, for di erent reduced velocities. In addition, the behavior of vortex induced motion response, the frequency ratio and the displacement power spectral density are computed and systematically analyzed. The numerical results show that the present predictions of VIM agree well with those from experiments. The lock-in frequency occurs in the transverse reduced velocities ranging from 7.0 to 14.0 and the transverse motion amplitudes vary between 0.2D and 0.4D (where D denotes the width of the column). The yaw motion amplitudes increase with the reduced velocities, which may be related with galloping. It is also found that the transverse motion frequency is the same as the yaw response frequency as the excited yaw moment is governed by the lift force acting on the vertical columns. The frequencies of motion in 22.5° and 45° incidences are higher than that in 0° . However, the yaw motion energy in 22.5° and 45° are around 10% of that in 0 incidences. Further, the three-dimensional fluid pattern is analyzed in the process of VIM for a multi-column floating platform.
Key words: multi-column floating platform    vortex induced motion    improved delayed detached eddy simulation method