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基于商业软件Fluent,建立大振幅海洋内孤立波数值水槽,获取内孤立波波致水平流速和水平加速度沿垂向的分布,结合改进的Morison公式,计算内孤立波对立管的作用,采用有限单元法在时域中对内孤立波作用下顶张力立管的动力响应进行数值模拟,并就顶张力大小、内流密度、内孤立波振幅对立管动力响应的影响进行探讨。结果表明,内孤立波对顶张力立管产生强剪切作用,使立管发生较大变形,产生较高应力,并在波谷到达时刻出现最大位移和应力,立管上层流体部分的位移和应力明显大于下层流体部分的位移和应力。
Based on the commercial software Fluent, a large-amplitude solitary wave numerical seawater was established to obtain the horizontal and vertical acceleration of the internal solitary waves. The Morison formula was used to calculate the effect of internal solitary waves on the risers. The finite element Method is used to simulate the dynamic response of top riser pipe under the action of internal solitary wave in the time domain. The influences of top tension, inner density, and internal solitary wave amplitude on the dynamic response of riser are discussed. The results show that the internal solitary wave has a strong shearing effect on the top tension riser, resulting in large deformation of the riser, resulting in higher stress and maximum displacement and stress at the trough arrival time. The displacement and stress of the riser upper fluid part Significantly greater than the underlying fluid displacement and stress.