Internal flow effect on vortex-induced vibration of three-dimensional mining lifting risers with improved wake oscillator model

IF 5.5 2区 工程技术 Q1 ENGINEERING, CIVIL
Zhiquan Zhou , Wentao Yue , Jiasong Wang
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引用次数: 0

Abstract

This paper presents an improved three-dimensional nonlinear model considering the axial derivative of varying tension (ADVT) and the dynamically updated relative velocity (DURV) to study the vortex-induced vibration (VIV) of mining lifting risers conveying uniform and slug flow. The model, consisting of structural dynamics and wake oscillator equations, is solved by central difference method. This model offers an enhanced precision of VIV prediction by comparing with the existing experimental and other numerical models. The results reveal that the internal flow effect (IFE) is more significant in the in-line direction. Increase of the internal flow parameters will trigger new cycle of the vibration frequency and alter displacement and dominant mode order of the structure. Besides, the ADVT can change the dominant mode order and vibration frequency, impacting the reliability of displacement. It also reverses the asymmetrical distribution of displacement. The DURV reduces the vibration frequency, improves the VIV prediction sensitivity of internal flow conditions and changes the VIV pattern in both directions. These two factors exhibit similar effects in uniform and slug flow and have more pronounced effect on the latter. The effect is more obvious when these two factors couple or the value of the internal parameters are larger.
基于改进尾迹振荡模型的三维矿山提升立管内部流动对涡激振动的影响
本文提出了一种考虑变张力轴向导数和动态更新相对速度的改进三维非线性模型,用于研究输送均匀段塞流的矿山提升立管涡激振动问题。该模型由结构动力学方程和尾流振子方程组成,采用中心差分法求解。与已有的实验模型和其他数值模型相比,该模型提高了涡激振动预报的精度。结果表明,内部流动效应(IFE)在直线方向更为显著。内部流动参数的增加会引发振动频率的新周期,改变结构的位移和主模态阶数。此外,ADVT会改变主模态阶数和振动频率,影响位移的可靠性。它还扭转了位移的不对称分布。DURV降低了振动频率,提高了内部流动条件的涡激振动预测灵敏度,并在两个方向上改变了涡激振动型。这两个因素对均匀流和段塞流的影响相似,对段塞流的影响更为显著。当这两个因素耦合或内部参数值较大时,其影响更为明显。
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来源期刊
Ocean Engineering
Ocean Engineering 工程技术-工程:大洋
CiteScore
7.30
自引率
34.00%
发文量
2379
审稿时长
8.1 months
期刊介绍: Ocean Engineering provides a medium for the publication of original research and development work in the field of ocean engineering. Ocean Engineering seeks papers in the following topics.
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