深水立管入水过程中涡激耦合振动特性分析
Dynamic Characteristics of Drilling Risers as Being Entered into Deep Water
DOI: 10.12677/JOGT.2020.422024, PDF,    国家自然科学基金支持
作者: 张 颖, 朱卫平*：上海大学，力学与工程科学学院，上海市应用数学和力学研究所，上海市能源工程力学重点实验室， 上海
关键词: 深水；柔性隔水管；涡激振动；三维模型；范德波尔尾迹模型；流固耦合；Deep Water； Flexible Riser； Vortex-Induced Vibration； 3D-Model； Van der Pol Wake Model； Fluid-Structure Interaction
摘要: 本文基于哈密顿原理，建立了一种柔性立管涡激振动(VIV)的三维有限元动力学模型。该模型考虑了管内流体的流动，而管外尾迹(wake)由一组沿立管变化的并与立管侧向加速度相耦合的范德波尔振子模型(van der Pol oscillator wake model)加以模拟，水深以千米计。立管上端可以设置下入速度，可以随平台移动和摆动，下端则可以悬挂重物(如防喷器)和自由运动，也可以与水下井口连接。基于该模型，本文模拟了在一定的潮流、风流和波浪条件下，带或不带浮力块的隔水管下入过程中的动力学响应，重点讨论了悬挂重量、进入速度、入水深度对隔水管下端落点偏离、上端最大拉应力及全管最大弯曲应力的影响。本文处理的是一种典型的内外流固耦合振问题和复杂初边值问题，为后续有关研究提供了有效的计算分析工具。
Abstract: Based on the Hamilton principle, a three-dimensional finite element dynamic model is established in this paper for investigating the vortex-induced vibration (VIV) of a flexible riser in deep water in kilometers. The model includes the fluid flowing within the riser, and the wake outside the riser is modeled by the van der Pol wake oscillators which are distributed along the riser length and coupled with the lateral accelerations of the riser. In addition to setting an entering speed, the upper end of the riser can be in movements with the platform, while the lower end can either move and swing with the additional weight (such as blowout preventer, BOP), or be connected to the underwater wellhead. Using the proposed models, the VIVs of therisersbared or partially wearing with buoyant blocks were simulated in the currents caused by tide, wind and waves. The effects of the entry speed, BOP weight and water depth on the deviation of the lower end of the riser, the maximum tensile stress at the upper end and the maximum bending stress throughout the riser are discussed especially. This study deals with a typical internal and external fluid-solid coupled vibration problem, involving in the complex initial-boundary values, and aims to providing an effective tool in calculation and analysis for the subsequent related researches.
文章引用：张颖, 朱卫平. 深水立管入水过程中涡激耦合振动特性分析[J]. 石油天然气学报, 2020, 42(2): 124-137. https://doi.org/10.12677/JOGT.2020.422024

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