Vortex induced vibration and structural integrity of deep-water flexible risers

深水柔性立管的涡激振动和结构完整性

• 批准号: EP/K034243/1
• 负责人: Hamid Bahai
• 金额: $ 74.28万
• 依托单位: Brunel University London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2014
• 资助国家: 英国
• 起止时间: 2014 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FK034243%2F1
• 关键词: Vortex; induced; vibration; structural; integrity

The long flexible slender multi-layered pipes, called unbonded flexible risers, are considered as the new-generation risers for deep water applications. However their complex design and highly non-linear behviour coupled with the fact that they undergo types of extreme loadings which are different to those experienced by conventional rigid risers, currently pose many challenges to the offshore industry. The focus this work is on developing fluid, structural, and coupling models and the numerical procedures for the prediction of dynamic response of flexible risers due to vortex induced vibration, in cases where accurate simulation of their complex non-linear behaviour is a critical step in the analysis. In the structural simulation, it is intended to adopt a multi-scale non-linear finite element procedure which consistently links simulations conducted at a detailed small scale and a large structural scale. The fluid simulation work involves the development of a quasi-three-dimensional fluid code to model the cross flow around the flexible risers. The structural and fluid codes will be coupled together by developing an efficient fluid-solid interaction algorithm. The results from the numerical simulation will be validated against the results of experiments which will also be carried out as part of the project.

柔性细长多层管被称为无粘结柔性立管，被认为是深水应用的新一代立管。然而，其复杂的设计和高度的非线性行为，再加上其承受的极端载荷类型不同于传统的刚性立管，目前给海洋工业带来了许多挑战。这项工作的重点是开发流体、结构和耦合模型，以及预测柔性立管因涡激振动而产生的动态响应的数值程序，在这种情况下，对其复杂的非线性行为的准确模拟是分析的关键步骤。在结构模拟中，打算采用多尺度非线性有限元程序，该程序一致地将在详细的小尺度和大结构尺度上进行的模拟联系起来。流体模拟工作包括开发一种准三维流体程序来模拟柔性立管周围的横流。通过开发一种高效的流固相互作用算法，结构和流体程序将耦合在一起。数值模拟的结果将与实验结果进行验证，实验结果也将作为该项目的一部分进行。

项目成果

A nonlinear constitutive model for large-scale analysis of flexible risers

柔性立管大规模分析的非线性本构模型

• 发表时间: 2015
• 作者: M. T. Rahmati

Small-Scale FE Modelling for the Analysis of Flexible Risers

用于分析柔性立管的小规模有限元建模

• 发表时间: 2015
• 作者: M.T. Rahmati

A comparison between periodic and fixed BC for structural analysis of flexible risers

柔性立管结构分析中周期性BC与固定BC的比较

• 发表时间: 2015
• 作者: M. T. Rahmati

Using strip theory to model vibrations in offshore risers

• DOI: 10.1680/jencm.15.00022
• 发表时间: 2016-08
• 作者: S. H. Madani;J. Wissink;H. Bahai

An accurate and computationally efficient small-scale nonlinear FEA of flexible risers

精确且计算高效的柔性立管小规模非线性有限元分析

• DOI: 10.1016/j.oceaneng.2016.05.055
• 发表时间: 2016
• 期刊: Ocean Engineering
• 影响因子: 5
• 作者: Rahmati M