MUltiphase Flow-induced Fluid-flexible structure InteractioN in Subsea applications (MUFFINS)

MUFFINS项目汇集了来自纽卡斯尔大学、伦敦帝国理工学院、格拉斯哥大学的多学科团队，工业合作伙伴包括BP、雪佛龙、道达尔和Forsys Subsea，这些合作伙伴是瞬态多相流和流动保证联盟的成员，Wood集团、Xodus集团、orina和荷兰的TNO，以及学术合作伙伴新加坡国立大学，共同开发下一代的前沿技术和经济高效的工具，用于安全、高效、高效地开采油气。可靠、真实的海底系统（管道、立管、跳线和歧管）输送多相油气液气流动设计。这一世界领先的学术界与产业界的合作将首次加强英国在海上油气应用多相流设计方面的国际竞争力。提出的框架将专门解决内部多相流诱导振动（MFIV）和外部流涡诱导振动（VIV）领域的基础和实际挑战，由于复杂的流固耦合机制，其疲劳损伤效应可能是灾难性的，并导致昂贵的生产停机时间。从实际的角度来看，由管道几何形状、海底地形或热物理-流体动力不稳定性引起的液气段塞流是常见的，也是有问题的。这种流动具有高度复杂的流体力学性质，因为可变形相和可压缩相的不同力学特性导致了界面组合和相互作用的时空变化。海底布局结构、使用寿命和环境条件都会影响流管的相互作用模式。然而，对于MFIV水下结构的响应、应力和疲劳评估，目前还缺乏可靠的实用指南和系统框架。在设计这些受MFIV-VIV组合影响的结构时，会出现更大的复杂性和未知因素。通过将建模、仿真和实验相结合的综合方案，将执行高保真三维计算流体动力学，并开发一系列创新和经济高效的降阶模型，以捕获重要的多重MFIV和VIV效应，为详细的流动特征和流固耦合现象提供重要的见解。将通过将数值结果与实验测试和工业数据进行比较，进行验证、核实、不确定性和可靠性分析，以提高确定疲劳失效和安全风险可能性的信心。计算效率高的工具和开源代码将被工业和全球研究人员推进和利用。该项目将最大限度地减少与多尺度多物理场流体-弹性固体相互作用相关的MFIV-VIV预测的不确定性，最终提供改进的设计优化和最有效的多相流特征控制。50年来，英国油气行业一直是英国经济繁荣的核心，但最近却面临着重大挑战。2016年10月，英国政府成立了石油和天然气管理局，以保障合作，最大限度地从英国大陆架回收资源，并在未来的投资中保持英国的竞争力。根据这些战略，MUFFINS项目将通过尖端技术、经济高效的工具和推荐指南，为全球油气能源带来最大的效益和安全性，显著提高多相流海底系统的完整性、可靠性和安全性。该项目将提升石油和天然气领域下一代工程师和科学家的技能。技术诀窍和交付成果将导致结构设计的变革性改进，减少对环境的影响，运营和维护成本。

The MUFFINS project assembles a multidisciplinary team from Newcastle University, Imperial College London, University of Glasgow, industrial partners including BP, Chevron, TOTAL and Forsys Subsea, who are members of the Transient Multiphase Flow and Flow Assurance Consortium, Wood Group, Xodus Group, Orcina and TNO in the Netherlands, and an academic partner, the National University of Singapore, to develop the next generation of pioneering technologies and cost-efficient tools for the safe, reliable and real-life designs of subsea systems (pipelines, risers, jumpers and manifolds) transporting multiphase hydrocarbon liquid-gas flows. This world-leading academia-industry collaboration will be the first of its kind to strengthen the UK international competitiveness in multiphase flow designs for offshore oil and gas applications. The proposed framework will specifically address fundamental and practical challenges in areas of internal multiphase flow-induced vibration (MFIV), in combination with external flow vortex-induced vibration (VIV), whose fatigue damage effects due to complicated fluid-structure interaction mechanisms can be catastrophic and result in costly production downtime. From a practical viewpoint, liquid-gas slug flows induced by the pipe geometry, seabed topography or thermo-physic-hydrodynamic instability, are common and problematical. Such flows have a highly complex hydrodynamic nature as the different mechanical properties of the deformable and compressible phases cause spatial and temporal variability in the combination and interaction of the interfaces. Subsea layout architecture, operational lifetime and environmental conditions can all affect the flow-pipe interaction patterns. Nevertheless, reliable practical guidelines and systematic frameworks for the response, stress and fatigue assessment of subsea structures undergoing MFIV are lacking. Greater complexities and unknowns arise when designing these structures subject to combined MFIV-VIV. Through an integrated programme combining modelling, simulation and experiment, high-fidelity three-dimensional computational fluid dynamics will be performed and a hierarchy of innovative and cost-efficient reduced-order models will be developed to capture vital multiple MFIV and VIV effects, providing significant insights into detailed flow features and fluid-structure coupling phenomena. Validation, verification, uncertainty and reliability analyses will be carried out by comparing numerical results with experimental tests and industrial data to improve confidence in identifying the likelihood of fatigue failure and safety risks. Computationally-efficient tools and open-source codes will be advanced and utilised by industry and worldwide researchers. The project will minimise uncertainties in MFIV-VIV predictions associated with multi-scale multi-physics fluid-elastic solid interactions, ultimately delivering improved design optimisation and control of the most efficient multiphase flow features. The UK oil and gas industry has been at the heart of the UK prosperity for five decades but has faced significant challenges recently. In October 2016, the UK Government founded the Oil & Gas Authority to safeguard collaboration, maximise resource recovery from the UK Continental Shelf, and maintain the UK competitiveness with future investments. In alignment with these strategies, the MUFFINS project will deliver the maximum benefits to and security of global oil and gas energy by means of cutting-edge technologies, cost-efficient tools and recommended guidelines to significantly improve the integrity, reliability and safety of subsea systems transporting multiphase flows. The project will upskill the next-generation engineers and scientists in the oil and gas sector. The technical know-how and deliverables will lead to a transformative improvement in structural designs and reduction of environmental impacts, operational and maintenance costs.