Numerical Modeling of the Interaction Between Severe Slugging Parameters and Dynamic Behavior of Steel Flexible Risers
作者单位：中国石油大学(北京)
学位级别：硕士
导师姓名：段梦兰;MAC DARLINGTON ONUOHA
授予年度：2022年
学科分类：0820[工学-石油与天然气工程] 08[工学] 082002[工学-油气田开发工程]
主 题：Severe slugging steel flexible riser fluid-structure interaction Abaqus MpCCI
摘 要：Severe slugging is a transient and unsteady flow regime that occurs in offshore flowlines-riser production systems,most prevalently on aged oil fields which are proned to heavier oil deposits,low flow rates and the peculiar nature of the unevenness of the seabed *** phenomenon is characterized with pressure fluctuations and instabilities of the flow *** behaviour of this flow regime poses a threat on the structural integrity,reliability and safety of the offshore production facilities due to its fatigue loading behaviour and damage of the material *** researchers in China and abroad have made contributions towards describing the dynamic behavior of pipeline-riser structures induced by severe slug ***,due to the complicated nature of severe slugging,no study has fully understood the dynamic behavior of steel lazy-wave risers induced by a full-staged severe slug flow which this research draws its originality *** is therefore in the interest of the offshore oil and gas industry to improve and optimize the fatigue design of deepwater riser structures by including the fatigue loads from severe *** study presents the numerical modelling and simulation of the interaction between the full-staged severe slug flow and the dynamic behavior and stress impact of a steel lazy-wave *** fluid analysis,structural analysis and the FSI coupling were carried out using FLUENT,ABAQUS and Mp CCI software programs,*** two-phase flow system is modelled with a comingling flow of water and air with liquid and gas velocities of 0.382m/s and 1.37m/s *** 2D steel lazy-wave riser was modelled with material properties of API Grade X-65 steel with an inner diameter of 0.05 m,outer diameter of 0.075 m,pipe length of 1.8m and a pipe inclination of-5 *** uniform meshes with wall refinement were used to generate15,599 mesh elements for the fluid *** volume of fluid(VOF)model,kepsilon turbulence
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