段塞流是油氣混輸過程中油氣輸送通道路徑改變而引起的一種特殊現(xiàn)象,導(dǎo)致流體壓力波動并進(jìn)而和結(jié)構(gòu)耦合。對于深水立管系統(tǒng),這種動力耦合嚴(yán)重惡化了系統(tǒng)的動力響應(yīng),是立管的疲勞破壞的主要因素之一。由于段塞流形成過程流體瞬時壓力波動及其傳播的機(jī)理和規(guī)律沒能突破,段塞流和立管系統(tǒng)的耦合作用的研究更加困難。本博士論文就是在這種背景下開展的相關(guān)理論和數(shù)值模擬工作,核心進(jìn)展體現(xiàn)在:1、通過深入研究段塞流的形成及與立管結(jié)構(gòu)相互作用的機(jī)理,建立了反映段塞流與深水立管動力耦合的立管系統(tǒng)動力學(xué)模型及相應(yīng)微分方程,為嚴(yán)重段塞流條件下立管系統(tǒng)的設(shè)計和安全運(yùn)行奠定了理論基礎(chǔ)。2、提出了一種ANHE-FD混合算法,即應(yīng)用ANHE（Adaptive Node-Based Height Evaluator）算法結(jié)合有限差分（FD,Finite Difference）,獲得了嚴(yán)重段塞過程中立管振動方程的數(shù)值解法。這為嚴(yán)重段塞流的流體與結(jié)構(gòu)相互作用（FSI）分析提供了計算技術(shù)。3、將多相流模擬器OLGA 7和結(jié)構(gòu)分析軟件ABAQUS有機(jī)結(jié)合起來,提出了解決嚴(yán)重段塞流與深水立管動力耦合的數(shù)值計算方法,為得到整個立管系統(tǒng)在段塞流過程... 

【文章來源】：中國石油大學(xué)(北京)北京市 211工程院校 教育部直屬院校

【文章頁數(shù)】：158 頁

【學(xué)位級別】：博士

【文章目錄】：
摘要
ABSTRACT
INNOVATION POINTS
Chapter1 Research Background
    1.1 Multiphase flows
        1.1.1 Two-phase flows
        1.1.2 Three-phase flows
    1.2 Two-phase flow patterns
        1.2.1 Flow patterns in horizontal pipes
        1.2.2 Flow patterns in a vertical pipe
        1.2.3 Flow patterns map
    1.3 Overview of severe slugging phenomenon
    1.4 Review on the hydrodynamics of offshore slender structures
        1.4.1 Flow-induced vibrations
        1.4.2 Dynamical models for riser pipe analysis
        1.4.3 Numerical solution methods for differential equations
    1.5 Load spectrum for offshore riser structures
    1.6 Aims of this thesis
    1.7 Scope
Chapter2 Two-phase Flow Patterns for Severe Slugging in Deepwater Flowline-Riser System:An Experimental Investigation
    2.1 Overview of liquid-liquid two-phase flows
    2.2 Experimental materials and test facility
        2.2.1 Test facility
        2.2.2 Test fluids
        2.2.3 Experimental procedure
    2.3 Flow pattern behaviour of the liquid-liquid two-phase flow test
        2.3.1 Stratified flow（ST）
        2.3.2 Stratified flow with mixing interface（ST&MI）
w?0）">        2.3.3 Dispersion of water in oil flow（ D_w?0）
        2.3.4 Water holdup analysis（ ）
    2.4 Summary of this Chapter
Chapter3 Numerical Simulation of Severe Slugging and its Stress Impact on Deepwater Risers:A Coupled Numerical Technique
    3.1 Brief introduction
    3.2 Numerical Simulation Procedures in OLGA 7
        3.2.1 Generating fluid properties table for the fluid model
        3.2.2 Modeling of the contextual pipeline-riser geometry
        3.2.3 Inlet and boundary conditions
        3.2.4 Slug tracking and pressure-time series predictions
    3.3 Numerical Simulation Procedures with ABAQUS 6.14
        3.3.1 Flowline-riser pipe cross-section
        3.3.2 Material assignment
        3.3.3 Elastic property for the steel material
        3.3.4 Plastic property for the steel material
        3.3.5 Load and boundary conditions
        3.3.6 Meshing of the part instance
        3.3.7 Simulation algorithm
    3.4 Stress analysis
        3.4.1 Normal stress
        3.4.2 Shear stress analysis
        3.4.3 Von mises stress analysis
    3.5 Summary of this Chapter
Chapter4 A Mathematical Model for the Interaction Between Severe Slug Buildup and Dynamic Response of a Top-tensioned Riser
    4.1 Overview
    4.2 Mathematical model for the riser pipe analysis
        4.2.1 Boundary conditions for the riser model
        4.2.2 Initial conditions
    4.3 Solution to the governing equations of motion of the riser model
        4.3.1 Approximations to the equation?s derivatives
        4.3.2 Spatial and temporal discretisation schemes
        4.3.3 Description of ANHE algorithm for the time-variant slug buildup in the riser
    4.4 Vibrational analysis of the riser structure
        4.4.1 Transverse displacement of the riser pipe
        4.4.2 Spatial displacement of the riser structure
        4.4.3 Effect of liquid velocity on transverse displacement of the riser
    4.5 Summary of this Chapter
Chapter5 Dynamic Characterisation of Deepwater Risers During Severe Slug Buildup
    5.1 Introduction
    5.2 Physical and mathematical model for the deepwater riser structure
    5.3 Dynamic solution of the riser structure
        5.3.1 Transverse vibration of the riser structure
        5.3.2 Spatial displacement of the riser at different time increment
        5.3.3 Effect of liquid velocity on transverse vibration of the riser
        5.3.4 Impact of liquid fallback on dynamic response of slender structure
        5.3.5 Effect of volumetric gas fraction and slip ratio on riser vibration
        5.3.6 Severity of liquid slugs on the vibrational response of different riser length
        5.3.7 Damping frequency analysis of different riser to liquid slug load
    5.4 Numerical simulation of the present problem with Abaqus6.
        5.4.1 3Dmodel of the riser structure and its mesh properties
        5.4.2 Material and mesh properties for the fluid model
        5.4.3 Boundary and initial conditions of the fluid domain
        5.4.4 Loads and boundary conditions for the coupled fluid and and structure models
        5.4.5 Modal analysis
    5.5 Comparative result analysis
        5.5.1 Transverse vibration of the scaled riser
        5.5.2 Spatial deflection of the scaled riser structure
        5.5.3 Comparison of the finite difference solution to other literature
Chapter6 Conclusions and Recommendations
    6.1 Conclusions
    6.2 Recommendations
References
LIST OF FIGURES
LIST OF TABLES
NOMENCLATURE
ACKNOWLEDGEMENTS
AUTOBIOGRAPHY AND ACADEMIC PAPERS PUBLISHED
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