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Finite element analysis for inclined wellbore stability of transversely iso-tropic rock with HMCD coupling based on weak plane strength criterion

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Science China(Technological Sciences) 2017年第4期60卷 624-637页

作者： WANG Yongliang ZHUANG Zhuo liU Zhanli YANG Henglin li chenfeng Applied Mechanics Laboratory School of Aerospace Engineering Tsinghua University Zienkiewicz Centre for Computational Engineering & Energy Safety Research Institute College of Engineering Swansea University Drilling Research Institute China National Petroleum Corporation

The finite element analysis(FEA) technology by hydraulic-mechanical-chemical-damage(HMCD) coupling is proposed in this paper for inclined wellbore stability analysis of water-sensitive and laminated rock, developed basing on the recently established FEA technology for transversely isotropic rock with hydraulic-mechanical-damage(HMD) coupling. The chemical activity of the drilling fluid is considered as phenomenological hydration behavior, the moisture content and parameters of rock considering hydration could be determined with time. The finite element(FE) solutions of numerical wellbore model considering the chemical activity of drilling fluid, damage tensor calculation and weak plane strength criterion for transversely isotropic rock are developed for researching the wellbore failure characteristics and computing the time-dependent collapse and fracture pressure of laminated rock as shale reservoirs. A three-dimensional FE model and elastic solid deformation and seepage flow coupled equations are developed, and the damage tensor calculation technology for transversely isotropic rock are realized by introducing effect of the hydration and the stress state under the current load. The proposed method utilizing weak plane strength criterion fully reflects the strength parameters in rock matrix and weak plane. To the end, an effective and reliable numerically three-step FEA strategy is well established for wellbore stability analysis. Numerical examples are given to show that the proposed method can establish efficient and applicable FE model and be suitable for analyzing the timedependsolutions of pore pressure and stresses, and the evolution region considering the hydration surrounding wellbore,furthermore to compute the collapse cycling time and the safe mud weight for collapse and fracture pressure of transversely isotropic rock.

关键词： finite element analysis wellbore stability transversely isotropic rock hydraulic-mechanical-chemical-damage coupling weak plane strength criterion

Shape-free finite element method:The plane hybrid stress-function (HS-F) element method for anisotropic materials

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Science China(Physics,Mechanics & Astronomy) 2011年第4期54卷 653-665页

作者： CEN Song FU XiangRong ZHOU GuoHua ZHOU MingJue li chenfeng Department of Engineering Mechanics School of Aerospace Tsinghua University Beijing 100084 China College of Water Conservancy & Civil Engineering China Agricultural University Beijing 100083 China Civil & Computational Engineering Centre School of Engineering Swansea University Swansea SA2 8PP UK Key laboratory of Applied Mechanics School of Aerospace Tsinghua University Beijing 100084 China

The sensitivity problem to mesh distortion and the low accuracy problem of the stress solutions are two inherent difficulties in the finite element *** applying the fundamental analytical solutions (in global Cartesian coordinates) to the Airy stress function of the anisotropic materials,8-and 12-node plane quadrilateral hybrid stress-function (HS-F) elements are successfully developed based on the principle of the minimum complementary *** results show that the present new elements exhibit much better and more robust performance in both displacement and stress solutions than those obtained from other *** can still perform very well even when the element shapes degenerate into a triangle and a concave *** is also demonstrated that the proposed construction procedure is an effective way for developing shape-free finite element models which can completely overcome the sensitivity problem to mesh distortion and can produce highly accurate stress solutions.

关键词： finite element hybrid stress-function (HS-F) element shape-free stress function the principle of minimum complementary energy fundamental analytical solutions anisotropic materials

Visual Simulation of Multiple Fluids in Computer Graphics： A State-of-the-Art Report

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Journal of Computer Science & Technology 2018年第3期33卷 431-451页

作者： Bo Ren Xu-Yun Yang Ming C. lin Nils Thuerey Matthias Teschner chenfeng li College of Computer and Control Engineering Nankai University Tianjin 300071 China Department of Computer Science University of Maryland College Park MD 20742 U.S.A Department of Informatics Technical University of Munich Munich 80333 Germany Department of Computer Science University of Freiburg Freiburg 79098 Germany College of Engineering Swansea University Swansea SA28PP U.K.

Realistic animation of various interactions between multiple fluids, possibly undergoing phase change, is a challenging task in computer graphics. The visual scope of multi-phase multi-fluid phenomena covers complex tangled surface structures and rich color variations, which can greatly enhance visual effect in graphics applications. Describing such phenomena requires more complex models to handle challenges involving the calculation of interactions, dynamics and spatial distribution of multiple phases, which are often involved and hard to obtain real-time performance. Recently, a diverse set of algorithms have been introduced to implement the complex multi-fluid phenomena based on the governing physical laws and novel discretization methods to accelerate the overall computation while ensuring numerical stability. By sorting through the target phenomena of recent research in the broad subject of multiple fluids, this state-of-the-art report summarizes recent advances on multi-fluid simulation in computer graphics.

关键词： physical simulation multiple fluids computer graphics

A simple approach for bubble modelling from multiphase fluid simulation

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Computational Visual Media 2015年第2期1卷 171-181页

作者： Bo Ren Yuntao Jiang chenfeng li Ming C.lin CCCE&CS Nankai University Department of Computer Science and Technology Tsinghua University College of Engineering Swansea University Department of Computer Science University of North Carolina at Chapel Hill

This article presents a novel and flexible bubble modelling technique for multi-fluid simulations using a volume fraction representation. By combining the volume fraction data obtained from a primary multi-fluid simulation with simple and efficient secondary bubble simulation, a range of real-world bubble phenomena are captured with a high degree of physical realism, including large bubble deformation,sub-cell bubble motion, bubble stacking over the liquid surface, bubble volume change, dissolving of bubbles,etc. Without any change in the primary multi-fluid simulator, our bubble modelling approach is applicable to any multi-fluid simulator based on the volume fraction representation.

关键词： bubble volume fraction smoothed particle hydrodynamics fluid simulation

Physics-based fuid simulation in computer graphics: Survey, research trends, and challenges

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Computational Visual Media 2024年第5期10卷 803-858页

作者： Xiaokun Wang Yanrui Xu Sinuo liu Bo Ren Jiri Kosinka Alexandru C.Telea Jiamin Wang Chongming Song Jian Chang chenfeng li Jian Jun Zhang Xiaojuan Ban Beijing Advanced Innovation Center for Materials Genome Engineering and School of Intelligence Science and Technologyand Shunde Innovation School University of Science and Technology BeijingBeijing 100083China National Center for Computer Animation Faculty of Media and CommunicationBournemouth UniversityPoole BH125BBUK. Bernoulli Institute University of GroningenGroningen 9700 AKthe Netherlands School of Computer Science Peking UniversityBeijing 100871China. TMCC College of Computer ScienceNankai UniversityTianjin 300350China Department of Information and Computing Sciences Utrecht UniversityUtrecht 3584 CCthe Netherlands. Zienkiewicz Institute for Modelling Data and AISwansea UniversitySwansea SA18ENUK. Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China.

Physics-based fluid simulation has played an increasingly important role in the computer graphics *** methods in this area have greatly improved the generation of complex visual effects and its computational *** techniques have emerged to deal with complex boundaries,multiphase fluids,gas-liquid interfaces,and fine *** parallel use of machine learning,image processing,and fluid control technologies has brought many interesting and novel research *** this survey,we provide an introduction to theoretical concepts underpinning physics-based fuid simulation and their practical implementation,with the aim for it to serve as a guide for both newcomers and seasoned researchers to explore the field of physics-based fuid simulation,with a focus on developments in the last *** by the distribution of recent publications in the field,we structure our survey to cover physical background;discretization approaches;computational methods that address scalability;fuid interactions with other materials and interfaces;and methods for expressive aspects of surface detail and *** a practical perspective,we give an overview of existing implementations available for the above methods.

关键词： computer graphics physical simulation fluid simulation fluid coupling

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大直径系泊钢缆轴向强度缩减值评估

华中科技大学学报（自然科学版） 2015年第4期43卷 84-88页

作者：邹佳星任慧龙李陈峰哈尔滨工程大学船舶工程学院黑龙江哈尔滨150001

针对六股钢缆和螺旋式钢缆提出海洋工程系泊钢缆轴向破断载荷计算的新方法.以钢缆结构为基础建立钢缆轴向强度计算的力学模型并进行简化处理.因钢缆断丝引起强度缩减且无法确定其断点的准确位置,为此考虑内部钢丝摩擦力并通过对钢缆的... 详细信息

针对六股钢缆和螺旋式钢缆提出海洋工程系泊钢缆轴向破断载荷计算的新方法.以钢缆结构为基础建立钢缆轴向强度计算的力学模型并进行简化处理.因钢缆断丝引起强度缩减且无法确定其断点的准确位置,为此考虑内部钢丝摩擦力并通过对钢缆的断丝分布进行概率计算及给出钢丝分布概率模型,提供钢缆轴向破断载荷缩减的计算及分析过程.突破了规范法计算轴向强度缩减时对钢缆类型的限制.通过大量计算各种钢丝绳破断载荷,将统计结果同API规范强度公式计算结果及设计值进行对比,结果显示该算法精度及稳定性较好.

关键词：系泊系统钢缆强度缩减断丝等效断丝概率模型

极端海况下FPSO系泊系统安全性评估与分析

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哈尔滨工程大学学报 2015年第1期36卷 104-108页

作者：邹佳星任慧龙李陈峰哈尔滨工程大学船舶工程学院黑龙江哈尔滨150001

针对近年极端海洋性气候频发所导致的FPSO系泊系统安全性问题,从服役多年系泊系统钢缆的剩余强度入手,评估影响船体运动的环境参数,给出系泊钢缆的安全系数。利用准静态的方法估算环境等级的范围,选取南海某型FPSO建立系泊系统耦合计算... 详细信息

针对近年极端海洋性气候频发所导致的FPSO系泊系统安全性问题,从服役多年系泊系统钢缆的剩余强度入手,评估影响船体运动的环境参数,给出系泊钢缆的安全系数。利用准静态的方法估算环境等级的范围,选取南海某型FPSO建立系泊系统耦合计算模型。应用AQWA-DRAFT与AQWA-NAUT模块,采用时域非线性方法对系泊系统进行耦合分析,在满足规范系数的前提下确定现服役系泊系统的定位能力,预报系泊系统所能承受的最大风浪流极值组合及对应的台风等级。通过计算可看出钢缆强度的下降直接影响着系泊系统的定位能力,导致其无法抵御百年一遇的台风,系泊系统可抵御台风等级降至12级。

关键词：系泊系统系泊钢缆剩余强度安全系数评估环境等级评估环境极值预报极端海况 FPSO

船舶碰撞下自升式平台结构强度及主要撞击参数分析

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哈尔滨工程大学学报 2012年第9期33卷 1067-1074页

作者：林一李陈峰田明琦哈尔滨工程大学船舶工程学院黑龙江哈尔滨150001 上海中集海洋工程研发中心上海201206

自升式平台在工作状态下存在较高的与船舶碰撞的风险,不仅会危及自身整体安全性,更会导致其工作停滞,造成经济损失.相较于其他平台,自升式平台柔性更大,但结构冗余度更低.为了合理评估其遭遇船舶碰撞后的结构安全性,对其碰撞动力响应和... 详细信息

自升式平台在工作状态下存在较高的与船舶碰撞的风险,不仅会危及自身整体安全性,更会导致其工作停滞,造成经济损失.相较于其他平台,自升式平台柔性更大,但结构冗余度更低.为了合理评估其遭遇船舶碰撞后的结构安全性,对其碰撞动力响应和结构强度进行分析是很有必要的.基于非线性有限元分析方法,以某300英尺工作水深的自升式平台为例,提出了一种考虑初始状态和剩余强度的自升式平台/船舶碰撞的结构强度评估方法.在此基础上,针对主要撞击参数对于碰撞动力响应及结构损伤的影响进行了分析.结果表明,目标平台在假定碰撞工况下具有相当的剩余承载能力,撞击参数的影响不可忽略.

关键词：自升式平台船舶碰撞撞击参数结构强度

深水钻井平台钻台运动下高压泥浆管线强度评估

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哈尔滨工程大学学报 2013年第1期34卷 40-45页

作者：曾骥李陈峰任慧龙甄春博哈尔滨工程大学船舶工程学院黑龙江哈尔滨150001

针对深水钻井平台钻台与主船体运动不同步导致高压泥浆管线存在安全隐患的问题,提出了高压泥浆管线强度评估方法.该方法基于有限元直接计算法,根据百年一遇设计载荷确定钻台运动的幅值,建立管线有限元模型,分析钻台运动下高压泥浆管线... 详细信息

针对深水钻井平台钻台与主船体运动不同步导致高压泥浆管线存在安全隐患的问题,提出了高压泥浆管线强度评估方法.该方法基于有限元直接计算法,根据百年一遇设计载荷确定钻台运动的幅值,建立管线有限元模型,分析钻台运动下高压泥浆管线的结构应力,进行屈服强度校核.在此基础上,基于S-N曲线和Miner线性累积损伤理论,建立了钻台运动下高压泥浆管线疲劳强度评估方法.最后,对"海洋石油981"深水钻井平台的高压泥浆管线进行了强度评估,并对有关管线的支座进行了优化设计.研究方法对于海洋平台高压泥浆管线的设计与强度校核具有参考价值.

关键词：海洋平台高压泥浆管线强迫运动疲劳强度优化设计