检索结果-南通市图书馆

Review of deep learning algorithms in molecular simulations and perspective applications on petroleum engineering

Geoscience Frontiers 2024年第2期15卷 55-67页

作者： Jie Liu Tao Zhang shuyu sun Physical Science and Engineering Division(PSE) Computational Transport Phenomena LaboratoryKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia

In the last few decades,deep learning(DL)has afforded solutions to macroscopic problems in petroleum engineering,but mechanistic problems at the microscale have not benefited from it.Mechanism studies have been the strong demands for the emerging projects,such as the gas storage and hydrate production,and for some problems encountered in the storage process,which are common found as the chemical interaction between injected gas and mineral,and the formation of hydrate.Emerging advances in DL technology enable solving molecular dynamics(MD)with quantum accuracy.The conventional quantum chemical method is computational expensive,whereas the classical MD method cannot guarantee high accuracy because of its empirical force field parameters.With the help of the DL force field,precision at the quantum chemistry level can be achieved in MD.Moreover,the DL force field promotes the computational speed compared with first-principles calculations.In this review,the basic knowledge of the molecular force field and deep neural network(DNN)is first introduced.Then,three representative opensource packages relevant to the DL force field are introduced.As the most common components in the development of oil and gas reservoirs,water and methane are studied from the aspects of computational efficiency and chemical reaction respectively,providing the foundation of oil and gas researches.However,in the oil and gas problems,the complex molecular topo structures and various element types set a high challenge for the DL techniques in MD.Regarding the computational efficiency,it needs improvement via GPU and parallel accelerations to compete with classical MD.Even with such difficulties,the booming of this technique in the area of petroleum engineering can be predictable.

关键词： Deep neural network Molecular dynamics Force field Petroleum engineering

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Simulation of buoyancy-induced turbulent flow from a hot horizontal jet

引用

Journal of Hydrodynamics 2014年第1期26卷 104-113页

作者： El-AMIN M.F. sun shuyu SALAM Amgad Computational Transport Phenomena Laboratory (CTPL) Division of Physical Sciences and EngineeringKing Abdullah University of Science and Technology

Experimental visualizations and numerical simulations of a horizontal hot water jet entering cold water into a rectangular storage tank are described. Three different temperature differences and their corresponding Reynolds numbers are considered. Both experimental visualization and numerical computations are carried out for the same flow and thermal conditions. The realizable k-e model is used for modeling the turbulent flow while the buoyancy is modeled using the Boussinesq approximation. Polynomial approximations of the water properties are used to compare with the Boussinesq approximation. Numerical solutions are obtained for unsteady flow while pressure, velocity, temperature and turbulence distributions inside the water tank as well as the Froude number are analyzed. The experimental visualizations are performed at intervals of five seconds for all different cases. The simulated results are compared with the visualized results, and both of them show the stratification phenomena and buoyancy force effects due to temperature difference and density variation. After certain times, depending on the case condition, the flow tends to reach a steady state.

关键词： turbulent flow realizablc k - e turbulence model heat transfer jet heat storage

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical simulation and analysis of confined turbulent buoyant jet with variable source

引用

Journal of Hydrodynamics 2015年第6期27卷 955-968页

作者： EL-AMIN Mohamed F. AL-GHAMDI Abdulmajeed SALAMA Amgad sun shuyu Mathematics Department Faculty of ScienceAswan University Computational Transport Phenomena Laboratory(CTPL) Division of Physical Sciences and Engineering(PSE)King Abdullah University of Science and Technology(KAUST) College of Engineering and Islamic Architecture Umm Al-Qura University

In this work, experimental and numerical investigations are undertaken for confined buoyant turbulent jet with varying inlet temperatures. Results of the experimental work and numerical simulations for the problem under consideration are presented. Four cases of different variable inlet temperatures and different flow rates are considered. The realizable k-ε turbulence model is used to model the turbulent flow. Comparisons show good agreements between simulated and measured results. The average devia- tion of the simulated temperature by realizable k-ε turbulent model and the measured temperature is within 2%. The results indicate that temperatures along the vertical axis vary, generally, in nonlinear fashion as opposed to the approximately linear varia- tion that was observed for the constant inlet temperature that was done in a previous work. Furthermore, thermal stratification exits, particularly closer to the entrance region. Further away from the entrance region the variation in temperatures becomes relatively smaller. The stratification is observed since the start of the experiment and continues during the whole course. Numerical experime- nts for constant, monotone increasing and monotone decreasing of inlet temperature are done to show its effect on the buoyancy force in terms of Richardson number.

关键词： realizable k-ε model turbulent jet stratification heat stores CFD

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

居住权对老年婚姻法律机制构建的推动作用

引用

船舶职业教育 2024年第2期12卷 75-77页

作者：孙枢宇黑龙江大学黑龙江哈尔滨150080

随着我国进入老龄社会,老年婚姻逐渐成为不容忽视的现象,对金钱、精神及生活质量等方面的需求也是老年婚姻区别于传统两性婚姻的主要原因。我国应高度重视老年婚姻法律机制的构建,消除老年人及其子女的顾虑。通过分析婚姻模式的转变、... 详细信息

随着我国进入老龄社会,老年婚姻逐渐成为不容忽视的现象,对金钱、精神及生活质量等方面的需求也是老年婚姻区别于传统两性婚姻的主要原因。我国应高度重视老年婚姻法律机制的构建,消除老年人及其子女的顾虑。通过分析婚姻模式的转变、老年人婚姻的产生原因及现实阻碍,探究居住权对老年人婚姻的推动作用,并提出相关的建议,构建适合我国老年型社会的老年婚姻法律机制。

关键词：老年婚姻居住权遗嘱继承

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

天然氢开采和集输中的相平衡分析

引用

深圳大学学报（理工版） 2024年第2期41卷 163-172页

作者：章涛白桦黄天相刘杰孙树瑜阿卜杜拉国王科技大学物理科学与工程学院沙特阿拉伯图瓦23955-6900 中国国家石油天然气管网集团北京100013

为了提升对天然氢这种新兴能源的开采工艺和长距离输送技术,着眼于天然氢产物作为多组分混合物复杂的热力学性质,旨在探索根据多组分相平衡结果提升天然氢开采、提纯和管道运输工艺.从热力学第二定律入手,遵循系统总能减少、总熵增加的... 详细信息

为了提升对天然氢这种新兴能源的开采工艺和长距离输送技术,着眼于天然氢产物作为多组分混合物复杂的热力学性质,旨在探索根据多组分相平衡结果提升天然氢开采、提纯和管道运输工艺.从热力学第二定律入手,遵循系统总能减少、总熵增加的准则,借助昂萨格倒易关系构造物质的量和体积随时间的演变格式,形成一套热力学守恒的闪蒸计算方法,并证明该算法的能量递减性质.在此迭代型闪蒸计算方法的基础上,建立热力学嵌入的神经网络架构.基于热力学分析提取环境温度和总摩尔浓度作为环境参数,选用各组分的临界温度、临界压力、偏心因子和摩尔分数作为组分热力学特征,共同构成输入参数.输出层将得到相稳定测试的结果,即平衡态时流体中总的相数以及相分离计算的结果,可得平衡态时气液两相的摩尔组成,从而应用于多组分相平衡的快速预测.利用迭代型闪蒸算法获取足量数据用于机器学习模型的训练与神经网络架构的调参,设计了高度自适应的深度学习算法和相应的深层神经网络结构,采用机器学习技术,调优网络超参和基本架构,获得提升神经网络的训练效率和预测精度.借助这套准确、快速的相平衡预测技术,分析不同天然氢产物组成下的相平衡状态分布,并为氢气提纯和二氧化碳分离封存提供可行性工艺建议.将相平衡快速预测模型耦合到输气管道智能调控系统中,实现对天然气管道掺氢输送中管道运行安全的智能检测和满足输气供应需求的智能调控.

关键词：新能源多相流热物理学氢能多组分多相流机器学习管道调控

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

An Energy Stable SPH Method for Incompressible Fluid Flow

引用

Advances in Applied Mathematics and Mechanics 2022年第5期14卷 1201-1224页

作者： Xingyu Zhu shuyu sun Jisheng Kou Computational Transport Phenomena Laboratory Division of Physical Science and EngineeringKing Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia School of Civil Engineering Shaoxing UniversityShaoxing 312000ZhejiangChina School of Mathematics and Statistics Hubei Engineering UniversityXiaogan 432000HubeiChina

In this paper,a novel unconditionally energy stable Smoothed Particle Hydrodynamics(SPH)method is proposed and implemented for incompressible fluid flows.In this method,we apply operator splitting to break the momentum equation into equations involving the non-pressure term and pressure term separately.The idea behind the splitting is to simplify the calculation while still maintaining energy stability,and the resulted algorithm,a type of improved pressure correction scheme,is both efficient and energy stable.We show in detail that energy stability is preserved at each full-time step,ensuring unconditionally numerical stability.Numerical examples are presented and compared to the analytical solutions,suggesting that the proposed method has better accuracy and stability.Moreover,we observe that if we are interested in steady-state solutions only,our method has good performance as it can achieve the steady-state solutions rapidly and accurately.

关键词： Particle method Smoothed Particle Hydrodynamics(SPH)method incompressible fluid flow energy stability numerical stability

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

成渝城市群经济高质量发展测度与障碍因子分析

引用

西南科技大学学报（哲学社会科学版） 2024年第1期41卷 43-51页

作者：刘垚李富田孙书毓西南科技大学经济管理学院四川绵阳621010 中共眉山市委党校四川眉山620020

本文以新发展理念为核心指标构建综合指标体系,采用熵权topsis法对成渝城市群2011—2020年经济高质量发展指数进行测度,深入剖析了成渝城市群经济高质量发展的静态格局和动态演进趋势,并使用障碍度模型测算高质量发展的主要障碍因子。... 详细信息

本文以新发展理念为核心指标构建综合指标体系,采用熵权topsis法对成渝城市群2011—2020年经济高质量发展指数进行测度,深入剖析了成渝城市群经济高质量发展的静态格局和动态演进趋势,并使用障碍度模型测算高质量发展的主要障碍因子。研究发现,成渝城市群经济高质量发展水平呈逐年上升趋势,地区间发展水平差距较大但有逐年收窄的趋势;空间分布上,呈现“两头高、中间低”的态势;自然断点分组中,高水平和较高水平城市数量少,较低水平和低水平城市数量较多,但随着时间发展较高水平、较低水平城市数量逐渐增加,结构趋近于“橄榄型”;分项指标中,创新、协调、绿色、开放和共享五个子维度呈现不同的分布形态和演进趋势,主要准则层障碍因子为创新、开放和共享。

关键词：成渝城市群经济高质量发展熵权topsis法核密度估计障碍度模型

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Clinical Significance of Platelet Activation Glycoproteins GPⅡb/Ⅲa, CD62p and CD63 in Pregnancy- Induced Hypertension

引用

美国中华健康卫生杂志 2005年第4期8卷 38-41页

作者： WANG Qian sun shuyu ZHAN Fengxia Qilu Hospital of Shandong University Jinan 250100 China East Campus Hospital of Shandong University Jinan China

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Numerical simulation of a buried hot crude oil pipeline during shutdown

引用

Petroleum Science 2010年第1期7卷 73-82页

作者： Xu Cheng Yu Bo Zhang Zhengwei Zhang Jinjun Wei Jinjia sun shuyu Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum Beijing 102249China Zhejiang Department Preparatory Team PetroChina West East Gas Pipeline Company Hangzhou Zhejiang 310000 China State Key Laboratory of Multiphase Flow in Power Engineering Xi＇an Jiaotong University Xi＇an Shaanxi 710049 China Department of Mathematical Sciences Clemson University Clemson SC 29634-0975 USA

In this paper a mathematical model is built for a buried hot crude oil pipeline during shutdown, and an unstructured grid and polar coordinate grid are respectively applied to generating grids for the soil region and the three layers in the pipe （wax layer, pipe wall, and corrosion-inhibiting coating）. The governing equations are discretized using the finite volume method. The variations in temperatures of static oil and soil were investigated during pipeline shutdown in both summer and winter, in which some important parameters of the soil and crude oils of a Northeast pipeline are employed.

关键词： Moving boundary stagnation point equivalent thermal conductivity thermal influence region unstructured grid

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

STABILITY AND CONVERGENCE ANALYSIS OF SECOND-ORDER SCHEMES FOR A DIFFUSE INTERFACE MODEL WITH PENG-ROBINSON EQUATION OF STATE

引用

Journal of Computational Mathematics 2017年第6期35卷 737-765页

作者： Qiujin Peng Zhonghua Qiao shuyu sun Institute for Mathematical Sciences Renmin University of China Beijing 100872 China Department of Applied Mathematics The Hong Kong Polytechnic University Hung Horn Hong Kong Division of Physical Sciences and Engineering King Abdullah University of Science and Technology Thuwal 23955-6900 Kingdom of Saudi Arabia

In this paper, we present two second-order numerical schemes to solve the fourth order parabolic equation derived from a diffuse interface model with Peng-Robinson Equation of state （EOS） for pure substance. The mass conservation, energy decay property, unique solvability and L~ convergence of these two schemes are proved. Numerical results demon- strate the good approximation of the fourth order equation and confirm reliability of these two schemes.

关键词： Diffuse interface model Fourth order parabolic equation Energy stability,Convergence.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：