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常规条件下油藏数值模拟数据三维可视化展示研究
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作者 陈健 王荣亮 淮志强 《石化技术》 CAS 2024年第1期148-150,共3页
油藏数值模拟技术的应用可以为油田寻找余油以及后期的调整挖潜提高重要的信息数据支持。该技术在油藏的互相关系研究分析、预测油藏开采以及方案调整等领域中应用具有重要的价值与作用。随着现代技术的高速发展,在人工智能等技术手段... 油藏数值模拟技术的应用可以为油田寻找余油以及后期的调整挖潜提高重要的信息数据支持。该技术在油藏的互相关系研究分析、预测油藏开采以及方案调整等领域中应用具有重要的价值与作用。随着现代技术的高速发展,在人工智能等技术手段的支持下常规条件下油藏数值模拟数据三维可视化也日益成熟。基于此,主要对常规条件下油藏数值模拟数据三维可视化的相关技术进行了阐述,基于油田实例,探究了常规条件下油藏数值模拟数据三维可视化技术的展示成果。 展开更多
关键词 常规条件 油藏数值模拟数据 三维可视化
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油藏数值模拟数据管理初探 被引量:2
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作者 苏欣 《承德石油高等专科学校学报》 CAS 2010年第3期19-23,共5页
油藏数值模拟、测井数据处理等商业软件在现在石油生产的勘探、开发过程中扮演着越来越为重要的角色。然而国内石油生产企业所使用的上述这些商业软件均为国外公司所有,价格昂贵,并且各种软件之间所使用的数据格式并不相同,不能互通使... 油藏数值模拟、测井数据处理等商业软件在现在石油生产的勘探、开发过程中扮演着越来越为重要的角色。然而国内石油生产企业所使用的上述这些商业软件均为国外公司所有,价格昂贵,并且各种软件之间所使用的数据格式并不相同,不能互通使用。通过对商业化的油藏数值模拟数据格式进行分析与重构,将这些数据存储为国产油藏数值模拟软件能够读取的格式,使各种格式的数据的为我所用,从而提高石油勘探、开发效率。 展开更多
关键词 油藏数值模拟 油藏数据格式 油藏数值模拟数据管理
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激光传输数值模拟数据的三维可视化研究 被引量:5
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作者 黎万义 王鹏 +3 位作者 张军伟 耿远超 粟敬钦 景峰 《激光与光电子学进展》 CSCD 北大核心 2017年第11期261-266,共6页
大型激光装置具有结构复杂、设计与仿真模型众多以及数据多样等特点,并且设计与仿真结果通常使用不同的软件平台进行展示,没有形成统一的集成平台和数据可视化及交互系统。针对上述问题,提出了一种基于三维引擎Three.js和数据可视化库Vi... 大型激光装置具有结构复杂、设计与仿真模型众多以及数据多样等特点,并且设计与仿真结果通常使用不同的软件平台进行展示,没有形成统一的集成平台和数据可视化及交互系统。针对上述问题,提出了一种基于三维引擎Three.js和数据可视化库Vis.js的激光传输数值模拟数据三维可视化方法,并开发了相应的可视化系统。首先给出激光传输数值模拟数据三维可视化系统的体系结构,然后对功能模块的划分和关键算法进行设计,并给出系统的实现手段,最后对系统运行效果进行展示与总结。结果表明,所开发的系统可用于大型激光器激光传输结构设计结果和模拟数据的可视化,能有效改善激光驱动器光路设计和传输模拟的可视化效果。 展开更多
关键词 激光器 大型激光装置 三维可视化 三维引擎Three.Js 数据可视化库Vis.js 数值模拟数据
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编写Vb程序控制Excel处理数值模拟的数据
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作者 金鹏 戴显著 《电子制作》 2014年第16期55-56,共2页
本文利用VB编程控制电子表格Excel处理数值模拟之后产生的大量数据,实现结果数据处理可视化,并提高数据处理准确性并节约时间。
关键词 VB编程 数值模拟数据
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基于BP神经网络的并行算法
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作者 钟静 傅彦 《重庆三峡学院学报》 2006年第3期19-21,共3页
对强激光与等离子体相互作用三维数值模拟程序LARED_P数据输出进行分析,针对大规模数据模拟数据的特点,提出了基于BP神经网络的并行算法,即在各个搜索子空间内对训练集合中的学习样本进行并行训练。实例表明:不仅可避免陷入局部极小点,... 对强激光与等离子体相互作用三维数值模拟程序LARED_P数据输出进行分析,针对大规模数据模拟数据的特点,提出了基于BP神经网络的并行算法,即在各个搜索子空间内对训练集合中的学习样本进行并行训练。实例表明:不仅可避免陷入局部极小点,提高网络训练速度,而且仿真效果较好。 展开更多
关键词 BP神经网络 并行训练 大规模数值模拟数据
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中国物理海洋学研究70年:发展历程、学术成就概览 被引量:14
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作者 魏泽勋 郑全安 +39 位作者 杨永增 刘克修 徐腾飞 王凡 胡石建 谢玲玲 李元龙 杜岩 周磊 林霄沛 胡建宇 朱建荣 李均益 张正光 侯一筠 刘泽 田纪伟 黄晓冬 管玉平 刘志宇 杨庆轩 赵玮 宋振亚 刘海龙 董昌明 于卫东 连涛 陈朝晖 史久新 雷瑞波 刘煜 于福江 尹宝树 陈戈 王岩峰 李整林 熊学军 汪嘉宁 李晓峰 王永刚 《海洋学报》 CAS CSCD 北大核心 2019年第10期23-64,共42页
本文概略评述新中国成立70年来物理海洋学各分支研究领域的发展历程和若干学术成就。中国物理海洋学研究起步于海浪、潮汐、近海环流与水团,以及以风暴潮为主的海洋气象灾害的研究。随着国力的增强,研究领域不断拓展,涌现了大量具有广... 本文概略评述新中国成立70年来物理海洋学各分支研究领域的发展历程和若干学术成就。中国物理海洋学研究起步于海浪、潮汐、近海环流与水团,以及以风暴潮为主的海洋气象灾害的研究。随着国力的增强,研究领域不断拓展,涌现了大量具有广泛影响力的研究成果,其中包括:提出了被国际广泛采用的“普遍风浪谱”和“涌浪谱”,发展了第三代海浪数值模式;提出了“准调和分析方法”和“潮汐潮流永久预报”等潮汐潮流的分析和预报方法;发现并命名了“棉兰老潜流”,揭示了东海黑潮的多核结构及其多尺度变异机理等,系统描述了太平洋西边界流系;提出了印度尼西亚贯穿流的南海分支(或称南海贯穿流);不断完善了中国近海陆架环流系统,在南海环流、黑潮及其分支、台湾暖流、闽浙沿岸流、黄海冷水团环流、黄海暖流、渤海环流,以及陆架波方面均取得了深刻的认识;从大气桥和海洋桥两个方面对太平洋–印度洋–大西洋洋际相互作用进行了系统的总结;发展了浅海水团的研究方法,基本摸清了中国近海水团的分布和消长特征与机制,在大洋和极地水团分布及运动研究方面也做出了重要贡献;阐明了南海中尺度涡的宏观特征和生成机制,揭示了中尺度涡的三维结构,定量评估了其全球物质与能量输运能力;基本摸清了中国近海海洋锋的空间分布和季节变化特征,提出了地形、正压不稳定和斜压不稳定等锋面动力学机制;构建了“南海内波潜标观测网”,实现了对内波生成–演变–消亡全过程机理的系统认识;发展了湍流的剪切不稳定理论,提出了海流“边缘不稳定”的概念,开发了海洋湍流模式,提出了湍流混合参数化的新方法等;在海洋内部混合机制和能量来源方面取得了新的认识,并阐述了混合对海洋深层环流、营养物质输运等过程的影响;研发了全球浪–潮–流耦合模式,推出一系列海洋与气候模式;发展了可同化主要海洋观测数据的海洋数据同化系统和用于ENSO预报的耦合同化系统;建立了达到国际水准的非地转(水槽/水池)和地转(旋转平台)物理模型实验平台;发展了ENSO预报的误差分析方法,建立了海洋和气候系统年代际变化的理论体系,揭示了中深层海洋对全球气候变化的响应;初步建成了中国近海海洋观测网;持续开展南北极调查研究;建立了台风、风暴潮、巨浪和海啸的业务化预报系统,为中国气象减灾提供保障;突破了国外的海洋技术封锁,研发了万米水深的深水水听器和海洋光学特性系列测量仪器;建立了溢油、危险化学品漂移扩散等预测模型,为伴随海洋资源开发所带来的风险事故的应急处理和预警预报提供科学支撑。文中引用的大量学术成果文献(每位第一作者优选不超过3篇)显示,经过70年的发展,中国物理海洋学研究培养了一支实力雄厚的科研队伍,这是最宝贵的成果。这支队伍必将成为中国物理海洋学研究攀登新高峰的主力军。 展开更多
关键词 物理海洋学 海浪 潮汐 海平面 大洋环流 水团 陆架与边缘海环流 海洋中尺度过程 湍流与混合 数值模拟数据同化 实验室模拟 大洋与气候 海冰与极地考察 海洋气象与灾害 海洋物理学 海洋环境
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Study on Collision Between Two Ships Using Selected Parameters in Collision Simulation 被引量:2
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作者 Dong-Myung Bae Aditya Rio Prabowo +2 位作者 Bo Cao Ahmad Fauzan Zakki Gunawan Dwi Haryadi 《Journal of Marine Science and Application》 CSCD 2016年第1期63-72,共10页
In the present analysis, several parameters used in a numerical simulation are investigated in an integrated study to obtain their influence on the process and results of this simulation. The parameters studied are el... In the present analysis, several parameters used in a numerical simulation are investigated in an integrated study to obtain their influence on the process and results of this simulation. The parameters studied are element formulation, friction coefficient, and material model. Numerical simulations using the non-linear finite element method are conducted to produce virtual experimental data for several collision scenarios. Pattern and size damages caused by collision in a real accident case are assumed as real experimental data, and these are used to validate the method. The element model study performed indicates that the Belytschko-Tsay element formulation should be recommended for use in virtual experiments. It is recommended that the real value of the friction coefficient for materials involved is applied in simulations. For the study of the material model, the application of materials with high yield strength is recommended for use in the side hull structure. 展开更多
关键词 ship collision collision accident non-linear finite element collision parameter hull structure
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Turbulence Model Investigations on the Boundary Layer Flow with Adverse Pressure Gradients 被引量:1
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作者 Yong Zhao Zhi Zong +1 位作者 Li Zoli Tianlin Wang 《Journal of Marine Science and Application》 CSCD 2015年第2期170-174,共5页
In this paper, a numerical study of flow in the turbulence boundary layer with adverse and pressure gradients (APGs) is conducted by using Reynolds-averaged Navier-Stokes (RANS) equations. This research chooses si... In this paper, a numerical study of flow in the turbulence boundary layer with adverse and pressure gradients (APGs) is conducted by using Reynolds-averaged Navier-Stokes (RANS) equations. This research chooses six typical turbulence models, which are critical to the computing precision, and to evaluating the issue of APGs. Local frictional resistance coefficient is compared between numerical and experimental results. The same comparisons of dimensionless averaged velocity profiles are also performed. It is found that results generated by Wilcox (2006) k-co are most close to the experimental data. Meanwhile, turbulent quantities such as turbulent kinetic energy and Reynolds-stress are also studied. 展开更多
关键词 adverse pressure gradient turbulent boundary layer turbulence models local frictional resistance coefficient RANS Reynolds-stress
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Numerical simulation of land subsidence and verification of its character for an iron mine using sublevel caving 被引量:11
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作者 Cao Shuai Song Weidong +2 位作者 Deng Dan Lei Yuankun Lan Jianqiang 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第2期327-332,共6页
Combined with a digital bored photography system and in-situ statistics concerning the joints and fissures of both ore-body and surrounding rock,a 2D discrete model was constructed using UDEC.The stress field and disp... Combined with a digital bored photography system and in-situ statistics concerning the joints and fissures of both ore-body and surrounding rock,a 2D discrete model was constructed using UDEC.The stress field and displacement field changes of different sublevel stoping systems were also studied.Changes in the overlying rock strata settlement pattern has been analyzed and validated by in-situ monitoring data.The results show that:in the caving process,there exists an obvious delay and jump for the overlying rock strata displacement over time,and a stable arch can be formed in the process of caving,which leads to hidden goafs.Disturbed by the mining activity,a stress increase occurred in both the hanging wall and the foot wall,demonstrating a hump-shaped distribution pattern.From the comparison between simulation results and in-situ monitoring results,land subsidence shows a slow-development,suddenfailure,slow-development cycle pattern,which leads eventually to a stable state.This pattern validates the existence of balanced arch and hidden goafs. 展开更多
关键词 Block caving Joint survey UDEC model Ground settlement Balanced arch Hidden goafs
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Comparison of numerical simulations and experiments in conical gas–solid spouted bed 被引量:2
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作者 王淑彦 邵宝力 +4 位作者 刘锐 赵健 刘扬 刘义坤 杨树人 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第10期1579-1586,共8页
Flow behavior of gas and particles in conical spouted beds is experimentally studied and simulated using the twofluid gas-solid model with the kinetic theory of granular flow.The bed pressure drop and fountain height ... Flow behavior of gas and particles in conical spouted beds is experimentally studied and simulated using the twofluid gas-solid model with the kinetic theory of granular flow.The bed pressure drop and fountain height are measured in a conical spouted bed of 100 mm I.D.at different gas velocities.The simulation results are compared with measurements of bed pressure drop and fountain height.The comparison shows that the drag coefficient model used in cylindrical beds under-predicted bed pressure drop and fountain height in conical spouted beds due to the partial weight of particles supported by the inclined side walls.It is found that the numerical results using the drag coefficient model proposed based on the conical spouted bed in this study are in good agreement with experimental data.The present study provides a useful basis for further works on the CFD simulation of conical spouted bed. 展开更多
关键词 FLUIDIZATION Simulation EXPERIMENT Conical spouted bed Drag coefficient model Computational fluid dynamics
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Numerical simulation and preliminary analysis on ocean waves during Typhoon Nesat in South China Sea and adjacent areas 被引量:3
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作者 王际朝 张杰 杨俊钢 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2014年第3期665-680,共16页
Using the wave model WAVEWATCH III(WW3), we simulated the generation and propagation of typhoon waves in the South China Sea and adjacent areas during the passage of typhoon Nesat(2011). In the domain 100°–145&#... Using the wave model WAVEWATCH III(WW3), we simulated the generation and propagation of typhoon waves in the South China Sea and adjacent areas during the passage of typhoon Nesat(2011). In the domain 100°–145°E and 0°–35°N, the model was forced by the cross-calibrated multi-platform(CCMP) wind fi elds of September 15 to October 5, 2011. We then validated the simulation results against wave radar data observed from an oil platform and altimeter data from the Jason-2 satellite. The simulated waves were characterized by fi ve points along track using the Spectrum Integration Method(SIM) and the Spectrum Partitioning Method(SPM), by which wind sea and swell components of the 1D and 2D wave spectra are separated. There was reasonable agreement between the model results and observations, although the WW3 wave model may underestimate swell wave height. Signifi cant wave heights are large along the typhoon track and are noticeably greater on the right of the track than on the left. Swells from the east are largely unable to enter the South China Sea because of the obstruction due to the Philippine Islands. During the initial stage and later period of the typhoon, swells at the fi ve points were generated by the propagation of waves that were created by typhoons Haitang and Nalgae. Of the two methods, the 2D SPM method is more accurate than the 1D SIM which overestimates the separation frequency under low winds, but the SIM method is more convenient because it does not require wind speed and wave direction. When the typhoon left the area, the wind sea fractions decreased rapidly. Under similar wind conditions, the points located in the South China Sea are affected less than those points situated in the open sea because of the infl uence of the complex internal topography of the South China Sea. The results reveal the characteristic wind sea and swell features of the South China Sea and adjacent areas in response to typhoon Nesat, and provide a reference for swell forecasting and offshore structural designs. 展开更多
关键词 TYPHOON WAVEWATCH III (WW3) cross-calibrated multi-platform (CCMP) South China Sea significant wave height SWELL
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A case study on behaviors of composite soil nailed wall with bored piles in a deep excavation 被引量:7
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作者 ZHU Feng-bin MIAO Lin-chang +1 位作者 GU Huan-da CHENG Yue-hong 《Journal of Central South University》 SCIE EI CAS 2013年第7期2017-2024,共8页
A complete case of a deep excavation was explored. According to the practical working conditions, a 3D non-linear finite element procedure is used to simulate a deep excavation supported by the composite soil nailed w... A complete case of a deep excavation was explored. According to the practical working conditions, a 3D non-linear finite element procedure is used to simulate a deep excavation supported by the composite soil nailed wall with bored piles in soft soil. The modified cam clay model is employed as the constitutive relationship of the soil in the numerical simulation. Results from the numerical analysis are fitted well with the field data, which indicate that the research approach used is reliable. Based on the field data and numerical results of the deep excavation supported by four different patterns of the composite soil nailed wall, the significant corner effect is founded in the 3D deep excavation. If bored piles or soil anchors are considered in the composite soil nailed wall, they are beneficial to decreasing deformations and internal forces of bored piles, cement mixing piles, soil anchors, soil nailings and soil around the deep excavation. Besides, the effects due to bored piles are more significant than those deduced from soil anchors. All mentioned above prove that the composite soil nailed wall with bored piles is feasible in the deep excavation. 展开更多
关键词 deep excavation 3D non-linear finite element bored pile composite soil nailed wall corner effect DEFORMATION internal force
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Meteorological Data Generation for the Numerical Simulation of Stratified Flow in the Joumine Reservoir, Tunisia
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作者 Tadaharu Ishikawa Kakeru Takahira +1 位作者 Mingyang Wang Mitsuteru Irie 《Journal of Environmental Science and Engineering(B)》 2014年第4期173-180,共8页
Dynamic numerical simulation of water conditions is useful for reservoir management. In remote semi-arid areas, however, meteorological and hydrological time-series data needed for computation are not frequently measu... Dynamic numerical simulation of water conditions is useful for reservoir management. In remote semi-arid areas, however, meteorological and hydrological time-series data needed for computation are not frequently measured and must be obtained using other information. This paper presents a case study of data generation for the computation of thermal conditions in the Joumine Reservoir, Tunisia. Data from the Wind Finder web site and daily sunshine duration at the nearest weather stations were utilized to generate cloud cover and solar radiation data based on meteorological correlations obtained in Japan, which is located at the same latitude as Tunisia. A time series of inflow water temperature was estimated from air temperature using a numerical filter expressed as a linear second-order differential equation. A numerical simulation using a vertical 2-D (two-dimensional) turbulent flow model for a stratified water body with generated data successfully reproduced seasonal thermal conditions in the reservoir, which were monitored using a thermistor chain. 展开更多
关键词 Meteorological data generation numerical simulation thermal stratification reservoir management.
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Numerical Simulation of a Landfall Typhoon Using a Bogus Data Assimilation Scheme
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作者 LU Bing WANG Bin ZHAO Ying 《Atmospheric and Oceanic Science Letters》 2011年第4期242-246,共5页
A typhoon bogus data assimilation scheme (BDA) using dimension-reduced projection four-dimen-sional variational data assimilation (DRP-4-DVar),called DRP-BDA for short,is built in the Advanced Regional Eta Model (AREM... A typhoon bogus data assimilation scheme (BDA) using dimension-reduced projection four-dimen-sional variational data assimilation (DRP-4-DVar),called DRP-BDA for short,is built in the Advanced Regional Eta Model (AREM).As an adjoint-free approach,DRP-BDA saves time,and only several minutes are taken for the full BDA process.To evaluate its performance,the DRP-BDA is applied to a case study on a landfall ty-phoon,Fengshen (2008),from the Northwestern Pacific Ocean to Guangdong province,in which the bogus sea level pressure (SLP) is assimilated as a kind of observa-tion.The results show that a more realistic typhoon with correct center position,stronger warm core vortex,and more reasonable wind fields is reproduced in the analyzed initial condition through the new approach.Compared with the control run (CTRL) initialized with NCEP Final (FNL) Global Tropospheric Analyses,the DRP-BDA leads to an evidently positive impact on typhoon track forecasting and a small positive impact on typhoon inten-sity forecasting.Furthermore,the forecast landfall time conforms to the observed landfall time,and the forecast track error at the 36th hour is 32 km,which is much less than that of the CTRL (450 km). 展开更多
关键词 DRP-4-DVar TYPHOON BDA
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Numerical Prediction of Flow Patterns after Various Pipe Fittings
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作者 Andreas Swienty Raja Abou Ackl Paul Uwe Thamsen 《Journal of Mechanics Engineering and Automation》 2015年第10期542-548,共7页
An accurate prediction of flows using CFD depends on a large number of factors. In addition to discretizing the flow region, the correct definition of boundary or initial conditions and the choice of suitable numerica... An accurate prediction of flows using CFD depends on a large number of factors. In addition to discretizing the flow region, the correct definition of boundary or initial conditions and the choice of suitable numerical methods, the applied turbulence model influences the results of the flow simulation to a great extent. Therefore, a validation of the results with the experimental data is of great importance for a correct selection of a turbulence model. It is the scope of this paper to assess different turbulence models for the simulation of pipe flows. The calculation results of pipe flows through a combination of 90~ elbows and a 1/3 segmental orifice are compared with experimental measurement results. This has the advantage that the suitability of the turbulence models for simulating both shear and swirl flows can be investigated. Thus, the k-ω, k-ε model and the Launder Reece Rodi Reynolds stress model are compared with each other and experimental results. Furthermore, this investigation is extended through including a much more c detached-eddy simulation. This model provides better prediction of the flow by resolving the large eddies and modeling the small ones. The experimental results originate from LDV measurements over the entire pipe cross-section. This measuring method provides velocity vectors over the measured surface. 展开更多
关键词 CFD turbulence models k-ε k-ω LRR DES.
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Seismic to Reservoir Simulation by Cooperative Inversion
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作者 Larry Lines Amir Shamsa 《Journal of Earth Science and Engineering》 2014年第7期410-414,共5页
Cooperative inversion for petroleum reservoir characterization produces an Earth model that fits all available geological, geophysical and reservoir production data to within acceptable error criteria. The mathematica... Cooperative inversion for petroleum reservoir characterization produces an Earth model that fits all available geological, geophysical and reservoir production data to within acceptable error criteria. The mathematical formulation for the inversion requires an appropriate modeling description of both seismic wave propagation and reservoir fluid flow. The inversion requires the minimization of an objective function which is the weighted sum of model misfits for both geophysical and production data. While the complete automation of cooperative inversion may be unrealistic or intractable, geophysical data can provide useful information for enhancing heavy oil production. A methodology is given to demonstrate possible cooperative inversion application in heavy oil reservoirs. 展开更多
关键词 Reservoir characterization cooperative inversion heavyoil 4-D seismology.
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Sound propagation from the shelfbreak to deep water 被引量:4
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作者 QIN JiXing ZHANG RenHe +3 位作者 LUO WenYu PENG ZhaoHui LIU JianJun WANG DeJun 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第6期1031-1037,共7页
Motivated by a phenomenon in an experiment conducted in the Northwestern Pacific indicating that the energy of the received signal around the sound channel axis is much greater than that at shallower depths,we study s... Motivated by a phenomenon in an experiment conducted in the Northwestern Pacific indicating that the energy of the received signal around the sound channel axis is much greater than that at shallower depths,we study sound propagation from the transitional area(shelfbreak)to deep water.Numerical simulations with different source depths are first performed,from which we reach the following conclusions.When the source is located near the sea surface,sound will be strongly attenuated by bottom losses in a range-independent oceanic environment,whereas it can propagate to a very long range because of the continental slope.When the source is mounted on the bottom in shallow water,acoustic energy will be trapped near the sound channel axis,and it converges more evidently than the case where the source is located near the sea surface.Then,numerical simulations with different source ranges are performed.By comparing the relative energy level in the vertical direction between the numerical simulations and the experimental data,the range of the air-gun source can be approximated. 展开更多
关键词 sound propagation transitional area deep water parabolic equation
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Numerical simulation and data assimilation of the water-energy cycle over semiarid northeastern China 被引量:1
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作者 WEN XiaoHang LIAO XiaoHan +6 位作者 YUAN WenPing YAN XiaoDong WEI ZhiGang LIU HuiZhi FENG JinMing LU ShiHua DONG WenJie 《Science China Earth Sciences》 SCIE EI CAS 2014年第10期2340-2356,共17页
The default fractional vegetation cover and terrain height were replaced by the estimated fractional vegetation cover, which was calculated by the Normalized Difference Vegetation Index (NDVI) of Earth Observing Sys... The default fractional vegetation cover and terrain height were replaced by the estimated fractional vegetation cover, which was calculated by the Normalized Difference Vegetation Index (NDVI) of Earth Observing System Moderate-Resolution Im- aging Spectroradiometer (EOS-MODIS) and the Digital Elevation Model of the Shuttle Radar Topography Mission (SRTM) system. The near-surface meteorological elements over northeastern China were assimilated into the three-dimensional varia- tional data assimilation system (3DVar) module in the Weather Research and Forecasting (WRF) model. The structure and daily variations of air temperature, humidity, wind and energy fields over northeastern China were simulated using the WRF model. Four groups of numerical experiments were performed, and the simulation results were analyzed of latent heat flux, sensible heat flux, and their relationships with changes in the surface energy flux due to soil moisture and precipitation over different surfaces. The simulations were compared with observations of the stations Tongyu, Naiman, Jinzhou, and Miyun from June to August, 2009. The results showed that the WRF model achieves high-quality simulations of the diurnal charac- teristics of the surface layer temperature, wind direction, net radiation, sensible heat flux, and latent heat flux over semiarid northeastern China in the summer. The simulated near-surface temperature, relative humidity, and wind speed were improved in the data assimilation case (Case 2) compared with control case (Case 1). The simulated sensible heat fluxes and surface heat fluxes were improved by the land surface parameterization case (Case 3) and the combined case (Case 4). The simulated tem- poral variations in soil moisture over the northeastern arid areas agree well with observations in Case 4, but the simulated pre- cipitation should be improved in the WRF model. This study could improve the land surface parameters by utilizing remote sensing data and could further improve atmospheric elements with a data assimilation system. This work provides an effective attempt at combining multi-source data with different spatial and temporal scales into numerical simulations. The assimilation datasets generated by this work can be applied to research on climate change and environmental monitoring of add lands, as well as research on the formation and stability of climate over semiarid areas. 展开更多
关键词 WRF model data assimilation water-energy cycle semiarid northeastern China
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3D Flow Past Transonic Turbine Cascade SE 1050-Experiment and Numerical Simulations 被引量:3
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作者 D.imurda J.Fürst M.Luxa 《Journal of Thermal Science》 SCIE EI CAS CSCD 2013年第4期311-319,共9页
This paper is concerned with experimental and numerical research on 3D flow past prismatic turbine cascade SE1050 (known in QNET network as open test case SE1050). The primary goal was to assess the influence of the... This paper is concerned with experimental and numerical research on 3D flow past prismatic turbine cascade SE1050 (known in QNET network as open test case SE1050). The primary goal was to assess the influence of the inlet velocity profile on the flow structures in the interblade channel and on the flow field parameters at the cascade exit and to compare these findings to results of numerical simulations. Investigations of 3D flow past the cascade with non-uniform inlet velocity profile were carried out both experimentally and numerically at subsonic (M2 = 0.8) and at transonic (M2 = 1.2) regime at design angle of incidence. Experimental data was obtained using a traversing device with a five-hole conical probe. Numerically, the 3D flow was simulated by open source code OpenFOAM and in-house code. Analyses of experimental data and CFD simulations have revealed the development of distinctive vortex structures resulting from non-uniform inlet velocity profile. Origin of these structures results in increased loss of kinetic energy and spanwise shift of kinetic energy loss coefficient distribution. Differences found between the subsonic and the transonic case confirm earlier findings available in the literature. Results of CFD and experiments agree reasonably well. 展开更多
关键词 blade cascade vortex structures transonic flow CFD
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Recent advances in regional air-sea coupled models 被引量:6
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作者 PENG ShiQiu LIU DuanLing +1 位作者 SUN ZhaoBo LI YiNeng 《Science China Earth Sciences》 SCIE EI CAS 2012年第9期1391-1405,共15页
In this paper,we first briefly review the history of air-sea coupled models,and then introduce the current status and recent advances of regional air-sea coupled models.In particular,we discuss the core technical and ... In this paper,we first briefly review the history of air-sea coupled models,and then introduce the current status and recent advances of regional air-sea coupled models.In particular,we discuss the core technical and scientific issues involved in the development of regional coupled models,including the coupling technique,lateral boundary conditions,the coupling with sea waves(ices),and data assimilation.Furthermore,we introduce the application of regional coupled models in numerical simulation and dynamical downscaling.Finally,we discuss the existing problems and future directions in the development of regional air-sea coupled models. 展开更多
关键词 regional air-sea coupled models lateral boundary conditions data assimilation COUPLER dynamical downscaling
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