检索结果-南通市图书馆

Large-eddy simulations of the Richtmyer-Meshkov instability of rectangular interfaces accelerated by shock waves

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2010年第12期53卷 905-914页

作者： WANG Tao,BAI JingSong,LI Ping & LIU Kun institute of fluid physics,China Academy of Engineering physics,Mianyang 62.900,China 1. institute of fluid physics China Academy of Engineering Physics Mianyang 621900 China

A parallel algorithm and code MVFT(multi-viscous-fluid and turbulence) of large-eddy simulation(LES) is developed from our MVPPM(multi-viscous-fluid piecewise parabolic method),and performed to solve the multi compressible Navier-Stokes(N-S) *** effect of the unresolved subgrid-scale(SGS) motions on the large scales is represented by different SGS stress models in LES.A Richtmyer-Meshkov instability experiment of the evolution of a rectangular block of SF6,which occupies half of the height of the {2. tube test section,following the interaction with a planar {2. wave,is numerically and exhaustively simulated by this *** comparison between experimental and simulated images of the evolving SF6 block shows that they are *** numerical simulations reproduce the complex developing process of SF6 block,which grows *** geometric quantities that characterize the extents of SF6 block are also compared in detail between numerical simulations and experiment with good agreements between them,a quantitative demonstration of the developing law of SF6 *** is an evident discrepancy between the three numerical simulations for the maximum position of the right edge of block at the late stage,because the right interface grows complicated and the dissipation is different for different SGS *** SGS turbulent dissipation,molecular viscosity dissipation and SGS turbulent kinetic energy have been studied and *** have a similar distribution to the large eddy *** SGS turbulent dissipation is much greater than the molecular viscosity dissipation;the SGS turbulent dissipation of Vreman model is smaller than the Smagorinsky *** general,the simulated results of Vreman SGS model are better compared with the dynamic viscosity and Smagorinsky SGS *** vorticity and circulation deposition on the block interface have also been investigated.

关键词： large-eddy simulation Navier-Stokes equations subgrid-scale Richtmyer-Meshkov instability turbulent dissipation turbulent kinetic energy circulation deposition

同方期刊数据库

Geothermal and fluid flowing simulation of ore-forming antimony deposits in Xikuangshan

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2006年第8期49卷 862-871页

作者： YANG Ruiyan1,2. MA Dongsheng2. BAO Zhengyu3, PAN Jiayong2. CAO Shuanglin2.& XIA Fei2.1. School of Mathematics and physics, China University of Geosciences, Wuhan 430074, China 2. State Key Laboratory for research of Mineral Deposits, Nanjing University, Nanjing 2.0093, China 3. Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China 1. School of Mathematics and physics China University of Geosciences Wuhan 430074 China 2. State Key Laboratory for research of Mineral Deposits Nanjing University Nanjing 210093 China 3. Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China

The Xikuangshan Antimony Deposit located in the Mid-Hunan Basin, China, is the larg- est antimony deposit in the world. Based on the hydrogeological and geochemical data collected from four sections, Xikuangshan-Dajienao (AO), Xikuangshan-Dashengshan (BO), Xikuang- shan-Longshan (CO) and Dafengshan (DO) in the Basin, an advanced metallogenic model related to deep-cyclic meteoric water of Xikuangshan Antimony Deposit is put forward in this paper using a model of heat-gravity-driving fluid flow transportation. The simulation results show that the ore-forming fluid of the deposit mainly comes from the Dashengshan and Longshan areas where BO and CO sections are located if the overall basin keeps a constant atmospheric precipitation and infiltration rate during mineralization, and that the average transportation speed of the ore-forming fluids is about 0.2.0.4 m/a.

关键词： ore-forming fluid, numerical simulation, geothermal field, geofluid transport, Xikuangshan, antimony deposits.

Influence of atmospheric heat sources over the Tibetan Plateau and the tropical western North Pacific on the inter-decadal variations of the stratosphere-troposphere exchange of water vapor

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2008年第8期51卷 1179-1193页

作者： ZHAN RuiFen1,2.LI JianPing2.1Shanghai Typhoon institute of China Meteorological Administration,Shanghai 2.0030,China 2.tate Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical fluid Dynamics(LASG),institute of Atmospheric physics,Chinese Academy of Sciences,Beijing 10002.,China 1. Shanghai Typhoon institute of China Meteorological Administration Shanghai 200030 China 2. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

This study investigates the Stratosphere-Troposphere Exchange(STE) of water vapor,emphasizes its interdecadal variations over Asia in boreal summer,and discusses the influences of atmospheric heat sources over the Tibetan Plateau and the tropical western North Pacific(WNP) on them by using the Wei method with reanalysis data from the European Centre for Medium-Range Weather Forecasts(ECMWF) for the years of *** climatology shows that the upward transport of water vapor across the tropopause in boreal summer is the most robust over the joining area of the South Asian Peninsula and Indian-Pacific Oceans(defined as AIPO).The upward transport over there can persistently convey the abundant water vapor into the stratosphere and then influence the distribution and variation of the stratospheric water *** analysis shows that interdecadal variations of the water vapor exchange over the AIPO are significant,and its abrupt change occurred in the mid-1970s and the early *** these three periods,as important channels of the water vapor exchange,the effect of Bay of Bengal-East Asia as well as South China Sea was gradually weakening,while the role of the WNP becomes more and more *** studies show that atmospheric heat sources over the Tibetan Plateau and the WNP are two main factors in determining the interdecadal variations of water vapor *** thermal influences over the Tibetan Plateau and the WNP have been greatly adjusted over the pass 44 *** synthesis influences the interdecadal variations of the water vapor exchange by changing the Asian summer monsoon,but their roles vary with time and *** after 1992.the influence of heat source over the Tibetan Plateau remarkably weakens,while the heat source over the WNP dominates the across-tropopause water vapor *** have important implications for understanding the transport of other components in the atmosphere and estimating the impact of human activities(

关键词： Tibetan Plateau tropical western North Pacific atmospheric heat source STE inter-decadal variations

Dominant climate factors influencing the Arctic runoff and association between the Arctic runoff and sea ice

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2010年第5期29卷 10-20页

作者： LI Pixue ZHANG Zhanhai LIU Jiping Ocean University of China Qingdao 266100 China Polar research institute of China Shanghai 200136 China State Key Laboratory of Numerical Modeling for Atmospheric Science and Geophysical fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Shanghai Marine Environmental Monitoring and Forecasting Center Shanghai 200232 China

By using the Arctic runoff data from R-ArcticNET V4.0 and ArcticRIMS,trends of four major rivers flowing into the Arctic Ocean,whose climate factor plays an important role in determining the variability of the Arctic runoff,are *** results show that for the past 30 years,the trend of the Arctic runoff is seasonally *** is a significant trend in spring and winter and a significant decreasing trend in summer,leading to the reduced seasonal *** spring,surface air temperature is the dominant factor influencing the four *** summer,precipitation is the most important factor for Lena and Mackenzie,while snow cover is the most important factor for Yenisei and *** Mackenzie,atmospheric circulation does play an important role for all the seasons,which is not the case for the Eurasian *** authors further discuss the relationships between the Arctic runoff and sea *** negative correlation is found at the mouth of the rivers into the Arctic Ocean in spring,while significant positive correlation is observed just at the north of the mouths of the rivers into the Arctic in *** addition,each river has different relationship with sea ice in the eastern Greenland Sea.

关键词： Arctic runoff multiple linear regressions sea ice

在线全文

学校读者我要写书评

暂无评论

全光纤VISAR系统中色散问题的研究

四川大学学报（自然科学版） 2003年第2期40卷 283-286页

作者：张小强周昕胡绍楼四川大学光电科学技术系成都610064 中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室四川绵阳621900

全光纤VISAR进入干涉仪能产生干涉的两光束光程差近似为零 ,是全光纤VISAR测速的前提条件 .对此 ,研究了低输入光功率时 ,单模光纤的色散对全光纤VISAR光程差的影响。

关键词：全光纤VISAR系统色散光程差全光纤速度干涉仪测速原理单模光纤光纤隔离器

A numerical study on Rayleigh-Taylor instability of aluminum plates driven by detonation

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2010年第2期53卷 195-198页

作者： HE ChangJiang,ZHOU HaiBing & HANG YiHong institute of Applied physics and Computational Mathematics,Laboratory of Computational physics,Beijing 100088,China 1. institute of Applied physics and Computational Mathematics Laboratory of Computational Physics Beijing 100088 China

The authors,using elastic-plastic hydrodynamic code,present the Rayleigh-Taylor (RT) instability of Al plates driven by high-explosive detonation. Our numerical study assumes the material is fluid,or it is an elastic-plastic solid,and we compare the results of these simulations with the experimental data. For the numerical simulation of Rayleigh-Taylor instability of the metal driven by high-explosive detonation,the elastic-plastic effect must be assumed. The result of the simulation is different from the experiment,using only equation of state. However,the growth of perturbation agrees well with the measured growth under the second assumption. There is a cutoff wavelength for RT instability of the metal. The growth of perturbation is stable for short wavelength. The growth increases rapidly as the wavelength increases.

关键词： interface instability elastic-plastic numerical simulation

Dynamic Strength of Tungsten Alloy Under shock Loading

在线全文

学校读者我要写书评

暂无评论

Dynamic Strength of Tungsten Alloy Under Shock Loading

18th International Conference on High Pressure Science and Technology

作者： Hua Jinsong Gong Zizheng Jing Fuqian Laboratory for shock wave and {2. physics research institute of fluid physics P.O.Box919-111 Mianyang Sichuan 62.900. P.R China Laboratory of High Pressure physics Southwest Jiaotong University Chengdu 610031 China

＜正＞This paper presents the loading/reloading and loading/unloading experiments for a kind of tungsten alloy by using the two-stage light gas gun, in which the sample/window （sapphire） interface velocity profiles are measured by VISAR technique. The dynamic yield strength of tungsten alloy under shock pressures of 104GPa, 130GPa and 190GPa were found to be 6.2.Pa, 5.8GPa and 5.2.Pa, respectively. Combined with the experimental data below 100GPa in the previous researches, the variation of yield strength of tungsten alloy under shock pressure is illustrated in Figure 1. The yield strength can be divided into three ranges. In the first range, from pressure about OGPa to 96GPa, the yield strength increase with pressure, its dependence on the pressure can be presented by linear relationship. In the second range, from pressure of 96GPa to 190GPa, the yield strength increase with pressure and reach a zenith at about 12.GPa firstly, and *** decrease with pressure slowly. In this range its variation can be described approximately by the second power of pressure. The third range, pressure above 190GPa, according to the reference [11], we could infer that the variation of yield strength is decreasing very fast with pressure to zero and finally the material will be in the fluid state. Such a mechanical behavior may be ascribed to the characteristics of its microstructure, and the movements and interaction of its dislocation.

关键词： Tungsten Alloy shock Compression Dynamic yield strength

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

四体相互作用对固氦压缩特性的贡献

物理学报 2003年第5期52卷 1218-1221页

作者：田春玲刘福生蔡灵仓经福谦西南交通大学高压物理实验室中国工程物理研究院流体物理研究所冲击波物理爆轰物理实验室绵阳621900

运用从头计算自洽场方法和原子团簇理论计算了高压下固氦原子间的四体势分量 .计算结果表明四体分量对结合能的贡献为正 ;随着压缩度增大四体势的贡献比例变大 .采用两体、三体、四体势和Aziz吸引势计算固氦零温状态方程并与实验测量相... 详细信息

运用从头计算自洽场方法和原子团簇理论计算了高压下固氦原子间的四体势分量 .计算结果表明四体分量对结合能的贡献为正 ;随着压缩度增大四体势的贡献比例变大 .采用两体、三体、四体势和Aziz吸引势计算固氦零温状态方程并与实验测量相比较 ,结果表明两体势对固氦的压缩性贡献了过多的正效应 ,加入三体分量的修正 ,仅在低于 10GPa时理论值与实验值相符很好 ,但考虑了四体势修正后能将理论值与实验值符合程度提高到 2

关键词：四体相互作用固氦压缩特性从头计算自治场方法原子团簇四体势状态方程

Computational properties of a new horizontal staggered grid

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2005年第9期48卷 1559-1568页

作者： LIU YudiState Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical fluid Dynamics, institute of Atmospheric {2., Chinese Academy of Sciences, Beijing 10002., China institute of Meteorology, PLA University of Science and Technology, Nanjing 2.1101, China 1. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical fluid Dynamics Institute of Atmospheric Ph Chinese Academy of Sciences 100029 Beijing China 2. institute of Meteorology PLA University of Science and Technology 211101 Nanjing China

This paper presents a new horizontal staggered grid (LE grid), which defines h at a gridpoint, and both u and v at the same mid-gridpoint along the x and y directions. A general method is used to deduce the dispersion relationships of describing inertia gravity waves on LE grid and Arakawa A―E grids, which are then compared with the analytical solution (AS) in re- solved or under-resolved cases, using two-order central difference or four-order compact differ- ence scheme from the frequency and group velocity. Results show that in both resolved and under-resolved cases, no matter whether two-order central difference or four-order compact dif- ference scheme is used, the frequency and group velocity discrete errors on LE grid in describing inertia gravity waves are smaller than those of Arakawa A―E grids. At the same time, it is only on LE or Arakawa grid C that the employment of a compact difference scheme of higher difference precision can improve their accuracy in describing inertia gravity waves. However, as for the other four grids (Arakawa A,B,D and E), when the difference precision increases, the accuracy of simulating inertia gravity waves decreases.

关键词： horizontal staggered grid, inertia gravity wave, LE grid, Arakawa A-E grid, compact difference scheme, central difference.