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Numerical simulation of transient conjugate heat transfer with internal heat sourcesa Jiang Peixue, Ke Daoyou, Ren Zepei CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    1999, 16 (3): 302-308.   Abstract （380）      PDF （371KB）（17130）       Knowledge map    Conjugate heat transfer of transient thermal conduction,natural convection and thermal radiation with internal heat sources is simulated numerically using PHOENICS(Version 1.4) with the false density method.The flow field and temperature distribution are calculated using both the body fitted coordinates and Cartesian coordinates.The variation of the maximum temperature in the substance with internal heat sources is presented as function of the environmental temperature. Related Articles | Metrics

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A Calculation of Electron Hall Mobility in SiC WANG Ping, YANG Yin-tang, YANG Yan CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2006, 23 (1): 80-86.   Abstract （309）      PDF （282KB）（10901）       Knowledge map    With analysis of conduction band structure and isotropic relaxation time approximation, an analytical model for the electron Hall mobility and Hall scattering factor of n-type 6H-SiC is proposed. The impact of different scattering mechanisms on the low field electron transport in 6H-SiC is illustrated clearly. Three ellipsoidal and parabolic constant energy surfaces simplification are used. The calculated results are in good agreement with physical measurements. Related Articles | Metrics

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Digital Density in Hamaker Micro Continuum Medium Principle and Hamaker Constant TIAN Wen-chao, JIA Jian-yuan, CHEN Guang-yan CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2006, 23 (3): 366-370.   Abstract （255）      PDF （196KB）（7900）       Knowledge map    Based on Hamaker's hypothesizes and Lennard-Jones potential, a model of rigid sphere-panel nano-contact was presented to solve microcollision and nanocontact problems. The adhesion equations between the sphere and the first layer atoms or the N layer atoms of the panel were obtained by a continuum method. It is shown that the Hamaker's micro continuum medium principle is held only as the interaction distance 7 times greater than the atomic radius. Related Articles | Metrics

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Words from the chief editor Song JIANG Chinese Journal of Computational Physics    2024, 41 (1): 1-1.   Abstract （87）   HTML （20）    PDF （550KB）（5980）       Knowledge map    Reference | Related Articles | Metrics

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FINITE VOLUME METHODS FOR SOLVING THE PROBLEM OF DISCONTINUOUS SOLUTION WANG Ji-wen, LIU Ru-xun CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2001, 18 (2): 97-105.   Abstract （377）      PDF （342KB）（5334）       Knowledge map    A speedily developed numerical method called as finite volume method (FVM),which possesses both merits of finite difference method and finite element method,is devoloped.The construction of FVM for conservation laws is introduced.Especially,some efficient and successful schemes for solving the discontinuous problems are discussed in detail.Moreover,several numerical results of simulation of 2D dam break problem are given.Finally,a summary of advances in numerical applications and theoretical analysis of FVM is presented. Related Articles | Metrics

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Progress in Numerical Methods for Radiation Diffusion Equations YUAN Guangwei, HANG Xudeng, SHENG Zhiqiang, YUE Jingyan CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2009, 26 (4): 475-500.   Abstract （581）      PDF （1809KB）（3806）       Knowledge map    Radiative transfer in fluid flow of radiation hydrodynamics is studied.Kinetic laws under radiation condition are investigated.Practical radiation hydrodynamics process is complicated,and numerical simulation is one of primary research means.Splitting methods are often used in numerical simulation,in which fluid motion and radiation are computed separately.We discuss computational problems in radiation diffusion calculations.Diffusion schemes and nonlinear iterative methods on severely distorted meshes are studied.A brief introduction on research progress is given. Related Articles | Metrics

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Boundary Conditions in Lattice Boltzmann Method NIE De-ming, LIN Jian-zhong CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2004, 21 (1): 21-26.   Abstract （819）      PDF （250KB）（3775）       Knowledge map    Comparison and discussion of several boundary conditions in lattice Boltzmann method are presented. To achieve improved accuracy, a new method based on the idea of standard bounce-back scheme is proposed. Numerical simulations for two-dimensional Poiseuille flow and unsteady Couette flow are carried out using d2q9 model, and the results are identical to the analytical solutions. The convergence for different boundary treatments is discussed by changing single relaxation time τ and Re number. The results show that LBM can recover Navier-Stokes equation at low Mach number. It is also indicated that the errors for large τ are much bigger than those for τ close to 1. Related Articles | Metrics

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COMPUTING METHOD OF STOCHASTIC DIFFERENTIAL EQUATION AND IT'S APPLICATION LIU Xiao-qing, WU Sheng-Chang CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2002, 19 (1): 1-7.   Abstract （710）      PDF （288KB）（3639）       Knowledge map    Construction of discretization schemes, convergence principle, strongly convergent scheme and weakly convergent scheme for stochastic differential equations as well as computing method of jump stochastic differential equation are presented. Related partial differential equations are solved by probability method. Finally several examples in application are given. Related Articles | Metrics

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Study on Extreme Plasma Dynamics by Quantum Electrodynamic Particle-in-Cell Simulations CHANG Hengxin, XU Zheng, YAO Weipeng, XIE Yu, QIAO Bin CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2017, 34 (5): 526-542.   Abstract （1036）   HTML （25）    PDF （4769KB）（3482）       Knowledge map    Next generation petawatt laser facility is expected to reach intensity up to the order of 1023-1024 W·cm-2,which may generate electromagnetic fields so strong that nonlinear quantum electrodynamics (QED) processes play a crucial role in plasma dynamics.A large number of γ photons can be emitted through synchrotron radiation from ultrarelativistic electrons,and pair creation process can also be triggered when γ photons traverse electromagnetic fields.In turn,these QED physics can affect plasma dynamics itself significantly,in particular for electron motion under radiation reaction.In order to study such extreme plasma dynamics,we introduce a QED model developed in recent years,which can be coupled with traditional particle-in-cell (PIC) code,i.e.,so-called a QED-PIC code.Due to booming particle number caused by the newly emitted photons and created pairs,we also develop a particle merge algorithm to reduce the computational scale.Several applications of this contemporary QED-PIC code in modeling of ultraintense laser-plasma interaction and extreme astrophysical phenomena are presented. Reference | Related Articles | Metrics

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Key Technologies of Coupling for Multiphysics in Numerical Reactor DENG Li, SHI Dunfu, LI Gang CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2016, 33 (6): 631-638.   Abstract （1066）   HTML （116）    PDF （1623KB）（3454）       Knowledge map    With rapid development of computer and super computation, coupling for multi-physics,multi-scale and multi-process has become possible. Some lone process are integrated together. Some approximates from experience will be removed after all of the processes to be considered. This work is based on a virtual reactor. The goal is to improve precision by improvement of modeling and high fidelity computation. At present, study measures are changed from experiment and engineer dependent to theory analysis and numerical simulation. Numerical simulation will become more and more important. In this paper, CASL and NURESAFE are introduced. Then, several challenges, which include key technologies of software, are put forward in development of nuclear energy. Finally, suggestions are given for numerical reactor. It is only for reference and discussion. Reference | Related Articles | Metrics

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Progress in Research on Stochastic Neutron Dynamics and Its Numerical Simulation YANG Junyun, YING Yangjun, XIAO Gang CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2017, 34 (2): 127-141.   Abstract （763）   HTML （119）    PDF （2459KB）（3319）       Knowledge map    Stochastic neutron dynamics is important task in nuclear power plant design and nuclear reactor safety. In this paper, basic concepts and research methods for stochastic neutron kinetics are introduced and historical development and research status in the field are sketched out. Multiplicities of fission neutrons and photons are main sources of zero power reactor noise. Based on description equation of neutron fluctuation and its solution, stochastic theory of zero power and power reactor noise is evolved. Stochastic neutron dynamics are applied in important areas such as reactivity microscopic measurement, power reactor noise measurement and analysis, nuclear criticality excursion analysis, nuclear material detection and identification and so on. In the past half century, however, it lacks available method and tool to implement quantitative analysis of problems such as probability distribution of burst waiting time of neutron initiation in pulse reactor. In recent years, important progress is made in generalized semi-Markov process simulation method, which is applied to stochastic neutron kinetic process simulation. It reveals inherent law of neutron initiation experiments conducted in pulse reactor. At last, research topics to be solved in stochastic neutron dynamics are discussed. Reference | Related Articles | Metrics

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Discontinuous Finite Element Methods for Solving Hydrodynamic Equations YU Xi-jun, ZHOU Tie CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2005, 22 (2): 108-116.   Abstract （768）      PDF （509KB）（3233）       Knowledge map    The discontinuous finite element method with first, second and third order accuracy on triangular meshes on two-dimensional domain is applied to simulate hydrodynamic equations. The calculation results are compared with those from difference methods. It is reckoned that the discontinuous finite element method has advantages in solving hydrodynamic problems with complicated boundary conditions or a domain with a complicated boundary. Related Articles | Metrics

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Combined Compact Upwind Difference Schemes for Navier-Stokes Equations LIANG Xian, TIAN Zhenfu CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2008, 25 (6): 659-667.   Abstract （372）      PDF （428KB）（3232）       Knowledge map    A fourth-order combined compact upwind (CCU) finite difference scheme with high resolving efficiency is proposed. A high-order compact difference algorithm for Navier-Stokes (NS) equations based on projection method is developed with CCU scheme on staggered grids. Convection terms are discretized by CCU scheme. Viscous terms, pressure gradient terms and pressure Poisson equations are discretized with fourth-order compact symmetric finite difference schemes. Numerical examples validate capability of the proposed approach. It is shown that the method is accurate and robust, and is applicable to complex fluid flows. Related Articles | Metrics

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Radial Basis Function Interpolation in Moving Mesh Technique LIN Yanzhong, CHEN Bing, XU Xu CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2012, 29 (2): 191-197.   Abstract （488）      PDF （6186KB）（3217）       Knowledge map    A spring stream method used for unstructured grid and a transfinite interpolation method used for structured grid are discussed.A method using radial basis function is proposed,which resolves moving mesh problem without any grid-connectivity information.Corresponding mesh numerical program is developed.Rotation of a two-dimensional rhombic aerofoil and deformation of a three-dimensional F104 aerofoil are taken as examples to show effects of function and radius on mesh quality and numerical efficiency.Results are compared with mesh-deformation using lineal spring method.It validats availability of the RBF method.We concluded that the RBF method is remarked with simple data structure,high numerical efficiency and strong adapting ability for large mesh deformation.It could be applied to CFD dynamic mesh problems. Related Articles | Metrics

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Hybrid Particle-in-Cell/Fluid Model for Hot Electron Transport in Dense Plasmas XU Han, ZHUO Hongbin, YANG Xiaohu, HOU Yong, YIN Yan, LIU Jie CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2017, 34 (5): 505-525.   Abstract （625）   HTML （16）    PDF （2828KB）（3083）       Knowledge map    One of key issues in high energy density physics is clarification of transport and energy deposition of laser-produced fast electrons traveled through dense plasma. However, modeling these systems numerically is still a great challenge. In this paper, we introduce a PIC/fluid hybrid model. In this hybrid method, fast electrons are modeled by a relativistic Fokker-Planck equation, which numerically solved by reducing it to equivalent stochastic differential equations. Background electrons and ions are treated as two-fluid model. Collisions, electric and magnetic fields, and evolutions of resistivity due to heating of background are included. Treatment is valid for fast electron number densities much less than that of background, fast electron energies much greater than background temperature, and time scales short enough that magnetic diffusion and thermal conduction can be negligible. Model of ionization and resistivity also determine validity of the model. Reference | Related Articles | Metrics

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SMOOTHED PARTICLE HYDRODYNAMICS (SPH) METHOD (A REVIEW) Zhang Suochun CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    1996, 13 (4): 385-397.   Abstract （582）      PDF （435KB）（3024）       Knowledge map    This paper describes a new and pure Lagrangian method——called "Smoothed Particle Hy drodynamics" (SPH) method. The method is to actually evaluate spatial gradients without the use of any grid. Thus it does not suffer form the severe problems always associated with mesh tangling and distortion. Therefore it can be applied to multidimensional hydrodynamics which could effectively model three-dimensional systems which lack symmetry and possess large voids. At first, the paper gives an introduction to theoretical basis to SPH. Emphasis is given to a proper derivation of the SPH equations from the hydrodynamical conservation equations. Discussion covers some relative problems such as artifical viscosity, thermal conduction, self-gravity and sink and magnetic fields, choosing the smoothing kernels, and implementation of SPH code, etc. Related Articles | Metrics

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Structural,Electronic,and Magnetic Properties of Mn-doped ZnS (110) Surfaces:First-principles Study SONG Dewang, NIU Yuan, XIAO Liou, LI Dan CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2012, 29 (2): 277-284.   Abstract （423）      PDF （6406KB）（2872）       Knowledge map    Structural,electronic,and magnetic properties of Mn-doped ZnS (110) surfaces are investigated with first-principles method.Geometric parameters,formation energies,magnetic moments,density of states,and electron charge densities are studied.It shows that the lowest formation energy is as a Mn atom doped into the second layer,which indicates that this layer is more stable for Mn-doping.For bidoped case,the most stable configuration is an antiferromagnetic state of two Mn atoms.Total magnetic moments is equal to that of a free Mn atom.The local magnetic moment of Mn atom depends on a hybridization of Mn 3d state and its neighboring S 3p state,that is to say,magnetic moment changes as environment of S atoms alters.Furthermore,electron charge density shows that intensity of covalent bond between Mn and S atoms is greater than that between Zn and S atoms. Related Articles | Metrics

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Different Forms of Nonlinear Schrödinger Equation and Solutions Using Split Step Fourier Method LÜ Lixiang, ZHANG Xiaoping CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2007, 24 (3): 373-377.   Abstract （724）      PDF （215KB）（2841）       Knowledge map    The positive and negative frequency expressions of quasi-monochromatic optical fields of a pulse in fiber-optic communication and the positive and negative frequency forms of Fourier transformations and nonlinear Schrödinger(NLS) equations are discussed.Especially,in the solution of pulse spectrum,the negative frequency form of NLS equation should be solved by the negative frequency form of Fourier transformation,while the positive frequency form of NLS equation is solved by the positive frequency form of Fourier transformation.An example is given using split step Fourier method. Related Articles | Metrics

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An Integrated High-throughput Computational Material Platform YANG Xiaoyu, WANG Juan, REN Jie, SONG Jianlong, WANG Zongguo, ZENG Zhi, ZHANG Xiaoli, HUANG Sunchao, ZHANG Ping, LIN Haiqing CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    2017, 34 (6): 697-704.   Abstract （910）   HTML （16）    PDF （2633KB）（2830）       Knowledge map    The core philosophy of Material Genome Initiative is transition of way of new material design from traditional "try-and-error" approach to in-silico material design approach where intensive computing and material informatics are employed. It aims to effectively speed up discovery, development, production and deployment of new material two times faster as it is now. It means a culture shift of new material discovery:simulation and prediction first, followed by experiment. An integrated computational material platform that can facilitate high-throughput quantum mechanical simulations and manage simulation lifecycle data is therefore vital. This paper depicts a high throughput computational material platform and software framework, namely, MatCloud, which effectively integrates individual quantum mechanical simulation tasks, data extraction and data storage into an automatic flow in an end-to-end manner without direct human control. Especially, core data curation activities are also integrated into this flow rather than happening at post-simulation stage separately. MatCloud is demonstrated in an example of disorder binary alloy design to be valid and effective. Reference | Related Articles | Metrics

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DISCRETE ORDINATE SOLUTIONS OF RADIATIVE TRANSFER EQUATION Liu Linhua, Yu Qizheng, Ruan Liming, Tan Heping CHINESE JOURNAL OF COMPUTATIONAL PHYSICS    1998, 15 (3): 337-342.   Abstract （422）      PDF （281KB）（2791）       Knowledge map    The discrete ordinate approximation method of three-dimensional radiative transfer equation in absorbing scattering medium is expounded. The selection of quadrature sets of in-scattering term are analysed. The causes about the formation of false scattering and ray effect and its influence on the accuracy of solutions are also analysed. By detailed comparison, it is shown that false scattering and ray effect exact not only in discrete-ordinates method, but also in zone method, discrete transfer method, etc., and the influence of false scattering and ray effect on solution accuracy of radiative transfer equation can be reduced by decreasing grid size and increasing the number of solid angle discretation. The process of radiative heat transfer in a three-dimension rectangular furnace is simulated using discrete ordinates method. By comparison with zone method and discrete transfer method, it is found that discrete ordinates method has a good accuracy, and recently is one of the best method to simulate the process of radiative heat transfer in furnace. Related Articles | Metrics