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25 March 1986, Volume 3 Issue 1 Previous Issue    Next Issue

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THE DETERMINATION OF DENSITIES AND VELOCITIES FOR UNIFORM LAYERED MEDIA Wang Tian-wei, Xue Xing-heng, Liu Ru-xun, Li Yi-shen 1986, 3(1): 1-13.  Abstract ( )   PDF (650KB) ( )   We consider the effect of the impinging of a plane wave on a surface of a stratified media at two different angles of incidence. The Goupillaud's equal-traveltime layer model and it's exact inverse formulas[1] are used, the time sequence of the video impedances can be computed.In order to compute the deepness distribution of the densities and velocities for the layered media, we propose in this paper "The contrast method of the layer-interfaces", by which, the computational experiments were made and the numerical results are satisfactory.

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ELECTRONIC STRUCTURE OF THE TRANSITION METAL ATOMS AS STUDIED BY MANY-BODY PERTURBATION THEORY Wang Liang-sheng 1986, 3(1): 14-22.  Abstract ( )   PDF (534KB) ( )   Many-body perturbation theory is employed in a study of the electronic structure of the transition metal atoms through second-onder in the energy. The basis sets consist of STO[8s6p4d1f]. The agreement with experiment is good for Cr atom.

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COMPUTATIONAL SIMULATION OF THE SURFACE GRAVITY WAVE AND THE FORCE ACTING ON A FLAT PLATE AFTER ITS IMPACT ON A WAFER SURFACE Chen Yao-Song, Kuo Dong-jian 1986, 3(1): 23-30.  Abstract ( )   PDF (417KB) ( )   The phenomena caused by the impact of a free falling flat plate on a water surface are investigated numerically. The computational method designed Shows its versatile ability for simulating the transient surface gravity wave propagation as well as the time varying force acting on the flat plate.

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THE AERODYNAMIC PERFORMANCE COMPUTATION OF WINGS USING TRANSONIC FULL POTENTIAL EQUATION Chen Ze-lin 1986, 3(1): 31-34.  Abstract ( )   PDF (235KB) ( )   A finite-difference relaxation method is used for numerical solution of consevative type 3-Dsteady full potential equation. Computations give the results for wing performance included surface pressure distribution, force and moment coefficients. In the computation, Joukowsky tranform,successive line over-relaxation (SLOR) scheme of Jameson and multigrid technique are used. Test runs for ONERA M6 wing coinside with satisfaction to other computational results and experimental data.

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THE NUMERAL CALCULATION OF THE CROSS SECTION IN THE COLLISION INTEGRAL Song Yu-hua, Zhao Yi-jun, Zhang zhi-jie 1986, 3(1): 35-46.  Abstract ( )   PDF (660KB) ( )   The critical and oscillating appearances ane the break of the integral limit which are encountered in the numeral calculation of the cross section are described and treated overally. The cross sections, collision integrals, and transport coefficients of noble-gases are calculated, according to the interactions of noblegas atoms by our method. The transport coefficients are compared with the experimental

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HIIGHER ORDER DIFFERENCE SCHEMES OF P01SSON EQUATIONS Luo Zhen-ou 1986, 3(1): 47-55.  Abstract ( )   PDF (435KB) ( )   Higher order accuracy difference schemes of Poisson equations have been discussed in this paper.The first scheme deals with Drichlet boundary condition, and the second one deals with Neumann boundary condition.The predictor-corrector procedure with α≲0.5 is proposed when the difference mesh is coarse.

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THE LIMITATION OF FIUX-LIMITED DIFFUSION THEORY AND ITS IMPROVEMENT Liu Cheng-an, Huang Wen-kai 1986, 3(1): 56-64.  Abstract ( )   PDF (471KB) ( )   The limitations of various typical flux-Limited diffusion theory and advantage of asymptotic diffusion theory with time absorption constant are analyzed and numerically compared. The conclusions are as follows. Though the flux-Limited problem in neutron diffusion theory are theoretically solved by means of derived flux-Limited diffusion equation, but it's going too far to limit flux due to the inappropriate of the assumption in deriving flux-limited diffusion equation. The asymptotic diffusion theory with time absorption constant has eliminated the above-mentioned limitation, so it is more accurate than flux-Limited diffusion theory in describing neutron transport problem.

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THE NUMERICAL SIMUATION TEMPERATURE FICLD OF GEOTHERMAL RESERVOLR IN MULTIPLE WELLS SYSTEM He Bo-Rong, Sun Che, Tian Chun-song, Li Feng-Zhong, Xiang Yang, Wei Chun yu 1986, 3(1): 65-76.  Abstract ( )   PDF (605KB) ( )   In this paper a mathematical model for the extraction-injection of geothermal reservoir in multiple wells is developed, It silplidies a complicated tridimentionsl heat conduction problem to a bi-dimentional one, The latter is a problem of coupling equations, one of wbich is a one-dimentional heat conduction equation in vertical, and another is a one-dimentional convection-conduction eqyation in horizontal, It deduces several different schemes for coupling solutions as the differential equations are discrtized, and discusses the procecdure of computation, We have prepard the software for drwing the groundwater has been exploited with double wells, three wells and five wells.

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THE 2-DIMENSIONAL NUMERICAL SIMULATION OF FORMING OF SELF FORGING FRAGMENT Wu Sheng-chang, Chang Qian-shun, Feng Yan-ling, Mu Jun, Li Lu-yin, He Shun-lu 1986, 3(1): 77-85.  Abstract ( )   PDF (522KB) ( )   The process of forming of Self Forging Fragment (SFF for short) is a very complicated problem of explosion. Because of SFF is axisymmetric, 2-d imentional elastic-plastic mechnical equations are used to discribe this process. In solving these equations, we use integral definitions of the partial derivatives by M.L. Wilkins,and Lagrange quadrilateral grid.The shape of the SFF obtained from our 2-dimensional numerical simulation compares fairly with that in the high speed x-ray photogragh of the actural experimental process.

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INTERNAI EIECTROMAGNETIC PUISE PRODUCED BY THE PROMPT-γ PHOTONS IN THE CAVITY OF THE RECTANGIE Wang Taichun, Wang Yuzhi 1986, 3(1): 86-98.  Abstract ( )   PDF (687KB) ( )   In this paper, the internal electromagnetic pulses produced by the prompt-γ photons wore calculated by self-consistent and non-self-consistent mothod respectively in three dimension rectangle cavity of the matel. The computational results were analyzed. Under the condition that the electric field is weak and the cavity is small, the results obtained by self-consistent method coincide with the results by the non-self-consistent.

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AN EFFICIENT HIGHLY COMPOSITE FFT ALGORITHM Lu Xian-chi 1986, 3(1): 99-112.  Abstract ( )   PDF (737KB) ( )   In this paper some fundamental methods of fast Fourier transform (FFT) are mentioned with a highly composite twiddle factor FFT:algorithm discussed in particular. The computer program upon the algorithm with other measures, which can be used for both forward and backward Fourier transform of either complex or real sequence,has been shown to have remarkably faster transform speed, and so it will be useful in practical computational work.

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THE TWO-DEMENSIONAL ASSEMBLY CALCULATION WITH INTERFACE CURRENT METHOD Xu Xiu-fang, Yin Ban-gnud, Xue You-yi 1986, 3(1): 113-128.  Abstract ( )   PDF (777KB) ( )   This paper indroduces the two-dimensional assembly calculation by means of ICM-interface current method. The calculation not only works out the critical Value of assemblies, Keff, and the average flux,but also gives the spectral parameters under the condition of assembly homogenization.Two benchmark problems and some practical engineering problems were calculation with the ICM method, and the results from the calculations are in very goor agreement with the results published in foreign country and China by Monte Carlo method. The code can be used in Two-dimensional assembly calculation of Light-water reactors.