Archive

25 December 1990, Volume 7 Issue 4 Previous Issue    Next Issue

---

For Selected:

Download Citations EndNote Ris BibTeX

Toggle Thumbnails

Select

A THREE DIMENSIONAL MODEL OF TIDE AND ITS APPLICATIONS Xu Shurong, He Yongzhong, Xia Zongwan 1990, 7(4): 385-395.  Abstract ( )   PDF (546KB) ( )   In this paper based on the method proposed by Backhaus[1], we give a three dimensional model of tide with "topographic net parameter". And then we applied it to computing some examples included astronomy tide and storm tide. Numerical results show that they accord with measure data.

Select

THE NUMERICAL SIMULATION FOR TURBULENT TRANSONIC FLOW OVER AIRFOILS Li Feng, Wang Yiyun 1990, 7(4): 396-402.  Abstract ( )   PDF (361KB) ( )   In this paper, LU-ADI scheme and Baldwin-Lomax turbulent model were applied to simulate turbulent transonic flow around twodimensional airfoils. By a series of numerical experiments, it is proven that the method used in this paper is successful and the numerical results are satisfactory.

Select

THE MCDF PACKAGE AND RELATIVISTIC CALCULATIONS OF ELECTRIC DIPOLE RADIATIVE TRANSITION PROBABILITY Zhu Qiren, Pan Shoufu 1990, 7(4): 403-406.  Abstract ( )   PDF (285KB) ( )   The program for computing atomic electric dipole radiative transition probability has been written in Coulomb gauge and length gauge by using the program source ready in original MCDF package, based on the general theory of relativistic radiative transition, It has considered configuration interaction and orbital relaxation effects in the transitions.

Select

NUMERICAL EXPERIMENTS ON THE COMPUTATIONAL EFFICIENCY OF POINT-PCG AND BLOCK-PCG METHODS Lei Guangyao 1990, 7(4): 407-414.  Abstract ( )   PDF (486KB) ( )   Using the method of the element order in matrices, high order approximate LU decompositions are used as the preconditioners for the computation of different experiments. High order approximate inverses are also adopted for the approximate block LU decomposition in the computation of the block-PCG for same experiments. The results show that the point-PCG of order P has a higher convergence rate than the block-PCG of order P when P=2.3,…,6. The total computational cost of the point-PCG is less than the block-PCG of Ihe same order. This illustates that the point-PCG of the P-order approximate LU decomposition is more efficient than the block-PCG of the P-order approximate inverse when the order P varies in the scope considered.

Select

AN OPERATOR-SPLITING METHOD FOR NUMERICAL MODELLING OFTRANSPORTATION PROBLEM Chen Chuping, Y. S. Li 1990, 7(4): 415-423.  Abstract ( )   PDF (510KB) ( )   An operotor-spliting method for the two-dimensional transport equation is developed. In the convection phase, a Galerkin weighted residual approach is employed to minimize the error generated by interpolation. Computer execution time is reduced by adopting Simpson's rule for some of the numerical integrations and by using an iteration stategy in the dispersion phase, thus avoiding the matrix inversion procedure in each time step. Several numerical examples are presented. The numerical results are coincident with the exact analytical solutions.

Select

COMPUTATION OF THREE-DIMENSIONALNATURAL CONVECTION OF WATERUSING VECTOR POTENTIAL ANDVORTISITY EQUATIONS Jiang Jinliang 1990, 7(4): 424-430.  Abstract ( )   PDF (455KB) ( )   At first, the three-dimensional vector potential and vorticity function are introduced, and the vector potential and vorticity equations are obtained in the case of arbitrary variation between density and temperature of water. Then, the vector potential and vorticity equations and the method of the false transient are applied to compute the three-dimensional viscous natural convection. Finaly, the effect of the property of unusual variation between density and temperature of water on three-dimensional natural convection is analysed and discussed by use of typical examples.

Select

CALCULATION OF H2O GROUND STATE BY THE ELECTRON CLOUD DISPLACEMENT MODEL Pan Zhongcheng, Liu Jingjiang, Wang Jian 1990, 7(4): 431-433.  Abstract ( )   PDF (204KB) ( )   Based on the electron cloud displacement model (the atomic orbits of H and O were displaced), the total energy of H2O molecule is calculated by an initial method with STO-3G. The improved result is obtained.

Select

CALCULATIONS OF WATER HAMMER FOR MULTI-PIPING BRANCH SYSTEM BY VARIABLE TIME STEP METHOD Han Qingshu 1990, 7(4): 434-442.  Abstract ( )   PDF (405KB) ( )   The results of water hammer for multi-piping system is presented the water hammer in complicated pipes has been computed by characteristic line-method. To improve the accuracy of numerical calculations, Variable step with multipipes are used. So the computational work are greatly reduced. Some computable results are satisfactory. It will provide the foundation to choose plan for piping desin and piping protection.

Select

NUMERICAL ANALYSIS OF THE PROPAGATION CHARACTERS OF THE SINGLE-MODE TAPER FIBER Yuan Libo, Lu Chaohui 1990, 7(4): 443-447.  Abstract ( )   PDF (262KB) ( )   A Scalar wave equation with an aix direction variate z is used to describe a single-mode taper fiber, and the scalar wave equation is changed to one-order differential equations group by a Simple transform. The quartic Runge-kutta Method improved by Gill is used to Calculate the propagation Characters of a Single-mode taper fiber.

Select

ELECTRON ENERGY DISTRIBUTIONS OF DIRECT-CURRENT ARGON DISCHARGES AT LOW PRESSURES Wang Dezhen, Liu Yue, Ma Tengcai 1990, 7(4): 448-452.  Abstract ( )   PDF (287KB) ( )   Electron energy distributions of direct-curent argon discharges at low pressures were calculated by numerically solving the homogeneous Baltzmann equation. The calculations cover the whole range of low electron densities to sufficiently high electron densities. Typical values of the ratios of the electric field to the gas density in this work are in the renges of 10-16 < E/N < 10-15 Vcm2. The influence of electron-electron collisions and the electric field on the electron energy distribution function was studied.

Select

NEW INTERPOLATION FORMULA IN ALGEBRAIC MULTIGRID METHOD Chang Qianshun, Li Zhengfeng 1990, 7(4): 453-460.  Abstract ( )   PDF (456KB) ( )   In this paper, we present a new interpolation formula of algebraic multigrid (AM G). The AMG algorithm with this formula can solve many problems, even very ill-conditioned problems like biharmonic equation and convection-diffusion equation with discontinuous coefficient etc. The theoretical analysis and numerical experiments demonstrate that this formula is very robust and efficient, so we have extended the application range of AMG.

Select

THE ACCELERATION METHOD FOR NUMERICAL INVERSION OF LAPLACE TRANSFORMS Wang Qiu, Li Jianliang 1990, 7(4): 461-466.  Abstract ( )   PDF (314KB) ( )   Based on the computing of oscillatory integral. A class of recurrence serices for approximating inversion Laplace transform, is suggested with the acceleration methods for every serice. Then the extrapolation method is applied to these serie's sequence.

Select

CALCULATIONS OF ATOMIC STRUCTURE FOR ARBITRARY TEMPERATURE AND MATTER DENSITY Meng Xujun, Sun Yongsheng 1990, 7(4): 467-471.  Abstract ( )   PDF (303KB) ( )   Schrodinger wave equation is solved in TF Statistical potential including modification of electronic self-interaction for arbitrary temperature and matter density. In order to deal with relativistic effects on atom, relativistic mass-velocity correction, relativistic Darwin correction and spin-orbit coupling correction are introduced into the wave equation. Calculations are presented for Fe, Rb at a few temperature and various densities and comparison with more accurate one's is made in tables. The datas obtained by present method show our results may be compared even with one of relativistic HFS model.

Select

NUMERICAL SIMULATION OF SUPERSONIC VISCOUS FLOW ABOUT INDENTED NOSETIPS Xue Jukui, Wang Ruquan 1990, 7(4): 472-480.  Abstract ( )   PDF (483KB) ( )   Accourding to the thought of TVD, we propose the TVD-type second-order CSCM[1], from a siugle eqution, then extend it to system of equtions. To test the method and computer code, we compare our results for sphere with those of the reference [2]. Using our code, we simulate the supersonic viscous separated flow over indented nosetips. We compare the first-order results with the second-order results, and viscous results with inviscid results. Computational grids are generated by a simpler and faster quasi-orthogonal algebraic generation method.

Select

CALCULATION OF KINETIC THEORY ON ALFVEN SOLITONS IN COLLISIONAL PLASMAS Jian Guangde, Pan Chuanhong 1990, 7(4): 481-487.  Abstract ( )   PDF (369KB) ( )   The nonlinear complex parabolic partial differential equation is solived by the predictor-correction scheme. The numerical solutions are attained for the nonlinear propagration of ALFVEN wave-packet in collisional plasmas. The results show the effect of collision damping can not be neglected, whereas the nonlinear Landau damping is a weak effect compared with the collision one.

Select

RXY/DRXY-A POSTPROCESSING GRAPHICAL SYSTEM FOR SCIENTIFIC COMPUTATION Jin Qijie 1990, 7(4): 488-494.  Abstract ( )   PDF (464KB) ( )   Scientific computing require computer graphical function for its visualization. In the article we describe developing objects and functions of A postprocessing graphical system for scientific computation, and also briefly describe its implementation.

Select

ALADDIN ATOMIC AND MOLECULAR DATABASE Qiu Yubo, Liu Kuanming 1990, 7(4): 495-499.  Abstract ( )   PDF (322KB) ( )   ALADDIN ("A Labelled At.omic Data Interface")has been designed by R.A.Hulse. originally. The basic features of this system are introduced here. The system software, data files and dictionary files are described briefly. Finally we give an example to describe how to link the user 's code.