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• pdf  512.041kb doc 512.041kb Views: 2171 Date: 22.12.2010
  Semenchin Y. A. Vandina N. V.

  THE ANALISIS OF SAINT-VENANT EQUATION SYSYEM ANALYTICAL AND NUMERICAL METHODS

  01.00.00 Physical-mathematical sciences

  Tags: sweep method fission method flow discharge saint-venant equation system diffusion-convection equation
  Description

  Diffusion-convection equation that has been received from Saint-Venant differential equation system describing nonstationary fluid motion in a river canal is investigated. Analytical method is considered for the solution of equation with the fixed factors and finite-difference method is considered for the solution of equation system with the float factors. The results of test calculations executed for a reaches of the river Kuban are presented

• pdf  150.456kb doc 150.456kb Views: 2125 Date: 28.10.2010
  Semenchin Y. A. Kuzyakina M. V.

  A TECHNIQUE FOR COMPUTING OF THE TURBULENT DIFFUSION COEFFICIENT VERTICAL COMPONENT

  01.00.00 Physical-mathematical sciences

  Tags: the turbulent diffusion coefficient vertical component admixture concentration filtration
  Description

  The technique for computing of the turbulent diffusion coefficient vertical component in the context of a mathematical model of admixture dispersion in the surface layer is proposed

• pdf  191.752kb doc 191.752kb Views: 2117 Date: 30.03.2011
  Semenchin Y. A. Laipanova Z. M.

  ABOUT A CORRECTNESS OF THE PROBLEM OF DESCRIBING DISPERSION OF AN IMPURITY IN TURBULENT ATMOSPHERE

  01.00.00 Physical-mathematical sciences

  Tags: diffusion singularity of solution koshi’s problem correctness beginning-edged problems solution stability fundamental decision of equation
  Description

  The review of resolvability of the beginning-boundary problem describing dispersion of an impurity in turbulent atmosphere, correctness of mathematical models, describing impurity dispersion in atmosphere and Koshi’s problem, the first right problem, the third right problem is given in the article

• pdf  142.912kb doc 142.912kb Views: 1976 Date: 29.06.2010
  Semenchin Y. A. Zakharov M. Y.

  CONSTRUCTING THE APPROXIMATE SOLU-TION OF THE TWO-DIMENSIONAL PROBLEM FOR THE EQUATION OF DIFFUSION WITH DEPENDING ON CONCENTRATION COEFFI-CIENTS AND SOURCE FUNCTION

  01.00.00 Physical-mathematical sciences

  Tags: the diffusion in the isotropic environment boundary problems with the nonlinear equations the method of basic potentials nonlinear source function
  Description

  In the article with the help of a technique, based on discretization initial problem of time variable and the method of basic potentials, is constructed the approximate solution of the second two-dimensional problem for the equation of diffusion with depending on concentration coefficients and source function. The general view of the approximate solution of this problem is reduced. On concrete example convergence of the approximate solution of the problem to the exact is shown