THE NUMERICAL CALCULATION OF THE IMPURITY CONCENTRATION IN THE ATMOSPHERE USING THE DIFFERENCE SCHEMES OF HIGH ORDER OF ACCURACY AND COMPUTER TECHNOLOGY
In this paper we consider the problem of pollutant transport, which is described by advection-diffusion equations modeling the transport of gaseous impurities in a given stream. For the numerical solution of this problem using finite difference schemes: upwind scheme, the scheme MLU Van Lear, the scheme and the scheme of Bott ENO. Theoretically it proved that the constructed difference schemes approximate the differential problem on the exact solution, relatively stable and converge. In addition, the model for two-dimensional problems of the distribution of impurities that have analytical solutions, numerical tests of difference schemes. On the basis of comparative analysis found that the minimal effect of viscosity on the circuit have the numerical solution schemes used to approximate advection equations members approach the high (> 1) order of accuracy (Bott scheme and the scheme of ENO).