The 3-D mathematical model of the electromagnetic field’s radiation generation is represented. The problem of electromagnetic field calculation in the electron flux is briefly described. The flux is formed during the medium ionization by photons. Ionizing and elastic interactions between electrons and medium are taken into account. The numerical algorithm, which negotiates particles method on heterogeneous finite-difference grid, is represented. The main principles of parallel programs for numerical algorithms implementation are formulated. Some characteristics for parallelization efficiency demonstration are adduced.

Mathematical modelling in actual problems of science and technics