DEMMAT code for numerical simulation of multi-particle systems dynamics. Information technology and control

Abstract. The paper presents three versions of software codes for the simulation of granular material dynamics based on the discrete element method. The codes DEMMAT_F90 and DEMMAT_PAS are used for the imple-mentation of a purely procedural approach by the programming languages FORTRAN 90 and OBJECT PASCAL, while the code DEMMAT_CPP represents a purely object-oriented programming approach based on applying C++. 1. Indroduction Two programming concepts based on procedural and object-oriented programming (OOP) approaches may be implemented now through different program-ming languages. By using a procedural approach, the problem is decomposed into several composite algo-rithms which are implemented as their subroutines or functions, while all the data related to particles is kept in separate arrays. To extend functionality, new sub-routines or functions are required in a code, which can make it large and complicated. At the same time, any changes of the code require some additional time i