GNS Programming System. Fortran GNS Language Description

This paper is devoted to the Fortran GNS language intended for distributed memory architectures. Fortran GNS is based on Fortran 77 Standard and extended by task handling and message passing constructs. The set of added language features includes a new data type, a new kind of program unit, new statements and new intrinsic procedures. Syntax and semantics of all extensions are described in this document in detail. There are presented analytical solutions of the problem of diffusion of a magnetic field from the region between rails for a two-dimensional case. Motionless and moving contacts are considered. The results of numerical experiments on finding of an order of singularity of physical fields are presented. The solutions obtained allow one to explain a number of the results of both numerical calculations using a 2D code and actual experiments.