Description:material science, discrete element method.
Abstract:The development of the appropriate theoretical framework as well as numerical research tools for prediction of constitutive behaviour with respect to microstructure belongs to major problems of computational sciences. In general, the macroscopic material behaviour is predefined by the structure of grains of various size and shape, or even by individual molecules or atoms. Motion and inter-action of them has to be taken into account to achieve a high degree of accuracy. The discrete element method (DEM) is an attractive candidate to be applied for modelling of granular flows, nano-powders and other materials on microscopic level. It belongs to the family of numerical methods and refers to conceptual framework on the basis of which appropriate models, algorithms and computational technologies are derived. The main disadvantages of the DEM technique, in comparison with the well-known continuum methods, are related to computational capabilities which are limited by a huge number of particles and a short time interval of simulations. The small time step imposed in the explicit time integration schemes gives rise to the requirement that a very large number of time increments should be performed. Naturally, for the solution of industrial-scale problems, distributed computing and GRID technologies becomes an obvious option for significantly increasing computational capabilities. The increased role of inter-disciplinary co-operation and development of new technologies may be also qualified to major factors driving the progress of the DEM models and countless applications. A lot of challenging scientific and industrial problems has been solving by developed DEMMAT_PAR code. The most interesting examples include actual problems such as nano-powders, compacting, mixing, hopper discharge and crack propagation in building constructions.
DEMEMAT_PAR code is parallel. Code is written using Fortran 90 language, MPI library is included. Minimal requirement for the processor is Intel Pentium