Witold Dzwinel

Macro-Scale Simulations Using Molecular Dynamics Method

Abstract In this paper a new approach to the simulation of shock phenomena is presented. The discrete model of matter description is applied. The system representing a physical object consists of a large number of mutually interacting “particles” (N ∼ 105 +). The model can be used as an alternative to the model of continuous medium described by the sets of partial differential equations solved numerically, using for example the finite elements method. For the presented method, the time evolution of the particle system is described by the Newtonian laws of motion. Application of this approach for simulation of stress and shock phenomena is discussed. The results of selected simulations of the penetration mechanics, explosion and squashing are presented.

An examination of long-rod penetration in micro-scale using particles

Abstract The authors show how using particle simulations one can try to solve the problems out of reach of classical models based on the matter, momenta and energy flows continuity. Being aware about limitations of the method applied, the paper presents the perspectives of particle based simulations considering as an example the penetration mechanism investigation in micro-scale.

The results and perspectives of the particles method approach in investigations of plastic deformations I. Penetration mechanism

Abstract In the paper the assumptions of the particles method are presented and adapted to macroscopic quasi-particles and quasi-potentials. The system representing a physical object consists of a large number of mutually interacting “particles” ( N ≈ 10 5 +). The model can be used as an alternative to the model of continuous medium described by the set of partial differential equations, usually solved by the finite elements method (FEM). The advantages and disadvantages of both approaches for the simulation of shocking phenomena are discussed. The unique character of the presented method for simulation of non-continuities of the matter under stress is exemplified by the preliminary results obtained for simulation of projectile and long rod penetration.

High Performance Simulation of Thermal Convection Using Quasi-particle Approach

Despite its simplicity, the new model allows to obtain convection patterns easily. Among possible future changes the usage of granular dynamics with contact interactions and improved model for changing of particle properties due to the interactions with neighbours, seem to be most promising.