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Discrete Element simulation Discrete Element Method (DEM) is a dynamic simulation method for solid frictional particles, firstly proposed by Cundall (1971). Recent progress in computer ability makes it possible to perform DEM simulation with larger number of particles (1,000,000,000 particles at maximum with Earth simulator) and to apply it to various engineering fields.   In DEM each particle moves according to the equation of motion, which is solved in an explicit time marching scheme such as leap-frop method. Its algorithm is quite similar to Molecular Dynamics (MD) simulation except the particle interaction model; contact force between particles is modeled with spring-dashpot-slider system in DEM.  In order to obtain a simulation result quantitatively comparable to experimental one, it is necessary to precisely model the particle characteristics such as size, shape, elasticity, plasticity, crushability and so on. Among them, we focus on particle shape modeling for natural, irregularly-shaped grains such as sands and gravels. Recently we developed an efficient modeling method that enables us to quantitatively simulate the mechanical constitutive behavior of a particular sand if its grain shape characteristics are statistically known.    2005 poster (2) (in Japanese, pdf) DEM公開プログラム |
