Abstract
Discrete Element Method (DEM) is one of available numerical methods to compute movement of particles in large scale simulations. The method has been frequently applied to simulate the cases of grain or bulk material as the major research issue. The paper describes a new method of generating high dense packing with mixed material of two different shape used in DEM simulation. The initial packing is an important parameter to control, because have influence on the first few seconds after start the simulation. Some-times when the material in silo is arranged with loose packing before the start, the particles move downward gravity. These changes between the start and the first few seconds in simulations act strongly on the results at the end of a discharging process in silo. At the initial simulation time it is important to prepare proper packing with mixed material, in order to make sure that the particles will not move due to gravity action. This solution is a necessary step to integrate in the simulation procedure in order to compare later the computer simulation with experimental measurements of material discharge in a silo.
Highlights
In many cases in order to validate a number of constructions and check a proper technology or construction simulations are prepared
One algorithm helped in large scale simulations, applying tetrahedral mesh which can be generated by other software: Ghs3D, Gmsh or Netgen[11, 12]
Generation of a mixed material in one simulation with high dense packing is impossible with methods described earlier
Summary
In many cases in order to validate a number of constructions and check a proper technology or construction simulations are prepared. The second one is used to deal with motion, dynamics of small particles in large scale simulations This method is addressed to prepare flow granular material or particle mechanics for many of problems especially for discharging process in silos. The free software such like YADE [4] or WooDEM, was created by scientists who work on granular flow This frameworks explore methods to generate spherical or ellipsoid packing[5, 6]. One algorithm helped in large scale simulations, applying tetrahedral mesh which can be generated by other software: Ghs3D, Gmsh or Netgen[11, 12]. Another algorithm firstly creates particles at random, starts the compression[13]. The basic method of sphere packing was called Face Centered Cubic(FCC) and Hexagonal Close Packing (HCP)[14]
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