The discrete element method (DEM), with its core of using the so-called central difference method, involves actually iterative calculations. During the DEM calculations, the determinations of a reasonable computation time step and the normal stiffness are very important. The determination of the time step is closely related to the stiffness, the mass and the damping of the granule in question, and to their matching relationship. To decide the stiffness is so far through actual measurements. However, it can be done only in some special conditions and it needs a wealth of experience for the simulation results to be close to the practical results. This paper, based on the theoretical consideration and numerical simulations of a mass-spring system, proposes optional ways to determine the calculation time step and the normal stiffness.
YAN Min
,
GUO Zhen
. Stiffness Simulation Method of Determining Step Size Using Discrete Element Method[J]. Science & Technology Review, 2014
, 32(13)
: 33
-35
.
DOI: 10.3981/j.issn.1000-7857.2014.13.005
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