Three-dimensional discrete element simulations in hoppers and silos

Goda, Tibor; Ebert, Fritz

doi:10.1016/j.powtec.2005.04.019

Cited by 86 publications

(35 citation statements)

References 9 publications

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“…The static force describes friction prior to gross sliding and comprises elastic and viscous ingredients, while the dynamic force describes friction after gross sliding and is expressed by the Coulomb's law. For evaluating the contact forces (3)(4), all contacts between the particles and their neighbours should be detected. A cell-based method is used for contact detection [18].…”

Section: Mathematical Model Of the Discrete Element Methodsmentioning

confidence: 99%

“…The conducted research is mainly focused on several aspects as follows: wall pressure, discharge rate and internal properties. The study of the bulk material pressure on the walls of a hopper plays a very important role in hopper design [3]. The prediction of the discharge rate is important for effective operation and control of the transport system [4].…”

Section: Introductionmentioning

confidence: 99%

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The comparison of two domain repartitioning methods used for parallel discrete element computations of the hopper discharge

Markauskas

Kačeniauskas

2015

Advances in Engineering Software

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Section: Mathematical Model Of the Discrete Element Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The comparison of two domain repartitioning methods used for parallel discrete element computations of the hopper discharge

Markauskas

Kačeniauskas

2015

Advances in Engineering Software

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“…The Rayleigh time is taken by an energy wave to transverse the smallest element in the particular system. Time step must be so short, that the disturbance of particle's motion could only propagate to the nearest neighbors [20,35,36]. The final time step value was Δt = 4.21·10 -5 s. The grid size in all simulation was 2.5R min , where R min is the minimal radius of particles.…”

Section: The Simulation Processmentioning

confidence: 99%

Extension of silo discharge model based on discrete element method

Oldal

Safranyik

2015

J Mech Sci Technol

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Silos are containers used by almost all fields of industry for storing granular materials and generally classified in two types: mass flow and funnel flow. One of the most important design parameter of these equipment is the discharge rate which depends on the flow mode. There are high numbers of analytical and empirical models used for determine this parameter, however none of them is suitable for both flow modes; moreover the accuracy of mass flow models is not acceptable. Recently a few numerical discharge models are made for certain geometries; but the applicability of these models in case of different flow modes was not examined. Aim of our work is the creation of an experimentally validated numerical discharge model based on others work and examination of this in term of different flow modes. We prove that our modified model is suitable for determine silos discharge rate independently from flow mode.

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“…Finally, the minimal and maximal radii of particles, needed for generation of the particles using the assumed distribution is found from expressions (6) and (7) by multiplying the average radius of particle by k 1 and k 2 . The following values of these ratios were assumed: k 1 = 1.134, k 2 = 0.851.…”

Section: Simulation Setupmentioning

confidence: 99%

DEM Analysis of Effect of the Particle Size During the Material Flow in Wedge-Shaped Hopper

Balevičius¹,

Kačianauskas²

2008

ISARC 2008 - Proceedings From the 25th International Symposium on Automation and Robotics in Construction

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The current analysis was mainly focused to the study of the strained physical effects arising from a decrease of the particles number. The main aspects concerning programming concepts as well as languages having influence on the computer time of simulations is also presented. The limitation in the particles amount was adopted by increasing the particle radii to keep constant the total mass of granular material. In this way, the performed computer simulations of the filling and discharge in three-dimensional hopper using 1980, 10000 and 20400 number of particles were shown that the decrease in particles number with increasing the particle radii produces an artificial friction due to material homogeneity. This is results in the decreased mass fraction and its rate during discharge causing the longest time for the full material discharge; the decreased normal and increased shear pressure of walls. KEYWORDSDiscrete element method, programming concepts, material heterogeneity, wedge shaped three-dimensional hopper

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Three-dimensional discrete element simulations in hoppers and silos

Cited by 86 publications

References 9 publications

The comparison of two domain repartitioning methods used for parallel discrete element computations of the hopper discharge

The comparison of two domain repartitioning methods used for parallel discrete element computations of the hopper discharge

Extension of silo discharge model based on discrete element method

DEM Analysis of Effect of the Particle Size During the Material Flow in Wedge-Shaped Hopper

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