GRANULAR MEDIA ON A VIBRATING PLATE: A MOLECULAR DYNAMICS SIMULATION

1993 ◽  
Vol 07 (09n10) ◽  
pp. 1779-1788 ◽  
Author(s):  
JASON A.C. GALLAS ◽  
HANS J. HERRMANN ◽  
STEFAN SOKOLOWSKI
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Granular Materials ◽  
Granular Medium ◽  
Granular Media ◽  
Dynamics Simulation ◽  
Dissipation Of Energy ◽  
Conveyor Belts ◽  
Good Agreement ◽  
Vibrating Plate

When sand or other granular materials are shaken, poured or sheared many intriguing phenomena can be observed. We will model the granular medium by a packing of elastic spheres and simulate it via Molecular Dynamics. Dissipation of energy and shear friction at collisions are included. The onset of fluidization can be determined and is in good agreement with experiments. On a vibrating plate we observe the formation of convection cells due to walls or amplitude modulations. Density and velocity profiles on conveyor belts are measured and the influence of an obstacle discussed. We mention various types of rheology for flow down an inclined chute or through a pipe and outflowing containers.

MOLECULAR DYNAMICS SIMULATIONS OF GRANULAR MATERIALS

1993 ◽  
Vol 04 (02) ◽  
pp. 309-316 ◽  
Author(s):  
HANS J. HERRMANN
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Granular Materials ◽  
Granular Medium ◽  
Velocity Profiles ◽  
Dissipation Of Energy ◽  
Shear Friction ◽  
Conveyor Belts ◽  
Dynamics Simulations ◽  
Good Agreement

When sand or other granular materials are shaken, poured or sheared many intriguing phenomena can be observed. We will model the granular medium by a packing of elastic spheres and simulate it via Molecular Dynamics. Dissipation of energy and shear friction at collisions are included. The onset of fluidization can be determined and is in good agreement with experiments. On a vibrating plate we observe the formation of convection cells due to walls or amplitude modulations. Density and velocity profiles on conveyor belts are measured and the influence of an obstacle discussed. We mention various types of rheology for flow down an inclined chute or through a pipe and outflowing containers.

scholarly journals The structural and dynamical properties of aluminosilicate melts: Insight via molecular dynamic simulation

2021 ◽  
Vol 2070 (1) ◽  
pp. 012064
Author(s):  
Mai Van Dung ◽  
Tran Thanh Dung ◽  
Truong Duc Quynh ◽  
Nguyen Manh Tuan ◽  
Nguyen Van Yen ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Distribution Function ◽  
Molecular Dynamics Simulation ◽  
Dynamic Simulation ◽  
Simulated Data ◽  
Dynamics Simulation ◽  
Dynamical Heterogeneity ◽  
Dynamical Characteristics ◽  
Dynamical Properties ◽  
Good Agreement

Abstract We have studied the structural and dynamical characteristics of xAl2O3(1-x)SiO2 system by means of molecular dynamics simulation at 3000 K using the Born-Mayer potentials. The structural properties have been analysed through the radial distribution function and structural factor. The simulation shows that our results are in good agreement with previous experimental and simulated data. The dynamical heterogeneity (DH) is investigated via the analysis of mobile, immobile, and random atoms. Our simulation indicates that the liquids exists dynamical heterogeneity.

scholarly journals Movement pattern of an ellipsoidal nanoparticle confined between solid surfaces: Theoretical model and molecular dynamics simulation

Friction ◽  
2020 ◽  
Author(s):  
Junqin Shi ◽  
Xiangzheng Zhu ◽  
Kun Sun ◽  
Liang Fang
Keyword(s):  
Molecular Dynamics ◽  
Theoretical Model ◽  
Molecular Dynamics Simulation ◽  
Movement Pattern ◽  
Axial Ratio ◽  
Surface Damage ◽  
Solid Surfaces ◽  
Dynamics Simulation ◽  
Copper Surfaces ◽  
Good Agreement

Abstract The movement pattern of ellipsoidal nanoparticles confined between copper surfaces was examined using a theoretical model and molecular dynamics simulation. Initially, we developed a theoretical model of movement patterns for hard ellipsoidal nanoparticles. Subsequently, the simulation indicated that there are critical values for increasing the axial ratio, driving velocity of the contact surface, and lowering normal loads (i.e., 0.83, 15 m/s, and 100 nN under the respective conditions), which in turn change the movement pattern of nanoparticles from sliding to rolling. Based on the comparison between the ratio of arm of force (e/h) and coefficient of friction (μ) the theoretical model was in good agreement with the simulations and accurately predicted the movement pattern of ellipsoidal nanoparticles. The sliding of the ellipsoidal nanoparticles led to severe surface damage. However, rolling separated the contact surfaces and thereby reduced friction and wear.

scholarly journals Molecular dynamics simulation of nonlinear waves in granular media

2015 ◽  
Author(s):  
J. Yang ◽  
D. A. Hutchins ◽  
O. Akanji ◽  
P. J. Thomas ◽  
L. A. J. Davis ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Nonlinear Waves ◽  
Granular Media ◽  
Dynamics Simulation

scholarly journals Распыление вольфрама ионами бериллия и неона

2020 ◽  
Vol 46 (24) ◽  
pp. 19
Author(s):  
Д.С. Мелузова ◽  
П.Ю. Бабенко ◽  
А.Н. Зиновьев ◽  
А.П. Шергин
Keyword(s):  
Experimental Data ◽  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Ion Bombardment ◽  
Dynamics Simulation ◽  
Tokamak Plasma ◽  
Universal Behavior ◽  
Sputtering Yields ◽  
Good Agreement ◽  
Near Threshold

Sputtering yields for tungsten under Be and Ne ion bombardment as well as angular dependencies of the sputtering yields were calculated using molecular dynamics simulation. The results for Ne are in good agreement with experimental data. The obtained results for Be-W sputtering are needed to calculate the impurity influx into the plasma when the divertor material - tungsten - is bombarded with Be ions in ITER tokamak plasma. A model that explains the universal behavior of near-threshold sputtering yields for light ion-induced sputtering of tungsten was proposed.

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