DEM Simulation in Effects of the Section Structure of Smooth Rigid Wheel on Dynaminc Mechanical Behavior of Lunar Soil Simulant

2011 ◽  
Vol 80-81 ◽  
pp. 580-584
Author(s):  
Gui Fen Zhou ◽  
Fang Liu ◽  
Rui Zhang ◽  
Shu Cai Xu ◽  
Ye Liang Hu ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Mechanical Behavior ◽  
Lunar Soil ◽  
Simulation System ◽  
Mechanical Behaviors ◽  
Dem Simulation ◽  
Convex Section ◽  
Simulation Results ◽  
Section Structure ◽  
Flat Section

The simulation system between smooth rigid wheel and lunar soil by Discrete Element Method (DEM) was established and validated. Three section structures of smooth rigid wheel, including flat, concave and convex structures were designed. The effects of these three different wheel section structures on dynamic mechanical behaviors of lunar soil simulant were simulated by PFC2D®. The simulation results indicated that the concave section structure of smooth rigid wheel has the best anti-sinkage ability, the convex section structure has the good anti-sinkage ability, and the flat section structure has the worst anti-sinkage ability.

Analysis and DEM Simulation on the Interaction Characteristics between Lunar Soil and Coring Drill

2013 ◽  
Vol 373-375 ◽  
pp. 65-71
Author(s):  
Xu Yan Hou ◽  
De Ming Zhao ◽  
Jin Sheng Cui ◽  
Ting Wu Tang ◽  
Qi Quan Quan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Discrete Element Method ◽  
Cutting Force ◽  
Lunar Soil ◽  
Dem Simulation ◽  
Rotary Cutting ◽  
Simulation Results ◽  
Cutting Model ◽  
Method Model ◽  
Interaction Characteristic

The interaction characteristic between lunar soil and coring drill is studied in this paper. According to the failure forms of lunar soil, the stress area is divided into two parts, central failure area and lateral failure area. The impacts of different drill parameters on cutting force are obtained by a rotary cutting model. And the process of lunar soil coring is simulated basing on a special built DEM (discrete element method) model, which accord to the special mechanical properties of lunar soil. By analyzing the simulation results, the correctness of the cutting model is proved.

Study of the Effect of Liquid on Mixing Process for Size-Type Binary Particulate Systems by DEM Simulation

2011 ◽  
Vol 317-319 ◽  
pp. 2047-2050
Author(s):  
Hong Li Gao ◽  
You Chuan Chen
Keyword(s):  
Discrete Element Method ◽  
Liquid Bridge ◽  
Discrete Element ◽  
Mixing Process ◽  
Dem Simulation ◽  
Segregation Process ◽  
Size Type ◽  
Simulation Results ◽  
Horizontal Drum ◽  
Particulate Systems

The discrete-element method(DEM) was employed to simulate the mixing and segregation process for size-type binary particulate systems in a rotating horizontal drum for dry particulate systems and wet particulate systems. The effect of interstitial liquid on the mixing and segregation process were studied. The simulation results showed that the liquid bridge between particles play an important role in mixing and segregation process, as a result, segregation may be mitigated and mixing may be enhanced. To assess the accuracy of the simulation result, some comparisons were made with the experimental results in the literature.

scholarly journals Analysis of the mixing of solid particles in the slant cone and ploughshare mixers via Discrete Element Method (DEM)

2021 ◽  
Author(s):  
Seyed-Meysam Seyed-Alian
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Solid Particles ◽  
Mixing Efficiency ◽  
Dem Simulation ◽  
Initial Loading ◽  
Positron Emission ◽  
Simulation Results ◽  
Fill Level ◽  
Element Method

Discrete element method (DEM) was employed to characterize the mixing of the solid particles in two different types of the powder blenders. In the first part of this study, DEM was used to investigate the effects of initial loading, drum speed, fill level, and agitator speed on the mixing efficiency of a slant cone mixer. DEM simulation results were in good agreement with the experimentally determined data, both qualitatively and quantitatively. In the second part of this study, DEM was employed to characterize the mixing of the solid particles in a Ploughshare mixer. To validate the model, the simulation results were compared to the positron emission particle tracking (PEPT) data reported in the literature. The validated DEM was then utilized to calculate the mixing index as a function of the initial loading, plough rotational speed, fill level, and particle size for a ploughshare mixer.

scholarly journals Analysis of the mixing of solid particles in the slant cone and ploughshare mixers via Discrete Element Method (DEM)

2021 ◽  
Author(s):  
Seyed-Meysam Seyed-Alian
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Solid Particles ◽  
Mixing Efficiency ◽  
Dem Simulation ◽  
Initial Loading ◽  
Positron Emission ◽  
Simulation Results ◽  
Fill Level ◽  
Element Method

Discrete element method (DEM) was employed to characterize the mixing of the solid particles in two different types of the powder blenders. In the first part of this study, DEM was used to investigate the effects of initial loading, drum speed, fill level, and agitator speed on the mixing efficiency of a slant cone mixer. DEM simulation results were in good agreement with the experimentally determined data, both qualitatively and quantitatively. In the second part of this study, DEM was employed to characterize the mixing of the solid particles in a Ploughshare mixer. To validate the model, the simulation results were compared to the positron emission particle tracking (PEPT) data reported in the literature. The validated DEM was then utilized to calculate the mixing index as a function of the initial loading, plough rotational speed, fill level, and particle size for a ploughshare mixer.

scholarly journals Computer simulation of flat geogrids based on Discrete Element Method (DEM)

2019 ◽  
Vol 265 ◽  
pp. 01002
Author(s):  
Andrei Moshenzhal
Keyword(s):  
Computer Simulation ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Material Structure ◽  
Dem Simulation ◽  
Simulation Results ◽  
Element Method ◽  
The Way

The article presents the way of modelling flat geogrids using the Discrete Element Method (DEM). Simulation of geogrids is performed on the base of EDEM® software produced by DEM Solutions Ltd. The Hertz-Mindlin model with bonds is used as a model of particles interaction. The presented method of geogrid simulation using EDEM® software has some peculiarities in the formation of material structure. We compared two types of geogrids with the same characteristics formed out of a variety of balls with different radii. This article provides the simulation results of geogrid testing by calculating the force causing 2% and 5% tension (elongation) of the material.

scholarly journals DEM Simulation of Spin Vibration Screening Process

2011 ◽  
Vol 2-3 ◽  
pp. 960-965
Author(s):  
Dong Sheng Li ◽  
Yi Qiong Du
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Motion Simulation ◽  
Screening Process ◽  
Dem Simulation ◽  
Simulation Results ◽  
Element Method

This paper focus on the motion simulation and visualization of the material particles in the operation of the spin vibration screening using DEM(Discrete Element Method). Based on analysis of the simulation results, some conclusions are made which provide the theory basis in order to design the screen parameters reasonably. Finally some experiments are carried out in order to verify the correctness of the simulation.

Transient Computational Fluid Dynamics/Discrete Element Method Simulation of Gas–Solid Flow in a Spouted Bed and Its Validation by High-Speed Imaging Experiment

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Ling Zhou ◽  
Lingjie Zhang ◽  
Weidong Shi ◽  
Ramesh Agarwal ◽  
Wei Li
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Discrete Element Method ◽  
Fluidized Bed ◽  
High Speed ◽  
Discrete Element ◽  
Bubble Shape ◽  
High Speed Imaging ◽  
Bed Height ◽  
Simulation Results

A coupled computational fluid dynamics (CFD)/discrete element method (DEM) is used to simulate the gas–solid two-phase flow in a laboratory-scale spouted fluidized bed. Transient experimental results in the spouted fluidized bed are obtained in a special test rig using the high-speed imaging technique. The computational domain of the quasi-three-dimensional (3D) spouted fluidized bed is simulated using the commercial CFD flow solver ANSYS-fluent. Hydrodynamic flow field is computed by solving the incompressible continuity and Navier–Stokes equations, while the motion of the solid particles is modeled by the Newtonian equations of motion. Thus, an Eulerian–Lagrangian approach is used to couple the hydrodynamics with the particle dynamics. The bed height, bubble shape, and static pressure are compared between the simulation and the experiment. At the initial stage of fluidization, the simulation results are in a very good agreement with the experimental results; the bed height and the bubble shape are almost identical. However, the bubble diameter and the height of the bed are slightly smaller than in the experimental measurements near the stage of bubble breakup. The simulation results with their experimental validation demonstrate that the CFD/DEM coupled method can be successfully used to simulate the transient gas–solid flow behavior in a fluidized bed which is not possible to simulate accurately using the granular approach of purely Euler simulation. This work should help in gaining deeper insight into the spouted fluidized bed behavior to determine best practices for further modeling and design of the industrial scale fluidized beds.

scholarly journals SIMULATION OF FRACTURE USING A MESH-DEPENDENT FRACTURE CRITERION IN THE DISCRETE ELEMENT METHOD

2018 ◽  
Vol 16 (1) ◽  
pp. 41 ◽  
Author(s):  
Andrey Dimaki ◽  
Evgeny Shilko ◽  
Sergey Psakhie ◽  
Valentin Popov
Keyword(s):  
Particle Size ◽  
Discrete Element Method ◽  
Mechanical Behavior ◽  
Fracture Criterion ◽  
Discrete Element ◽  
Macroscopic Behavior ◽  
Detachment Criterion ◽  
Discrete Element Methods ◽  
Adhesive Contacts ◽  
Fracture Processes

Recently, Pohrt and Popov have shown that for simulation of adhesive contacts a mesh dependent detachment criterion must be used to obtain the mesh-independent macroscopic behavior of the system. The same principle should be also applicable for the simulation of fracture processes in any method using finite discretization. In particular, in the Discrete Element Methods (DEM) the detachment criterion of particles should depend on the particle size. In the present paper, we analyze how the mesh dependent detachment criterion has to be introduced to guarantee the macroscopic invariance of mechanical behavior of a material. We find that it is possible to formulate the criterion which describes fracture both in tensile and shear experiments correctly.

scholarly journals Analysis of Inter-particle Contact Parameters of Garlic Cloves Using Discrete Element Method

2021 ◽  
Author(s):  
Donghyeok Park ◽  
Chun Gu Lee ◽  
Doee Yang ◽  
Daehyun Kim ◽  
Joon Yong Kim ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Prediction Equation ◽  
Angle Of Repose ◽  
Particle Model ◽  
Bulk Properties ◽  
Simulation Results ◽  
Contact Parameters ◽  
Number Of Particles ◽  
Residual Number

Abstract Purpose The discrete element method (DEM) can be used in agricultural fields such as crop sowing, harvesting, and crop transportation. Nevertheless, modeling complex crops as appropriately shaped particles remains challenging. The modeling of particles and the calibration of input parameters are important for simulating the realistic behaviors of particles using the DEM. Methods In this study, particle models representing the morphological characteristics and size deviations of garlic cloves were proposed. Additionally, the coefficients of friction were analyzed as the contact parameters of the particles based on the heap formation experiments and simultations of the swing-arm method using 150 garlic cloves. Results The simulation results were analyzed that the residual number of particles, a bulk property that can be measured simply in the experiment, is related to the coefficients of friction. In the heap formation experiments with low particle counts, the bulk properties were more clearly differentiated by the residual number of particles than the angle of repose. Moreover, the bulk properties similar to the actual garlic could not be expressed as a spherical particle model. Thus, an equation for predicting the residual number of particles was derived for the non-spherical garlic clove particle model. Five sets of coefficients of friction were presented using the prediction equation, and all the simulation results were close to the actual residual number of particles and angle of repose of the garlic. Conclusions Although the sizes of garlic cloves have a wide distribution, appropriate inter-particle contact parameters could be predicted. Therefore, the calibration process of the DEM can be shortened using the proposed prediction equation for the residual number of particles with non-spherical particles.

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