Comparison of the multi-sphere and polyhedral approach to simulate non-spherical particles within the discrete element method: Influence on temporal force evolution for multiple contacts

2011 ◽  
Vol 208 (3) ◽  
pp. 643-656 ◽  
Author(s):  
D. Höhner ◽  
S. Wirtz ◽  
H. Kruggel-Emden ◽  
V. Scherer
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Spherical Particles ◽  
Multiple Contacts ◽  
Polyhedral Approach ◽  
Element Method

scholarly journals Effect of the integration scheme on the rotation of non-spherical particles with the discrete element method

2019 ◽  
Vol 6 (4) ◽  
pp. 545-559 ◽  
Author(s):  
Joaquín Irazábal ◽  
Fernando Salazar ◽  
Miquel Santasusana ◽  
Eugenio Oñate
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Spherical Particles ◽  
Integration Scheme ◽  
Element Method

Surface Lunar Soil Excavation Simulation Based on Three-Dimensional Discrete Element Method

2013 ◽  
Vol 376 ◽  
pp. 366-370
Author(s):  
Hui Gao ◽  
Da Wei Zhang ◽  
Bin Liu ◽  
Long Chen Duan
Keyword(s):  
Discrete Element Method ◽  
Three Dimensional ◽  
Lunar Soil ◽  
Discrete Element ◽  
Spherical Particles ◽  
Lunar Exploration ◽  
The Earth ◽  
Large Numbers ◽  
Soil Excavation ◽  
Element Method

One of the important objectives of lunar exploration is to obtain the lunar soil samples. However, the sampling process is very different from that on the Earth due to special characteristics of the lunar soil and surface environment. In order to ensure that the lunar exploration and sampling are successful, large numbers of ground experiments and computer simulations must be taken. In this paper, the surface lunar soil excavation simulation is investigated by three-dimensional discrete element method (DEM). It is implemented based on the open source LIGGGHTS, which takes the lunar soil as spherical particles. The interaction between the excavation tool and lunar soil is demonstrated. The excavation force and torque have also been calculated in real time. Moreover, the comparison of the excavation in different environments between the Earth and Moon corresponding to their different gravity accelerations was done. This paper shows that three-dimensional discrete element method can be used for the surface lunar soil excavation simulation and can provide important reference results for actual operations.

scholarly journals 2D Image-based calibration of rolling resistance in 3D discrete element models of sand

2021 ◽  
Author(s):  
Marcos Arroyo ◽  
◽  
Riccardo Rorato ◽  
Marco Previtali ◽  
Matteo Ciantia ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Particle Shape ◽  
Rolling Resistance ◽  
Discrete Element ◽  
Spherical Particles ◽  
Shape Effects ◽  
Element Method

Contact rolling resistance is the most widely used method to incorporate particle shape effects in the discrete element method (DEM). The main reason for this is that such approach allows for using spherical particles hence offering substantial computational benefits compared to non-spherical DEM models. This paper shows how rolling resistance parameters for 3D DEM models can be easily calibrated with 2D sand grain images.

Modelling of ice rubble in the punch shear tests with cohesive 3D discrete element method

2019 ◽  
Vol 36 (2) ◽  
pp. 378-399 ◽  
Author(s):  
Arto Sorsimo ◽  
Jaakko Heinonen
Keyword(s):  
Discrete Element Method ◽  
Shear Test ◽  
Discrete Element ◽  
Contact Model ◽  
Spherical Particles ◽  
Content Type ◽  
Material Parameters ◽  
Simulation Results ◽  
Linear Softening ◽  
Element Method

PurposeThis paper aims to simulate a punch shear test of partly consolidated ice ridge keel by using a three-dimensional discrete element method. The authors model the contact forces between discrete ice blocks with Hertz–Mindlin contact model. For freeze bonds between the ice blocks, the authors apply classical linear cohesion model with few modifications. Based on punch shear test simulations, the authors are able to determine the main characteristics of an ice ridge from the material parameters of the ice and freeze bonds.Design/methodology/approachThe authors introduced a discrete model for ice that can be used for modelling of ice ridges. The authors started with short introduction to current status with ice ridge modelling. Then they introduced the model, which comprises Hertz–Mindlin contact model and freeze bond model with linear cohesion and softening. Finally, the authors presented the numerical results obtained using EDEM is commercial Discrete Element Modeling software (EDEM) and analysed the results.FindingsThe Hertz–Mindlin model with cohesive freeze bonds and linear softening is a reasonable model for ice rubble. It is trivial that the ice blocks within the ice ridge are not spherical particles, but according to results, the representation of ice blocks as spheres gave promising results. The simulation results provide information on how the properties of freeze bond affect the results of punch shear test. Thus, the simulation results can be used to approximate the freeze bonds properties within an ice ridge when experimental data are available.Research limitations/implicationsAs the exact properties of ice rubble are unknown, more research is required both in experimental and theoretical fields of ice rubble mechanics.Originality/valueBased on this numerical study, the authors are able to determine the main characteristics of an ice ridge from material parameters of ice and freeze bonds. Furthermore, the authors conclude that the model creates a promising basis for further development in other applications within ice mechanics.

scholarly journals DISCRETE ELEMENT METHOD AND ITS APPLICATION TO THE ANALYSIS OF PENETRATION INTO GRANULAR MEDIA

2004 ◽  
Vol 10 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Robertas Balevičius ◽  
Algis Džiugys
Keyword(s):  
Discrete Element Method ◽  
Granular Media ◽  
Time Integration ◽  
Three Dimensional ◽  
Discrete Element ◽  
Spherical Particles ◽  
Integration Algorithm ◽  
Time Integration Algorithm ◽  
Numerical Time Integration ◽  
Element Method

Application of discrete element method (DEM) to keel penetration in granular media is investigated. The basic relations for visco‐elastic granular media composed of spherical particles are presented, together with 5th order Gear predictor‐corrector scheme for time‐integration. The background version of DEM and numerical time integration algorithm are developed and implemented into DEMMAT code. The implementation of time‐integration algorithm is verified by simple tests concerning particle‐particle, particle‐wall interactions, for which analytical expressions exist. By limiting the size of the media domain, the three‐dimensional problem is reduced to particular case presented as two‐dimensional domain of spherical particles. The variation of keel reaction and distribution of the particle forces due to different material properties are investigated

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