<i>Calculation of load profiles on a cultivator tine using the discrete elements method</i>

2019 ◽  
Author(s):  
Johannes Bührke ◽  
Florian Schramm ◽  
Ludger Frerichs
Keyword(s):  
Discrete Elements ◽  
Discrete Elements Method

scholarly journals Investigation of interaction of particles of pollution and gas bulb in flotation of wastewater waters

2019 ◽  
Vol 135 ◽  
pp. 01032
Author(s):  
Elena Nazimko ◽  
Sergei Malko ◽  
Anna Semenova ◽  
Vladimir Dorovskoy
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Hydrophobic Surface ◽  
Small Scale ◽  
Discrete Elements ◽  
Chemical Factors ◽  
Flotation Method ◽  
Physical And Chemical ◽  
Kinetics Of ◽  
Discrete Elements Method

The interaction of phases is at the basis of many technologies in different industries. Flotation method is used in wastewater treatment plants to capture and remove contaminants from wastewater. In this case, the interaction of air bubbles with particles of pollution with a hydrophobic surface. These interactions are very difficult to investigate because they are dynamic, subject to a large number of physical and chemical factors, and occur on a small scale. The processes mentioned above have traditionally been studied by laboratory experiments. These tests are tedious and time-consuming and show unsatisfactory accuracy. Analytical studies give idealized results. One of the most powerful alternatives for solving this problem is numerical modeling, which combines dynamics, accuracy and consideration of sophisticated details. This model is based on the discrete elements method. In this paper, a computer model for modeling the kinetics of the interaction of phases in wastewater treatment is considered.

scholarly journals Modeling of Transport of Loose Products with the Use of the Non-Grid Method of Discrete Elements (DEM)

Processes ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 1489 ◽  
Author(s):  
Dariusz Kryszak ◽  
Adrian Bartoszewicz ◽  
Szymon Szufa ◽  
Piotr Piersa ◽  
Andrzej Obraniak ◽  
...  
Keyword(s):  
Food Industry ◽  
Bulk Material ◽  
Grid Method ◽  
Calculation Model ◽  
Structural Elements ◽  
Discrete Elements ◽  
Tangential Forces ◽  
Soft Fruit ◽  
Discrete Elements Method ◽  
Transport Device

The application of the Discrete Element Method (DEM) allows simulating the movement of a particle of any shape in a conveyor. The DEM method uses the assumptions of the Lagrange calculation model, in which each particle in the domain is tracked individually. It makes it possible to conduct a thorough examination of the behavior of the entire bulk material bed consisting of a set of elements with characteristic physicochemical properties. Therefore, the deposit is not considered according to averages and constants, e.g., strength values, but as a set of elements that can be described individually. The article presents the results of a simulation, with the use of the Discrete Elements Method (DEM), of the process of soft fruit transport in the food industry. The results of the research and exemplary simulations of blueberry fruit transport are presented. The influence of the type of a transport device on the values of normal and tangential forces occurring between the blueberry fruit and structural elements of the transport device, as well as the interaction between the fruits, were modeled. In addition, based on the amount of energy absorbed by each fruit due to collisions, the analysis of the energy spectrum of collisions of particles was carried out to determine the likelihood of damage to the fruit in transport and to identify the phenomena that favor it.

Prediction of the permeability of proppant packs under load

2015 ◽  
Vol 26 (10) ◽  
pp. 1550117
Author(s):  
Dmitry Bikulov ◽  
Anton Saratov ◽  
Eugene Grachev
Keyword(s):  
Grain Size ◽  
Standard Procedure ◽  
Mechanical Deformation ◽  
Size Distributions ◽  
Discrete Elements ◽  
Grain Size Distributions ◽  
Optimal Material ◽  
Different Grain Size ◽  
Boltzmann Method ◽  
Discrete Elements Method

The calculation of proppant pack properties under load is useful to determine the optimal material parameters and grain size distribution. A simple, yet effective model for simulation of both mechanical deformation and permeability of the pack in specific case of polymeric proppant is presented. The mechanical deformation modeling is similar to the discrete elements method, where permeability is calculated with the lattice Boltzmann method. The simulation imitates the standard procedure for measuring the conductivity of a proppant. Permeabilities for different loads and different grain size distributions are obtained.

scholarly journals Elastic wave velocity and attenuation in granular material

2021 ◽  
Vol 249 ◽  
pp. 11001
Author(s):  
Fan Jia ◽  
Hongyang Cheng ◽  
Sihong Liu ◽  
Vanessa Magnanimo
Keyword(s):  
Quality Factor ◽  
Wave Velocity ◽  
Granular Media ◽  
Confining Pressure ◽  
Elastic Wave Velocity ◽  
Input Frequency ◽  
Discrete Elements ◽  
Seismic Quality Factor ◽  
Waves Propagation ◽  
Discrete Elements Method

Discrete Elements Method simulations are carried out to investigate waves propagation in isotropic, frictional granular media. The focus is on the effects of confining pressure, microstructure and input frequency on both wave velocity and attenuation. The latter is described via the seismic quality factor Q and three different measurement approaches are compared, in time and frequency domain. The simulation data validate previous findings on the scaling of wave velocity with confining pressure and coordination number. The quality factor Q shows a non-monotonic behavior with input frequency.

scholarly journals Mixing of Bi-Dispersed Milli-Beads in a Rotary Drum. Mechanical Segregation Analyzed by Lab-Scale Experiments and DEM Simulation

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1166
Author(s):  
Aline Mesnier ◽  
Roman Peczalski ◽  
Guilhem Mollon ◽  
Séverine Vessot-Crastes
Keyword(s):  
Discrete Element ◽  
Front Side ◽  
Discrete Elements ◽  
Simulation Data ◽  
Segregation Index ◽  
Dem Simulation ◽  
Rotary Drum ◽  
Horizontal Drum ◽  
Dem Model ◽  
Discrete Elements Method

Mechanical flow and segregation phenomena within a bed composed of milli-metric size spherical beads rotated in a horizontal drum were investigated. The beads population was bi-dispersed, with two kinds of binary (half by half) compositions: a bi-size bed with two different sizes and a bi-density bed with two different densities. The distributions of the beads were observed optically on the front side of the bed by means of a lab-scale drum prototype. Different numbers and lengths of peripheral straight baffles were tested as well as different drum filling ratios. The photographical data were processed to obtain the front layer mechanical segregation index. This experimental index was compared to the simulated one, obtained by means of commercial discrete element software EDEM. The simulations were corroborated by the experiments provided that the friction coefficients of the discrete elements method (DEM) model were correctly adjusted. The global segregation index was also calculated from simulation data for all considered cases and its values were lower and less sensitive to baffles’ configurations than those for the front layer.

Multidomain finite and discrete elements method for impact analysis of a concrete structure

2009 ◽  
Vol 31 (11) ◽  
pp. 2735-2743 ◽  
Author(s):  
Jessica Rousseau ◽  
Emmanuel Frangin ◽  
Philippe Marin ◽  
Laurent Daudeville
Keyword(s):  
Concrete Structure ◽  
Impact Analysis ◽  
Discrete Elements ◽  
Discrete Elements Method
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