Global ETD Search
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Showing 1 to 20 of 194 for “"discrete element"”.
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Discrete element computation : algorithms and architecture
The Discrete Element Method is a numerical technique used to model physical phenomena through the dynamic interactions of a large number of distinct bodies. The strength of the method lies in its ability to accurately model the behavior of inherently discontinuous media, such as granular, …
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Discrete element method simulation of wheat bulk density
… and wheat bulk density was simulated using the discrete element method (DEM). The objectives of this research were to: (1) experimentally investigate the influence of kernel shape and size on packing ratio and compressibility of wheat, (2) determine the influence of particle shape and contact …
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Three -Dimensional Discrete Element Simulation for Granular Materials
BLOKS3D is parallelized with OpenMP on NCSA supercomputers to seek higher computational speed, and a speed up ratio of 3∼5 has been achieved. The largest size simulations involve more than 97,000 particles.
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Parametric Analysis of Particle Spreading with Discrete Element Method
… parameters on the spreading process using the discrete element method (DEM). To effectively address the vast parameter space within computational constraints, novel parameter sweep algorithms based on low discrepancy sequence (LDS) are utilized in conjunction with parallel computing. Based on …
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Discrete element models for granular materials and rock masses
Discrete element methods (DEMs) are a family of related numerical procedures for solving problems that exhibit gross discontinuous behavior. Many of these methods are capable of analyzing multiple interacting bodies undergoing large displacements and rotations. These methods are suitable for …
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Discrete Element Modeling of Granular Flows in Vibrationally-fluidized Beds
… For such a system, it was decided that a discrete element method (DEM) was the most appropriate tool to model bulk velocity and circulation of media. In the first phase of the work, a vibratory finisher was modified to introduce planar vibration into a single layer of particles. The motion …
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Discrete element simulations and constitutive modeling of dense granular flows
… <p>transition, using both microscale DEM (discrete element method)</p> <p>simulations and macroscale modeling methods. The rheology of dense sheared granular flow in a Couette device is simulated using DEM. It is found that DEM simulations are capable of capturing the regime transition from …
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DEM [Discrete Element Method] simulations of drained and undrained behaviour
This thesis reports the results of DEM (Discrete Element Method) simulations of the behaviour of granular material for axisymmetric compression and plane strain deformation under both drained and undrained conditions. The aim is to study the behaviour of saturated granular material using DEM and …
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Analysis of Shells by a Non-Orthogonal Discrete Element System
Made available in DSpace on 2014-12-08T23:56:59Z (GMT). No. of bitstreams: 1 6808190.pdf: 2380694 bytes, checksum: e6ed255b9133b25339ffc947b913e6ad (MD5) Previous issue date: 1967
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Developments in large scale discrete element simulations with polyhedral particles
… macroscopic behavior, which originates from its discrete nature at the grain scale. Discrete Element Method (DEM) was proposed three decades ago to account for such discontinuity in the materials, and since then significant algorithmic developments have been made to enhance the performance of …
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Resolution of grain scale interactions using the Discrete Element Method
… investigating granular systems is the Discrete Element Method (DEM). Nearly all implementations of the DEM, however, use spheres to represent particles despite mounting evidence showing that shape at multiple scales (sphericity, angularity, and friction) plays a role in granular …
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Seismic vulnerability of historical structures with the discrete element method
… explored the potentials and limitations of the Discrete Element Method for this type of problem, a new joint model for the quasistatic analysis of block structures is proposed. It accounts for (a) the non coplanarity of the contact surfaces, and (b) friction softening. The new model allowed a …
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Spatial reasoning for generalized N-body physics : discrete element algorithms
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1999.
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Decoding details : integrating physics of assembly in discrete element structures
… during assembly using only joint details. Finite element (FE) analysis is performed at every step of the assembly sequence to show global and local instability. Local translation freedom (LTF) analysis shows the range of feasible assembly directions. Detailing knowledge is studied and encoded in …
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A distributed discrete element modeling environment : algorithms, implementation and applications
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1996.
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Discrete Element Method (DEM) Contact Models Applied to Pavement Simulation
Pavement is usually composed of aggregate, asphalt binder, and air voids; rigid pavement is built with hydraulic cement concrete; reinforced pavement contains steel. With these wide ranges of materials, different mechanical behaviors need to be defined in the pavement simulation. But so far, there …
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Discrete element method simulation of wear due to soil-tool interaction
… wear studies. The goal was to utilize discrete element method (DEM) simulations to recreate the results of a circular soil bin test in order to develop a relationship that could be used to predict wear under different conditions. Through the application of DEM, simulations could be used …
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Numerical simulation of selected geologic processes based on Discrete Element Method
… modeling of geologic processes based on Discrete Element Method (DEM), including modeling of pull-apart basin development based on Particle Flow Code (PFC) and simulation of deformation and earthquake potential of Ordos Block (China) under present tectonic stress regime based on Universal …
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Acceleration of the discrete element method on a reconfigurable co-processor
… but one of the best and most important is the Discrete Element Method (DEM). The DEM was first developed during the 70’s, but its widespread use has been hampered by its extremely computationally demanding nature. The DEM can be run on a parallel computer by farming out different sub-domains …
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Three-Dimensional Discrete Element Simulation of Granular Materials Using Polyhedral Particles
*This dissertation is a compound document (contains both a paper copy and a CD as part of the dissertation). The CD requires the following system requirements: Microsoft Office.
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