Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 10 of 10 for “"Discrete element simulations"”.
-
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 …
-
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 …
-
Microscopic description of the granular fluidity field in nonlocal flow modeling
… and packing fraction. This is verified with many discrete element simulations, which show the operational fluidity definition, solutions of the fluidity model, and the proposed microscopic formula all agree. Kinetic theoretical and Eyring-like explanations shed insight into the obtained form.
-
Migration of an intruder particle in a boundary driven shear flow
This study reports on three-dimensional, discrete element simulations of a single large spherical intruder in a Couette shear flow composed of uniform sized particles. The simulation results are useful in providing a numerical reproduction of the experiments for size segregation and mixing. This in …
-
Stochastic and deterministic dynamics investigation of the microstructure of granular materials
… that is studied by using theory, experiments and simulations. While these studies have yielded some important results, there still are many details about the mechanisms of granular compaction that are unknown. In this thesis, the density relaxation phenomenon is modeled using both Monte Carlo and …
-
DEM simulated floor pressure induced by a granular column
… column. This phenomenon is investigated using discrete element simulations of inelastic, frictional spheres in a cylindrical vessel having a particle-to-cylinder diameter ratio at approximately 13.3 or 26.6, with varying bed heights in both cases. The axial pressure profile and the load …
-
DEM simulated radial and axial pressure in a cylindrical granular column
… this physical hypothesis is investigated using Discrete Element Simulations of inelastic with a cylindrical vessel and an axial pressure load. In addition, we studied the radial solid fraction to better understand the pattern of radial pressure evolution. The force model that corresponds to …
-
Vibration-induced densification of granule materials
Physical experiments as well as discrete element simulations of vibration are carried out. The use of different amplitudes and frequencies are applied in the experiments to facilitate the observation of densification trends with mono-disperse acrylic spheres and multi-disperse polyethylene pellets. …
-
Energy propagation in jammed granular matter
… studies on these systems are presented using discrete element simulations that model the granular particles as soft, elastic, and frictional disks which interact when in contact. These simulations are used for the purpose of analyzing a few granular systems with the main emphasis on …
-
Investigation on the mechanisms of block cracking in asphalt pavements
… to constant thermal stresses, a two-dimensional discrete element viscoelastic and heterogeneous micromechanical model, and a three-dimensional discrete element viscoelastic and inhomogeneous micromechanical pavement model subjected to thermal straining were developed. Analytical solutions of …