scholarly journals Coupled three‐dimensional discrete element‐lattice Boltzmann methods for fluid‐solid interaction with polyhedral particles

2019 ◽  
Vol 43 (14) ◽  
pp. 2270-2287 ◽  
Author(s):  
Michael Gardner ◽  
Nicholas Sitar
Keyword(s):  
Lattice Boltzmann ◽  
Three Dimensional ◽  
Discrete Element ◽  
Lattice Boltzmann Methods ◽  
Polyhedral Particles ◽  
Fluid Solid Interaction

scholarly journals Investigation of the Permeability of Soil-rock Mixtures Using Lattice Boltzmann Simulations

2021 ◽  
Author(s):  
Lei Jin ◽  
Yawu Zeng ◽  
Jingjing Li ◽  
Hanqing Sun
Keyword(s):  
Lattice Boltzmann ◽  
Three Dimensional ◽  
Element Model ◽  
Seepage Flow ◽  
Discrete Element ◽  
Main Flow ◽  
Lattice Boltzmann Simulations ◽  
Boltzmann Method ◽  
Rock Size ◽  
Rock Shape

Based on the discrete element method and the proposed virtual slicing technique for three-dimensional discrete element model, random pore-structural models of soil-rock mixtures are constructed and voxelized. Then, the three-dimensional lattice Boltzmann method is introduced to simulate the seepage flow in soil-rock mixtures on the pore scale. Finally, the influences of rock content, rock size, rock shape and rock orientation on the simulated permeability of soil-rock mixtures are comprehensively investigated. The results show that the permeability of soil-rock mixtures remarkably decreases with the increase of rock content. When the other conditions remain unchanged, the permeability of soil-rock mixtures increases with the increase of rock size. The permeability of soil-rock mixtures with bar-shaped rocks is smaller than that of soil-rock mixtures with block-shaped rocks, but larger than that of soil-rock mixtures with slab-shaped rocks. The rock orientation has a certain influence on the permeability of SRMs, and the amount of variation changes with the rock shape: when the rocks are bar-shaped, the permeability is slightly decreased as the major axes of these rocks change from parallel to perpendicular with respect to the direction of main flow; when the rocks are slab-shaped, the permeability decreases more significantly as the slab planes of these rocks change from parallel to perpendicular with respect to the direction of main flow.

Three‐dimensional discrete element simulation for granular materials

2006 ◽  
Vol 23 (7) ◽  
pp. 749-770 ◽  
Author(s):  
Dawei Zhao ◽  
Erfan G. Nezami ◽  
Youssef M.A. Hashash ◽  
Jamshid Ghaboussi
Keyword(s):  
Search Algorithm ◽  
Contact Point ◽  
Three Dimensional ◽  
Engineering Application ◽  
Discrete Element ◽  
Content Type ◽  
Polyhedral Particles ◽  
Contact Points ◽  
Neighbor Search ◽  
Force Calculation

PurposeDevelop a new three‐dimensional discrete element code (BLOKS3D) for efficient simulation of polyhedral particles of any size. The paper describes efficient algorithms for the most important ingredients of a discrete element code.Design/methodology/approachNew algorithms are presented for contact resolution and detection (including neighbor search and contact detection sections), contact point and force detection, and contact damping. In contact resolution and detection, a new neighbor search algorithm called TLS is described. Each contact is modeled with multiple contact points. A non‐linear force‐displacement relationship is suggested for contact force calculation and a dual‐criterion is employed for contact damping. The performance of the algorithm is compared to those currently available in the literature.FindingsThe algorithms are proven to significantly improve the analysis speed. A series of examples are presented to demonstrate and evaluate the performance of the proposed algorithms and the overall discrete element method (DEM) code.Originality/valueLong computational times required to simulate large numbers of particles have been a major hindering factor in extensive application of DEM in many engineering applications. This paper describes an effort to enhance the available algorithms and further the engineering application of DEM.

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