Simulation of Two Circular Particles Falling in Vertical Channel: Combination of Immersed Boundary Lattice Boltzmann Method and Discrete Element Method
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Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
In this study, Immersed Boundary-Lattice Boltzmann Method (IB-LBM) as a fluid solver is combined with Discrete Element Method (DEM) as a collision model. The consequences of this arrangement go to a numerical great model (IB-LB-DEM) which is capable to simulate particulate flows with second-order accuracy. To apply non-slip boundary condition, Eulerian velocities are interpolated in Lagrangian nodes using diffuse delta function. In DEM, two particles can penetrate to each other which this approach generates more realistic model rather other collision rules. Generally, in this model, the most important parameter is overlap distance between two particles which is directly related to amount of particles rigidity. The mentioned hybrid method is validated by simulation of dry-contact of two particles and sedimentation of single particle in vertical channel, individually. Finally, sedimentation of two circular particles in vertical channel is studied and effects of physical parameters such as rigidity, restitution coefficient and friction coefficient in particles behavior has been investigated. Finally, it is shown that increasing friction coefficient leads to increasing in kissing time that causes a change in particles path. For this particular model, It is also dedicated that restitution coefficient does not have significant effect in particles behavior.
Language:
Persian
Published:
Amirkabir Journal Mechanical Engineering, Volume:51 Issue: 2, 2019
Pages:
313 to 328
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