Lattice Boltzmann simulations of settling behaviors of irregularly shaped particles

Zhang, Pei, Galindo-Torres, S. A., Tang, Hongwu, Jin, Guangqiu, Scheuermann, A. and Li, Ling (2016) Lattice Boltzmann simulations of settling behaviors of irregularly shaped particles. Physical Review E, 93 6: . doi:10.1103/PhysRevE.93.062612

Author Zhang, Pei
Galindo-Torres, S. A.
Tang, Hongwu
Jin, Guangqiu
Scheuermann, A.
Li, Ling
Title Lattice Boltzmann simulations of settling behaviors of irregularly shaped particles
Journal name Physical Review E   Check publisher's open access policy
ISSN 2470-0045
Publication date 2016-06-22
Year available 2016
Sub-type Article (original research)
DOI 10.1103/PhysRevE.93.062612
Open Access Status Not Open Access
Volume 93
Issue 6
Total pages 13
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Formatted abstract
We investigated the settling dynamics of irregularly shaped particles in a still fluid under a wide range of conditions with Reynolds numbers Re varying between 1 and 2000, sphericity φ and circularity c both greater than 0.5, and Corey shape factor (CSF) less than 1. To simulate the particle settling process, a modified lattice Boltzmann model combined with a turbulence module was adopted. This model was first validated using experimental data for particles of spherical and cubic shapes. For irregularly shaped particles, two different types of settling behaviors were observed prior to particles reaching a steady state: accelerating and accelerating-decelerating, which could be distinguished by a critical CSF value of approximately 0.7. The settling dynamics were analyzed with a focus on the projected areas and angular velocities of particles. It was found that a minor change in the starting projected area, an indicator of the initial particle orientation, would not strongly affect the settling velocity for low Re. Periodic oscillations developed for all simulated particles when Re>100. The amplitude of these oscillations increased with Re. However, the periods were not sensitive to Re. The critical Re that defined the transition between the steady and periodically oscillating behaviors depended on the inertia tensor. In particular, the maximum eigenvalue of the inertia tensor played a major role in signaling this transition in comparison to the intermediate and minimum eigenvalues.
Keyword Eigenvalues
Nonspherical Particles
Reynolds number
Lattice Boltzmann models
Lattice Boltzmann simulations
Irregularly shaped particles
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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