Numerical simulation of polygonal particles moving in incompressible viscous fluids--颗粒学报PARTICUOLOGY

Fu, X., Yao, Z., & Zhang, X. (2017). Numerical simulation of polygonal particles moving in incompressible viscous fluids. Particuology, 31, 140-151. https://doi.org/10.1016/j.partic.2016.05.016

Numerical simulation of polygonal particles moving in incompressible viscous fluids

Xiaowu Fu, Zhaohui Yao ^*, Xiwen Zhang

Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China

10.1016/j.partic.2016.05.016

Volume 31, April 2017, Pages 140-151

Received 8 December 2015, Revised 6 May 2016, Accepted 11 May 2016, Available online 23 December 2016, Version of Record 9 March 2017.

E-mail: yaozh@tsinghua.edu.cn

Highlights

• A two-dimensional LB-IB-DEM method was proposed for polygonal particles moving in fluids.

• A collision model of polygonal particles was used in the discrete element method.

• The proposed scheme could deal with moving of particles with irregular geometries in fluids.

Abstract

A two-dimensional coupled lattice Boltzmann immersed boundary discrete element method is introduced for the simulation of polygonal particles moving in incompressible viscous fluids. A collision model of polygonal particles is used in the discrete element method. Instead of a collision model of circular particles, the collision model used in our method can deal with particles of more complex shape and efficiently simulate the effects of shape on particle–particle and particle–wall interactions. For two particles falling under gravity, because of the edges and corners, different collision patterns for circular and polygonal particles are found in our simulations. The complex vortexes generated near the corners of polygonal particles affect the flow field and lead to a difference in particle motions between circular and polygonal particles. For multiple particles falling under gravity, the polygonal particles easily become stuck owing to their corners and edges, while circular particles slip along contact areas. The present method provides an efficient approach for understanding the effects of particle shape on the dynamics of non-circular particles in fluids.

Graphical abstract

Keywords

Polygonal particle; Particle–fluid interaction; Lattice Boltzmann method; Immersed boundary method; Discrete element method

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