An extended unresolved CFD-DEM coupling method for simulation of fluid and non-spherical particles--颗粒学报PARTICUOLOGY

He, L., Liu, Z., & Zhao, Y. (2022). An extended unresolved CFD-DEM coupling method for simulation of fluid and non-spherical particles. Particuology, 68, 1-12. https://doi.org/10.1016/j.partic.2021.11.001

An extended unresolved CFD-DEM coupling method for simulation of fluid and non-spherical particles

Liping He^a, Zhengxian Liu^a *, Yongzhi Zhao^b

a Department of Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin 300350, China
b Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou 310027, China

10.1016/j.partic.2021.11.001

Volume 68, September 2022, Pages 1-12

Received 4 May 2021, Revised 20 October 2021, Accepted 2 November 2021, Available online 30 November 2021, Version of Record 30 November 2021.

E-mail: zxliu@tju.edu.cn

Highlights

• An extended unresolved CFD-DEM coupling method for simulation of non-spherical particles.

• Porosity and fluid–particle relative velocity for non-spherical particles.

• Availability of the particle shape enlargement method for non-spherical particles.

• Typical cases for verification of the extended unresolved CFD-DEM method.

Abstract

This study develops an extended unresolved CFD-DEM coupling method for simulation of the fluid–solid flow with non-spherical particles. The limitation of fluid grid size is discussed, by simulating the settling of a cylinder in a Newtonian fluid based on the resolved and unresolved CFD-DEM coupling method. Then, the calculation of porosity and the fluid–particle relative velocity based on the particle shape enlargement method for simulation of non-spherical particles is proposed. The availability of the particle shape enlargement method for the simulation of non-spherical particles with different sphericity is discussed in this work, by comparing it with the results from the equivalent diameter enlargement method. The limitation of the equivalent diameter enlargement method for non-spherical particles is revealed from the simulation results. Several typical cases are employed to elaborate and verify the extended unresolved CFD-DEM method based on particle shape enlargement method, by presenting a good consistency with the experimental results. It proves that the extended unresolved CFD-DEM method is suitable for different CFD grid size ratios, and consolidates that it is a universal calculation method for CFD-DEM coupling simulation.

Graphical abstract

Keywords

CFD-DEM; Unresolved method; Fluid–solid flow; Non-spherical particle; Rod

文章导读