CFD–DEM–VDGM method for simulation of particle fluidization behavior in multi-ring inclined-hole spouted fluidized bed--颗粒学报PARTICUOLOGY

Chen, M., Chen, Z., Gong, M., Tang, Y., & Liu, M. (2021). CFD–DEM–VDGM method for simulation of particle fluidization behavior in multi-ring inclined-hole spouted fluidized bed. Particuology, 57, 112-126. https://doi.org/10.1016/j.partic.2021.01.004

CFD–DEM–VDGM method for simulation of particle fluidization behavior in multi-ring inclined-hole spouted fluidized bed

Meng Chen ^a, Zhao Chen ^a, Ming Gong ^b, Yaping Tang ^a, Malin Liu ^a *

a Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
b School of Chemical Engineering, Northwest University, Xi’an 710069, China

10.1016/j.partic.2021.01.004

Volume 57, August 2021, Pages 112-126

Received 29 August 2020, Revised 21 December 2020, Accepted 11 January 2021, Available online 5 February 2021, Version of Record 23 February 2021.

E-mail: liumalin@tsinghua.edu.cn

Highlights

• A novel virtual dual-grid model is first proposed to accelerate CFD-DEM simulation.

• CFD-DEM-VDGM model is used to simulate fluidization behavior of 4.2 million particles.

• The volume fraction calculation speed is increased more than 10 times in complex geometry.

• The improved particle data transfer pattern can save more than 90% of the data transfer time.

• The scale-up law of FB-CVD process was proposed based on volume fraction distribution.

Abstract

The simulation of particle fluidization behavior in a complex geometry with a large number of particles is challenging owing to the complexity of unstructured computational grids and high computational intensity. In this study, a virtual dual-grid model (VDGM) is proposed to calculate the solid volume fraction in unstructured grids and speed up the calculation. The VDGM is coupled with a computational fluid dynamics–discrete element method model to simulate particle fluidization behavior in a multi-ring inclined-hole spouted fluidized bed with 4.2 million particles under a high temperature of 1423 K. A computational fluid dynamics–discrete element method–virtual dual-grid model (CFD–DEM–VDGM) coupling model is implemented based on commercial software Fluent and EDEM. The time step settings in Fluent and EDEM and the pattern of particle data transfer in Fluent are improved to speed up the calculation. It is discovered that the VDGM can calculate the solid volume fraction in unstructured grids of complex geometry and speed up the calculation effectively. The calculation speed increased by more than 10 times compared with that of the segmentation sampling method. The new pattern of particle data transfer in Fluent can reduce data transfer time by more than 90%. The fluidization behavior of 4.2 million high-density particles in the multi-ring inclined-hole spouted fluidized bed is obtained and analyzed in detail. The CFD–DEM–VDGM coupling method is validated for the bed expansion height and spouting cycle time in a spouted fluidized bed via experimental results.

Graphical abstract

Keywords

Virtual dual-grid model; CFD–DEM–VDGM; Spouted fluidized bed; Unstructured grids; Particle fluidization

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