Verification of coarse-grained CFD-DEM method in multiple flow regimes

LIN Junjie; LUO Kun; WANG Shuai; HU Chenshu; FAN Jianren

doi:10.11949/j.issn.0438-1157.20180962

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Verification of coarse-grained CFD-DEM method in multiple flow regimes

Fluid dynamics and transport phenomena | 更新时间：2026-07-24

- Verification of coarse-grained CFD-DEM method in multiple flow regimes
- CIESC Journal Vol. 70, Issue 5, Pages: 1702-1712(2019)
- 作者机构：
  
  浙江大学能源清洁利用国家重点实验室，浙江杭州 310027
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180962
  CLC： TQ 018
- Received：27 August 2018，
  
  Revised：2019-02-22，
  
  Online First：24 July 2026，
  
  Published：05 May 2019
- 稿件说明：
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林俊杰, 罗坤, 王帅, 胡陈枢, 樊建人. coarse-grained CFD-DEM方法在不同流态流化床中的模拟验证[J]. 化工学报, 2019, 70(5): 1702-1712

LIN Junjie, LUO Kun, WANG Shuai, HU Chenshu, FAN Jianren. Verification of coarse-grained CFD-DEM method in multiple flow regimes[J]. CIESC Journal, 2019, 70(5): 1702-1712
林俊杰, 罗坤, 王帅, 胡陈枢, 樊建人. coarse-grained CFD-DEM方法在不同流态流化床中的模拟验证[J]. 化工学报, 2019, 70(5): 1702-1712 DOI： 10.11949/j.issn.0438-1157.20180962.

LIN Junjie, LUO Kun, WANG Shuai, HU Chenshu, FAN Jianren. Verification of coarse-grained CFD-DEM method in multiple flow regimes[J]. CIESC Journal, 2019, 70(5): 1702-1712 DOI： 10.11949/j.issn.0438-1157.20180962.

摘要

传统CFD-DEM方法的计算量随着系统内颗粒数目的增加而显著增加，coarse-grained CFD-DEM（粗颗粒）方法将若干个真实颗粒打包成虚拟颗粒从而显著减小系统计算量。在coarse-grained CFD-DEM方法进行应用之前，对其进行广泛的验证是有必要的。采用coarse-grained CFD-DEM方法模拟得到不同流态流化床的气固流动特征（固含率、压降、颗粒速度等），与传统CFD-DEM和实验测量吻合较好。另外，系统的计算效率随着粗颗粒放大系数的增加显著提升。研究表明，粗颗粒方法能够以较小的计算精度损失而使计算速度大幅提升，能够适用于大尺度稠密气固流动系统的模拟。

Abstract

The computation load for traditional computational fluid dynamics-discrete element method (CFD-DEM) simulations tremendously increases when the number of particles augments in the system. The coarse-grained CFD-DEM method

in which a number of real particles are lumped into a numerical parcel

can remarkably reduce the computation load. It is necessary to extensively verify the coarse-grained CFD-DEM method before it is applied. Therefore

in the current work

the coarse-grained CFD-DEM method is validated in fluidized beds with various fluidization regimes. On one hand

it is found that gas and solid features (

void fraction

pressure signals

and particle velocity) obtained from this method match well with

the experiment measurements. On the other hand

as the coarse-grained ratios increase

the calculation time for a specific case is significantly reduced. In summary

the coarse-grained CFD-DEM contributes a great improvement of calculation efficiency while a little loss of numerical accuracy

which is expected to be a powerful tool to simulate gas-solid flow dynamics in large-scale dense particulate systems.

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Keywords

references

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