4.6 Article

Improvement of the Coarse-Grained Discrete Element Method for Frictional Particles

Journal

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 60, Issue 15, Pages 5651-5664

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.0c06340

Keywords

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Funding

  1. National Natural Science Foundation of China [21978228, 52006172, 51906196]
  2. Shaanxi Provincial Natural Science Basic Research Program-Youth Fund Project [2020JQ050]
  3. Shaanxi Creative Talents Promotion Plan-Technological Innovation Team [2019TD-039]
  4. Fundamental Research Funds for the Central Universities [cxtd2017004]

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This study proposes two new coarsening strategies for the coarse-grained discrete element method (CGDEM) to more accurately predict granular temperature in simulations, particularly for homogeneous cooling systems (HCSs). These strategies also better reproduce time-averaged fields in bubbling fluidized beds compared to traditional strategies, highlighting the importance of considering both inelastic and frictional origins of energy dissipation in the coarsening strategy.
The coarse-grained discrete element method (CGDEM) is promising for its ability to reduce computational cost. However, compared with discrete element method (DEM), CGDEM often overpredicts the granular temperature in simulations of systems with frictional particles. This is partially due to the fact that traditional coarsening strategies only account for the correction to energy dissipation due to inelastic collisions. This work proposes two types of new coarsening strategies that also make the correction to energy dissipation caused by the frictional force between particles. CGDEM simulations of homogeneous cooling systems (HCSs) and two bubbling fluidized beds are executed to evaluate the performance of the proposed strategies. It is found that, relative to CGDEM with traditional coarsening strategies, CGDEM with the proposed strategies gives a more accurate prediction of the instantaneous granular temperature in HCSs. They also better reproduce the time-averaged fields obtained by DEM simulations for the considered bubbling fluidized beds. This demonstrates the necessity of considering both inelastic and frictional origins of energy dissipation in the coarsening strategy.

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