DEM–LES study of 3-D bubbling fluidized bed with immersed tubes

High-fidelity simulation of the 3-D full-loop gas–solid flow characteristics in the circulating fluidized bed

“…As a particle may cross the boundaries of several computational grids, the segmentation of a particle is usually utilized to obtain the accurate volume fraction of a specific computational grid in numerical simulations (Gui et al, 2008;Yang et al, 2014aYang et al, , 2014b. Every particle is divided into 48 elements and the computational cell that a specific particle element locates in is detected based on its position.…”

Numerical study of particle mixing in bubbling fluidized beds based on fractal and entropy analysis

“…The DEM-LES coupled approach has been validated in our previous study (Gui et al, 2008) and applied successfully for simulation of fluidized beds ).…”

“…the results obtained from a real three-dimensional particle system would be more informative and useful. However, it is so hard to carry out a simulation of a 3-D fluidized bed that any attempt on this issue is always intensively limited to reduced scales (Gui et al, 2008;Tsuji et al, 2008). …”

“…The DEM-LES coupled approach has been validated previously by Gui et al (2008). Different from previous researches, our attention is only focused on the mixing interface between two separated parts of mono-dispersed particles, and a non-dimensional measuring function is defined to quantify the degree of mixing.…”

Coupling CFD-DEM with dynamic meshing: A new approach for fluid-structure interaction in particle-fluid flows

“…Different approaches have been used to treat the stationary boundary of the tube in CFD calculation either using staircase approximation on a Cartesian grid [20,21] or accurately representing the boundary shape using body-fitted unstructured mesh [22,23]. Considerable efforts have been devoted to various aspects of the fluidized bed, including heat transfer [21,24,25], bubble hydrodynamics [20,26] and erosion of the tube surface [27]. However, the capability of CFD-DEM methods to tackle FSI problems in particle-fluid flow is lacking, especially when the fluid field is described by a continuous mesh-based method, such as Finite Volume Method (FVM) or Finite Difference Method (FDM).…”