CFD simulations of circulating fluidized bed risers, part I: Grid study

Tingwen Li, Aytekin Gel, Sreekanth Pannala, Mehrdad Shahnam, Madhava Syamlal

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


In this work, a detailed grid refinement study was carried out for two well-documented circulating fluidized bed (CFB) systems with the focus on grid convergence of 2D numerical simulations. It is demonstrated that the grid convergence of numerical simulations depends on the flow field variable chosen for verification. For axial pressure gradient, this study shows that no general rule for grid size is available to guarantee the grid-independent results. In addition, the inlet and outlet configuration used in the 2D simulations shows a significant impact on the grid convergence. A 3D grid study is also presented with the intent to probe the differences between 2D and 3D numerical simulations with respect to the grid convergence. For the case considered in this study, the 3D simulation demonstrates better grid convergent behavior than the 2D simulation with comparable grid sizes.

Original languageEnglish (US)
Pages (from-to)170-180
Number of pages11
JournalPowder Technology
StatePublished - Mar 2014


  • Circulating fluidized bed
  • Computational fluid dynamics
  • Gas-solid flow
  • Numerical simulation
  • Pressure drop
  • Riser flow

ASJC Scopus subject areas

  • General Chemical Engineering


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