Filtered sub-grid constitutive models for fluidized gas-particle flows constructed from 3-D simulations

Avik Sarkar, Fernando E. Milioli, Shailesh Ozarkar, Tingwen Li, Xin Sun, Sankaran Sundaresan

Research output: Contribution to journalArticlepeer-review

124 Scopus citations


The accuracy of fluidized-bed CFD predictions using the two-fluid model can be improved significantly, even when using coarse grids, by replacing the microscopic kinetic-theory-based closures with coarse-grained constitutive models. These coarse-grained constitutive relationships, called filtered models, account for the unresolved gas-particle structures (clusters and bubbles) via sub-grid corrections. Following the previous 2-D approaches of Igci et al. [AIChE J., 54(6), 1431-1448, 2008] and Milioli et al. [AIChE J., 59(9), 3265-3275, 2013], new closures for the filtered inter-phase drag and stresses in the gas and particle phases are constructed from highly-resolved 3-D simulations of gas-particle flows. These new closure relations are then validated through the bubbling-fluidized-bed challenge problem presented by National Energy Technology Laboratory and Particulate Solids Research Inc.

Original languageEnglish (US)
Pages (from-to)443-456
Number of pages14
JournalChemical Engineering Science
StatePublished - Oct 2 2016

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


  • Computational fluid dynamics (CFD)
  • Constitutive models
  • Fluidization
  • Multiphase flow
  • Scale-up
  • Two-fluid model


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