Verification of EMMS Formulation Using Lattice Boltzmann Simulations

Abstract

The Energy Minimisation Multi-Scale (EMMS) drag model provides a physically motivated correction to standard drag correlations for gas-solid flows in circulating fluidized beds by accounting for the formation of particle clusters. However, the formulation of the EMMS model involves assumptions about meso-scale structure that require verification against independent simulation data. This study employs lattice Boltzmann method (LBM) simulations to verify the EMMS formulation for gas-solid drag in cluster-containing flows.

Lattice Boltzmann simulations were conducted for gas-solid flow configurations containing particle clusters to compute the effective drag force without recourse to the EMMS assumptions. The drag values computed from LBM simulations were compared with EMMS model predictions across a range of flow conditions. The verification study systematically examines the accuracy of the EMMS formulation and identifies conditions where the model is reliable and where deviations occur. The results provide confidence in the EMMS drag model for application in Eulerian-Eulerian CFD simulations of circulating fluidized bed risers and guide further development of meso-scale drag models for gas-solid flows.

@article{shah2014verification,
  title         = {Verification of EMMS Formulation Using Lattice Boltzmann Simulations},
  author        = {Shah, Milinkumar T and Utikar, Ranjeet P and Tade, Moses O and Pareek,
                  Vishnu K and Evans, Geoffrey M},
  year          = 2014,
  journal       = {Powder Technology},
  publisher     = {Elsevier},
  volume        = 257,
  pages         = {30--39}
}