475122 Development of Filtered Particulate Eulerian Modeling Approach for the Prediction of Bi-Disperse Gas-Solid Fluidized Bed
Following Igci et al. , filtered approach may be developed where the unknown terms accounting for the influence of unresolved structures, called sub-grid contributions, have to be modelled in terms of the computed (filtered) variables. In the work presented here, the development of such modelling approach is based on a priori analysis of 3D periodic circulating bi-disperse gas-solid fluidized bed simulations using computational grids cell size of a few particle diameters to obtain mesh-independent results. Using the 3D N-Euler multiphase code NEPTUNE_CFD, separate transport equations are computed for the number density, velocity and random kinetic energy of the two solid species, coupled by collisions terms developed in the frame of kinetic theory of granular media supplemented by interstitial gas effect. These mesh-independent results are filtered using volume average to support the development of closure models for the subgrid fluid-particle and particle-particle interactions terms in bi-disperse gas-solid fluidized bed. These closure models are implemented in the multiphase code NEPTUNE_CFD and tested by performing coarse grid simulation of the periodic circulating bi-disperse gas-solid fluidized bed.
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