Journal
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
Volume 114, Issue -, Pages 287-302Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmultiphaseflow.2019.03.017
Keywords
Multiphase turbulence; Kinetic theory based two-fluid model (TFM); Sub-grid closure; Structural turbulence model; ADM regularization
Categories
Funding
- Austrian Federal Ministry for Digital and Economic Affairs
- National Foundation for Research, Technology and Development
- K1MET center for metallurgical research in Austria
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In our prior study (Schneiderbauer and Saeedipour, Phys. Fluids, 2018; 30:023301), an a-priori analysis on the spatially-filtered two-fluid model (TFM) was presented for turbulent gas-solid flows, where the unresolved terms were modeled by an approximate deconvolution model (ADM). With such an approach, an approximation of the unfiltered solution is obtained by repeated filtering allowing the determination of the RSFS (resolved sub-filter scales) contribution of unclosed terms of the filtered equations directly. In the present study, this ADM-TFM approach is implemented in an a-posteriori manner for the coarse grid simulation of a fluidized bed of Geldart type B particles and is verified against highly-resolved TFM simulations. Furthermore, different regularization methods, which account for the sub-filter scale (SFS) contribution, are presented and discussed with respect to their predictiveness and stability. It is shown that employing an appropriate Theological model for the solid phase considerably improves stability without removing too much energy from the resolved scales. Finally, the ADM-TFM predictions are in fairly good agreement with the fine grid reference case and do not show a notable grid-dependency. Compared to TFM simulations using the same grid resolution, the ADM-TFM approach does only require marginally more computational resources. (C) 2019 Elsevier Ltd. All rights reserved.
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