Title: A multi-scale framework for CFD modelling of multi-phase complex systems based on the EMMS approach
Authors: Ning Yang
Addresses: State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, P.O. Box 353, Beijing, 100190, China
Abstract: The averaged conservative equations in CFD modelling are inadequate to achieve a complete description of the multi-scale structures in multiphase complex systems. By considering the relationship between meso-scale structures and meso-scale energy consumption, stability conditions mathematically expressed as a mutually constrained extremum are proposed in the Energy-Minimization Multi-Scale (EMMS) approach and indispensable to reflect the compromise of different dominant mechanisms for various multiphase systems. The approach is first applied to global systems to predict and physically interpret the macro-scale structure evolution, i.e., regime transition. Then when applied to computational cells, it corrects interphase momentum transfer and greatly improves the accuracy of coarse-grid CFD simulation.
Keywords: multiscale modelling; CFD; computational fluid dynamics; fluidised beds; bubble columns; multiphase systems; interphase momentum transfer; simulation.
Progress in Computational Fluid Dynamics, An International Journal, 2012 Vol.12 No.2/3, pp.220 - 229
Received: 08 May 2021
Accepted: 12 May 2021
Published online: 21 Jun 2012 *