(751c) Dynamic Multiscale Method for Gas-Solid Flow

Multiscale simulation of gas-solid flow, including direct numerical simulations, discrete particle methods and continuum models, is popular in fluidization community. Especially, there is a rapid development of the so-called correlative multiscale method (Li and Kwauk, 2003), where lower level models are used to obtain the constitutive relationships needed in higher level models (van der Hoef et al., 2008; Tenneti and Subramaniam, 2014). For example, direct numerical simulations have been extensively used to obtain the drag correlations used in two-fluid models and discrete particle methods. However, one-way and offline coupling features of correlative multiscale method make itself not the best way to mimic the two-way and dynamic coupling nature of gas-solid flow. In this study, dynamic multiscale method is proposed to couple different simulation methods in a two-way and online coupling manner (Chen and Wang, 2015; Chen et al., 2016; Chen and Wang, 2017). Two-fluid model is dynamically coupled with discrete particle method to simulate gas-solid flow in a channel. This study proofs the possibility of dynamic multiscale method for simulating gas-solid flow.

Chen X, Wang J. 2015. Hybrid Discrete-continuum Model for Granular Flow. Procedia Engineering 102, 661-667.

Chen X, Wang J. 2017. Dynamic multiscale method for gas-solid flow via spatiotemporal coupling of two-fluid model and discrete particle model. AIChE Journal, DOI:10.1002/aic.15723.

Chen X, Wang J, Li J. 2016. Multiscale modeling of rapid granular flow with a hybrid discrete-continuum method. Powder Technology 304, 177-185.

Li J, Kwauk M. 2003. Exploring complex systems in chemical engineering: the multi-scale methodology. Chemical Engineering Science 58, 521-535.

Tenneti S, Subramaniam S. 2014. Particle-Resolved Direct Numerical Simulation for Gas-Solid Flow Model Development. Annual Review of Fluid Mechanics 46, 199-230.

van der Hoef MA, van Sint Annaland M, Deen NG, Kuipers JAM. 2008. Numerical simulation of dense gas-solid fluidized beds: A multiscale modeling strategy. Annual Review of Fluid Mechanics 40, 47-70.