Multiscale modelling of multiphase flow with complex interactions


Luo, K.H., Xia, J. and Monaco, E. (2009) Multiscale modelling of multiphase flow with complex interactions. Journal of Multiscale Modelling, 1, (1), 125-156. (doi:10.1142/S1756973709000074).

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Description/Abstract

This paper presents a variety of modeling and simulation methods for complex multiphase flow at microscopic, mesoscopic and macroscopic scales. Each method is discussed in terms of its scale-resolving capability and its relationship with other approaches. Examples of application are provided using a liquid–gas system, in which complex multiscale interactions exist among flow, turbulence, combustion and droplet dynamics. Large eddy simulation (LES) is employed to study the effects of a very large number of droplets on turbulent combustion in two configurations in a fixed laboratory frame. Direct numerical simulation (DNS) in a moving frame is then deployed to reveal detailed dynamic interactions between droplets and reaction zones. In both the LES and the DNS, evaporating droplets are modeled in a Lagrangian macroscopic approach, and have two-way couplings with the carrier gas phase. Finally, droplet collisions are studied using a multiple-relaxation-time lattice Boltzmann method (LBM). The LBM treats multiphase flow with real-fluid equations of state, which are stable and can cope with high density ratios. Examples of successful simulations of droplet coalescence and off-center separation are given. The paper ends with a summary of results and a discussion on hybrid multiscale approaches

Item Type: Article
ISSNs: 1756-9737 (print)
Related URLs:
Keywords: multiscale modeling, multiphase flow, reacting flow, droplet collisions, direct numerical simulation, large eddy simulation, lattice boltzmann method
Subjects: T Technology > TP Chemical technology
T Technology > TJ Mechanical engineering and machinery
T Technology > TD Environmental technology. Sanitary engineering
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Thermofluids and Superconductivity
ePrint ID: 69189
Date Deposited: 23 Oct 2009
Last Modified: 28 Mar 2014 15:25
Research Funder: EPSRC
Projects:
Study of Vitiated Turbulent Combustion for Low-Emission High-Efficiency Hybrid Energy Systems
Funded by: EPSRC (EP/E011640/1)
Led by: Kai Hong Luo
1 March 2007 to 28 February 2010
Contact Email Address: K.H.Luo@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/69189

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