期刊
JOURNAL OF MULTISCALE MODELLING
卷 1, 期 1, 页码 125-156出版社
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S1756973709000074
关键词
Multiscale modeling; multiphase flow; reacting flow; droplet collisions; direct numerical simulation; large eddy simulation; lattice Boltzmann method.
资金
- EPSRC [EP/E011640/1]
- UK Consortium on Computational Combustion for Engineering Applications (COCCFEA) under EPSRC [EP/D080223/1]
- EPSRC [EP/D080223/1] Funding Source: UKRI
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 twoway 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.
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