MULTISCALE MODELING OF MULTIPHASE FLOW WITH COMPLEX INTERACTIONS
MULTISCALE MODELING OF MULTIPHASE FLOW WITH COMPLEX INTERACTIONS
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DOI：
10.1142/s1756973709000074
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发表时间：
2009-01-01
影响因子：
1.5
通讯作者：
Monaco, E.
中科院分区：
文献类型：
--
作者：
Luo, K. H.;Xia, J.;Monaco, E.
本文介绍了复杂多相流在微观、介观和宏观尺度上的多种建模与仿真方法。每种方法都讨论了其尺度分辨能力及其与其他方法的关系。应用的例子提供了使用液-气系统，其中复杂的多尺度相互作用之间存在的流动，湍流，燃烧和液滴动力学。采用大涡模拟方法，在固定的实验室坐标系下，研究了两种构型下大量液滴对湍流燃烧的影响。直接数值模拟（DNS）在一个移动的框架，然后部署，以揭示详细的液滴和反应区之间的动态相互作用。在LES和DNS中，蒸发液滴在拉格朗日宏观方法中建模，并且与载气相具有双向耦合。最后，液滴碰撞使用多弛豫时间格子玻尔兹曼方法（LBM）进行了研究。LBM用真实流体状态方程处理多相流，这些状态方程是稳定的，可以科普高密度比。给出了成功模拟液滴聚结和偏心分离的实例。最后，本文总结了结果和混合多尺度方法的讨论。
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.