Assessment of numerical methods for fully resolved simulations of particle-laden turbulent flows
Assessment of numerical methods for fully resolved simulations of particle-laden turbulent flows
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DOI：
10.1016/j.compfluid.2018.10.016
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发表时间：
2019-01-30
影响因子：
2.8
通讯作者：
Renon, N.
中科院分区：
文献类型：
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作者：
de Motta, J. C. Brandle;Costa, P.;Renon, N.
在过去的十年中，许多可分辨粒子模拟(RPS)方法被发展用于有限尺寸颗粒湍流的数值研究。本文比较了三种RPS方法对含颗粒衰变湍流情况的影响。这些方法是：基于粘性惩罚方法的流体体积拉格朗日方法(VOF-LAG)；基于流固耦合的正则化Delta函数方法的直接强迫浸没边界方法(IBM)；以及为格子Boltzmann方法发展的反弹格式(LBM-BB)。对这些方法的物理和数值性能进行了分析。所有的方法都观察到了湍流的调制，与单相情况相比，湍流动能的衰减更快。拉格朗日粒子统计量，如速度概率密度函数和速度自相关函数，显示出三种方法之间的微小差异。然而，在粒子动能的演化中，观察到了代码之间的主要差异。这些差异与粒子插入初始单相湍流时初始条件的处理有关。对颗粒/流体的平均滑移速度也进行了分析，与文献中的结果相比较，表现出相似的行为。不同方法的计算性能差别很大。VOF-LAG方法在计算上似乎是最昂贵的。事实上，这种方法并不适用于动荡的情况。IBM和LBM-BB实现显示了非常好的伸缩性。(C)2018爱思唯尔有限公司。保留所有权利。
During the last decade, many approaches for resolved-particle simulation (RPS) have been developed for numerical studies of finite-size particle-laden turbulent flows. In this paper, three RPS approaches are compared for a particle-laden decaying turbulence case. These methods are, the Volume-of-Fluid Lagrangian method, based on the viscosity penalty method (VoF-Lag); a direct forcing Immersed Boundary Method, based on a regularized delta function approach for the fluid/solid coupling (IBM); and the Bounce Back scheme developed for Lattice Boltzmann method (LBM-BB). The physics and the numerical performances of the methods are analyzed. Modulation of turbulence is observed for all the methods, with a faster decay of turbulent kinetic energy compared to the single-phase case. Lagrangian particle statistics, such as the velocity probability density function and the velocity autocorrelation function, show minor differences among the three methods. However, major differences between the codes are observed in the evolution of the particle kinetic energy. These differences are related to the treatment of the initial condition when the particles are inserted in an initially single-phase turbulence. The averaged particle/fluid slip velocity is also analyzed, showing similar behavior as compared to the results referred in the literature. The computational performances of the different methods differ significantly. The VoF-Lag method appears to be computationally most expensive. Indeed, this method is not adapted to turbulent cases. The IBM and LBM-BB implementations show very good scaling. (C) 2018 Elsevier Ltd. All rights reserved.