Etude numérique et modélisation de la modulation de la turbulence dans un écoulement de nappe chargée en particules. (Numerical study and modelling of turbulence modulation in a particle laden slab flow)
Etude numérique et modélisation de la modulation de la turbulence dans un écoulement de nappe chargée en particules. (Numerical study and modelling of turbulence modulation in a particle laden slab flow)
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DOI：
10.1088/1468-5248/4/1/025
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发表时间：
2003-08
影响因子：
1.9
通讯作者：
O. Vermorel
中科院分区：
文献类型：
--
作者：
O. Vermorel
本文介绍了一种数值和理论研究的平均和湍流相间动能转移的气体颗粒流中使用的连续相的直接数值模拟，直接解决所有的湍流尺度的流体流动，再加上拉格朗日预测的离散颗粒的轨迹。该配置对应于以高速注入到各向同性衰减湍流中的颗粒板。与湍流长度尺度相比，颗粒较小，分散相的体积分数较低。首先考虑的计算技术的局限性，其准确性进行评估的动能和耗散率预算的分析。颗粒和气体之间的动量传递导致板状区域中的颗粒对流体的强烈加速，并且由于平均气体速度梯度的产生而增强了周边处的湍流。本文还分析了两相流的相间传递项。
This paper describes a numerical and theoretical study of the mean and turbulent interphase kinetic energy transfer in gas–particle flows using direct numerical simulation for the continuous phase, that directly resolves all the turbulent scales of the fluid flow, coupled with a Lagrangian prediction of trajectories of discrete particles. The configuration corresponds to a slab of particles injected at high velocity into an isotropic decaying turbulence. The particles are small compared to the turbulent length scale and the volume fraction of the dispersed phase is low. The limitations of the computational technique are first considered and its accuracy is evaluated by analysis of the kinetic energy and dissipation rate budgets. The momentum transfer between particles and gas causes a strong acceleration of the fluid by the particles in the slab region and enhances the turbulence at the periphery due to the production by the mean gas velocity gradients. The analysis of the interphase transfer terms in the...