Two-phase flow LES of the sedimentation process of a particle cloud
Two-phase flow LES of the sedimentation process of a particle cloud
复制标题
粒子云沉降过程的两相流 LES
DOI：
10.1080/00221686.2012.737375
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
N. and Gotoh
中科院分区：
文献类型：
--
作者：
Harada;E.;Tsuruta;N. and Gotoh
为了高分辨率地预测实际的沉积过程，进行了大涡模拟。建立了基于欧拉-拉格朗日耦合的固液两相流模型。然后应用离散单元法计算了单个颗粒运动过程中的颗粒间作用力。欧拉流体方法的计算网格尺度小于颗粒直径，以模拟由沉降颗粒引起的尾流。颗粒沉降过程的模拟和实验结果的比较验证了所开发的数值模型的性能。最后，从计算的角度研究了沉降颗粒内部结构的机理。结果表明，双能产生率与粒子间碰撞之间存在正相关关系。
To predict the sedimentation process practically with high resolution, a large eddy simulation (LES) is performed. A solid/liquid two-phase flow model based on the Euler–Lagrange coupling is developed. Then the discrete element method is applied to calculate inter-particle forces during individual particle motion. The computational grid scale of the Eulerian fluid method is less than the particle diameter to simulate a wake induced by settling particles. Comparison of the simulated and experimental results for the particle sedimentation process verified the performance of the developed numerical model. Finally, the mechanism of the inner structure of the settling particles is investigated from a computational point of view. Consequently, the positive relationship between the turbulence-energy production rate and the inter-particle collisions would be shown.