标题： 湍流模型和颗粒法对弥散两相旋流流动的影响 显示英文标题

标题： Effects of Turbulence Modeling and Parcel Approach on Dispersed Two-Phase Swirling Flow

摘要： 对垂直圆形管道内的共轴含颗粒旋转气流进行了若干数值模拟。 气流采用非定常 Favre 平均 Navier-Stokes 方程建模。 颗粒运动采用了拉格朗日模型。 通过双向动量交换将气体与颗粒耦合。 比较了三种 k-ε 湍流模型（标准、重正规化群 (RNG) 和可实现的）的模拟结果与实验平均速度分布。 标准模型总体表现最佳。 可实现的模型无法令人满意地预测径向速度；它也是计算成本最高的模型。 使用 RNG 模型的模拟预测了额外的回流区。 我们还比较了解决颗粒运动问题时的颗粒和包裹方法。 在后者中，多个相似颗粒被分组在一个包裹内，从而减少了计算量。 显示英文摘要

摘要： Several numerical simulations of a co-axial particle-laden swirling air flow in a vertical circular pipe were performed. The air flow was modeled using the unsteady Favre-averaged Navier-Stokes equations. A Lagrangian model was used for the particle motion. The gas and particles are coupled through two-way momentum exchange. The results of the simulations using three versions of the k-epsilon turbulence model (standard, re-normalization group (RNG), and realizable) are compared with experimental mean velocity profiles. The standard model achieved the best overall performance. The realizable model was unable to satisfactorily predict the radial velocity; it is also the most computationally-expensive model. The simulations using the RNG model predicted additional recirculation zones. We also compared the particle and parcel approaches in solving the particle motion. In the latter, multiple similar particles are grouped in a single parcel, thereby reducing the amount of computation.