Subgrid modeling in particle-laden channel flow
Subgrid modeling in particle-laden channel flow
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DOI：
10.1063/1.2176589
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发表时间：
2006-02
影响因子：
4.6
通讯作者：
Jgm Hans Kuerten
中科院分区：
文献类型：
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作者：
Jgm Hans Kuerten
采用直接数值模拟（DNS）和大涡模拟（LES）方法，研究了两种亚网格模型和多种雷诺数和斯托克斯数下颗粒在槽道中受拖曳力作用的湍流流动。在这种流动中，湍流电泳导致颗粒在壁附近积聚。这项工作的目标是调查的准确性的亚网格模型研究相对于粒子的行为，并解释所观察到的粒子行为预测的不同的模型。重点是颗粒分散和垂直于通道壁方向的平均颗粒运动。对于一个低雷诺数，它示出的turbophoresis和颗粒速度波动减少相比，DNS，如果过滤后的流体速度计算的LES中使用的颗粒运动方程。这是忽略流体速度中的亚网格尺度和亚网格模型不足的综合效应。更好的协议与DNS是obt.
Direct numerical simulation (DNS) and large-eddy simulation (LES) of particle-laden turbulent channel flow, in which the particles experience a drag force, are investigated for two subgrid models and several Reynolds and Stokes numbers. In this flow, turbophoresis leads to an accumulation of particles near the walls. The objectives of the work are to investigate the accuracy of the subgrid models studied with respect to particle behavior and to explain the observed particle behavior predicted by the different models. The focus is on particle dispersion and mean particle motion in the direction normal to the walls of the channel. For a low Reynolds number, it is shown that the turbophoresis and particle velocity fluctuations are reduced compared to DNS, if the filtered fluid velocity calculated in the LES is used in the particle equation of motion. This is a combined effect of the disregard of the subgrid scales in the fluid velocity and the inadequacy of the subgrid model. Better agreement with DNS is obt...