Predictions for flow and residence time in a draft tube reactor were investigated using momentum source, Multiple Reference Frame (MRF) and sliding mesh approaches together with the Stress Blended Eddy Simulation (SBES) turbulence model. Predictions of mean and fluctuating velocities in the annulus, and the exit residence time distribution, are found to be similar and in close agreement with experimental data with all impeller modelling approaches, confirming that the flow in the bulk of the vessel is dominated by the turbulence generated at the draft tube exit and is relatively insensitive to the small-scale turbulence generated by the impeller. On consideration of both accuracy and computational cost, momentum source and MRF approaches offer significant advantages for industrial simulation in this geometry. The SBES model is found to work well in a complex internal flow geometry with an impeller, negating the need for simplifications like zonal LES approaches.

使用动量源、多参考框架 (MRF) 和滑动网格方法以及应力混合涡流模拟 (SBES) 湍流模型研究了对尾流管反应器中的流动和停留时间的预测。发现环空中的平均速度和波动速度以及出口停留时间分布的预测与所有叶轮建模方法的实验数据相似，并且与实验数据非常一致，证实容器中的大部分流动受湍流支配在尾水管出口处产生，对叶轮产生的小尺度湍流相对不敏感。考虑到精度和计算成本，动量源和 MRF 方法为这种几何形状的工业模拟提供了显着的优势。