Abstract:

he turbulent flow field generated in a baffled stirred tank with a Rushton turbine was computed by large eddy simulation（LES）.The dynamic subgrid model was used to model the unresolved scalesThe spatial discretization of the governing equations was performed on a cylindrical staggered gridThe momentum and continuity equations were discretized by the finite difference method with a third order QUICK scheme for the convective termsThe interaction between rotating impeller and static baffles was accounted for through the improved innerouter iterative algorithmThe phaseresolved predictions were compared with the experimental data of references and good agreement was observed both for mean resolved fields and turbulence quantities.

摘要： 采采用大涡模拟湍流模型对有档板的Rushton 桨搅拌槽进行了数值模拟研究。控制方程采用控制容积法进行离散，对流项用三阶QUICK格式，扩散项是二阶中心差分。压力速度耦合方程在交错网格上采用SIMPLE算法进行求解。小尺度流动的模化采用动力学（dynamic）亚格子模型。搅拌桨与档板之间的相互作用采用改进的内外迭代法进行处理。计算结果和文献值吻合得很好。