连铸中间包内三维湍流流动的数值模拟

NUMERICAL SIMULATION OF THREE-DIMENSIONAL TURBULENT FLOW IN CONTINUOUS CASTING TUNDISHES

连铸中间包的操作条件决定了其内流动现象的复杂性，为此，本文选择两种不同的湍流模型k-ε和LES（Largeeddysimulation），建立了描述连铸中间包内三维湍流流动的数学模型，并实施了数值计算和模型验证，对单流中间包内的流动现象进行了描述，考察了有、无流动控制情况下中间包内的流动特征和湍流模型的合理性.结果表明，合理的流动控制有利于中间包内非金属夹杂的上浮和吸附，用k-ε模型基本上能够描述中间包内的流动现象，LES则能描述用k-ε模型所不能很好描述的现象。

A Mathematical model to describe three-dimensional turbulent flow in continuous casting tundishes has been developed by choosing two different types of turbulent model as k-εand LES(Large eddy simulation).Numerical calculations have been performed to study the characteristics of flow in the tundish without/with now control,and the reasonability of the turbulent models has been discussed.The results show that the proper flow control is in favor of inclusions floating in the tundish;basically, the phenomena of flow in the tundish can be described by using traditional k-εmodel, however,the phenomena which could not be well calculated by k-εmodel can be described by using LES.