ABSTRACT Vortices at the meniscus of the continuous casting mould can entrain mould powder into the liquid pool. The entrained globules will form slivers in the subsequent downstream processing of the slabs. This article presents a three-dimensional computational study of the vortexing at the meniscus with an emphasis on capturing flow behaviours of vortices in continuous casting mould. We have used ANSYS FLUENT 19.2 a commercial CFD package. Two turbulence models, namely standard k- model and shear stress transport (SST) k- model, are employed in this work. The performance of the two turbulence models has been evaluated by comparing the flow measurements from 0.4-scale water model experiments. Both the turbulence models could capture vortices at the top surface. The transient vortex flow characteristics such as formation, expansion (and sustenance), thinning, merging and dissipation of the rotational flow are also predicted by the numerical simulations. In general, the standard k- model and the SST k- model exhibited good capability in predicting the complex, unsteady and turbulent vortex flow phenomena at the meniscus in continuous casting mould.

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水铸模具弯液面涡流模式的研究

摘要 连铸结晶器弯液面处的涡流可以将结晶器粉末带入液池中。夹带的小球将在随后的板坯下游加工中形成条子。本文介绍了弯月面涡流的三维计算研究，重点是捕捉连铸模具中涡流的流动行为。我们使用了商业 CFD 软件包 ANSYS FLUENT 19.2。在这项工作中采用了两种湍流模型，即标准 k 模型和剪切应力传输 (SST) k 模型。通过比较来自 0.4 比例水模型实验的流量测量值，评估了两种湍流模型的性能。两种湍流模型都可以捕获顶面的涡流。瞬态涡流特征如地层、数值模拟还预测了旋转流的膨胀（和维持）、变薄、合并和消散。总的来说，标准k-模型和SST k-模型在预测连铸模具弯液面处的复杂、不稳定和湍流涡流现象方面表现出良好的能力。