针对薄带连铸使用的中间包，建立了非稳态开浇和颗粒运动的耦合模型，计算了开浇过程中引流砂在中间包中的运动情况。计算过程中，分别考虑了两种尺寸分布的引流砂运动情况。同样数目颗粒分布的情况下，分别计算了两种引流砂的上浮率和每种颗粒直径引流砂的上浮情况。结果表明，该模型对于不同直径引流砂在中间包开浇过程中的运动具有很好的模拟效果，同时为钢包使用引流砂的直径范围提出参考。

The mathematical model of transient fluid flow coupled with particle movement was set up and applied to simulate packing sand movement in tundish. Two types of size distribution packing sand movement were analyzed and compared the relationship between size and floating frequency. It indicated that this model was suitable for simulating different size packing sand movement in tundish and also can be a reference for packing sand design.