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The slag entrapment process under two different initial conditions during the end of casting in tundish is studied. A 3D multiphase mathematical model was developed to simulate the slag entrapment behaviour. The critical slag entrapment time (t s ) and the corresponding critical slag entrapment height (h cs ) were predicted. The results show the h cs increases, the t s decreases as the casting speed increases, but their relationships are not linear. The influence of casting speed on the h cs in the range of 1.25-1.5 m min −1 is higher than other ranges. The h cs simulated from the steady flow field is higher than that from the static state. When the casting speed is 1.50 m min −1 , the difference between the h cs calculated from two different initial conditions is the largest, reaching 9.83 mm (8.42%). The numerical simulation results are verified by a 1:2 scaled water model.

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