The formation and removal of exogenous inclusions in a real-size two-strand tundish is simulated by the proposed unsteady 3D comprehensive numerical model of the respective fluid-structure interaction, which takes into account the impacting and washing effects on the refractory wear. A large eddy simulation is employed to describe the molten steel vortex flow. Thus, the thermal profiles of the molten steel and refractory lining are constructed. One-way coupled unsteady Euler-Lagrange approach is adopted to estimate the detachment and motion of the exogenous inclusion. The inclusion’s Reynolds number is utilized for evaluating the inclusion separation at the refractory lining after formation and at the upper surface of the molten steel. At a 1.2 m/min casting speed, 49 and 38 pct of exogenous inclusions are created at the turbulent inhibitor inner bottom and long nozzle inner wall, respectively. In contrast, only 13 pct of new inclusions are produced at all other inner walls. About 80 pct of newly generated inclusions are then trapped by free surfaces, 78 pct of which are removed at the first free surface. The initial diameter of exogenous inclusions ranges from 13 to 48 μm. The removal ratio of exogenous inclusions in the tundish first grows from 61 to 80 pct, with the casting speed rising from 1.0 to 1.2 m/min and then drops to 63 pct after the further casting speed rise to 1.4 m/min.

实际尺寸的两链中间包中外生夹杂物的形成和去除是通过提出的有关流体-结构相互作用的非稳态3D综合数值模型来模拟的，该模型考虑了耐火材料磨损的影响和冲刷效果。采用大涡模拟来描述钢水涡流。因此，构造了钢水和耐火衬里的热分布。采用单向耦合非定常欧拉-拉格朗日方法来估计外生夹杂物的脱离和运动。夹杂物的雷诺数用于评估形成后的耐火衬里和钢水上表面的夹杂物分离。以1.2 m / min的铸造速度，在湍流抑制剂内底和长喷嘴内壁分别产生了49％和38％的外源夹杂物。相比之下，在所有其他内壁上仅产生了13％的新夹杂物。然后大约80 pct新生成的内含物由自由表面困住，其中的78 pct在第一自由表面被去除。外生夹杂物的初始直径为13至48 μ微米。中间包中外来夹杂物的去除率首先从61增加到80 pct，铸造速度从1.0上升到1.2 m / min，然后在进一步铸造速度上升到1.4 m / min之后下降到63 pct。