The SFT (swirling flow tundish) is a tundish with swirl chamber placed in the flow injection zone. The gravitational potential energy is converted into swirling kinetic energy as the liquid steel flows into the tundish from the bottom of the SC (swirling chamber) through a nozzle along the tangent direction. The swirling molten steel promotes the inclusions to gather towards the center of the swirling chamber, promoting the inclusions to collide and polymerize. In this work, the PBM model in ANSYS Fluent was used to simulate the growth of inclusions in SFT, the DPM model was used to simulate the removal rate and trajectory of different particle size inclusions. Simulation results showed that the average diameter of inclusions in the tundish without swirling chamber increased from 3.93 μm to 4.25 μm and the inclusion removal rate was 40.07% considering the collision polymerization between inclusions. Under the same operating conditions, the average diameter of inclusions in swirling flow tundish increased from 3.93 μm to 4.35 μm, and the removal rate of inclusions increased from 30.09% to 43.20%. The removal capacity of SFT was better than that of NSCT (non-swirling chamber tundish).