High turbulence at the liquid steelÀmold flux interface results in mold flux entrapments, which can generate nonmetallic inclusions during the ingot-casting process. Those nonmetallic inclusions are detrimental to the final steel quality. The teeming process during ingot casting is typically conducted using the uphill teeming method. The authors propose a novel alternative method using a side teeming process, which decreases turbulence at the free surface. To define the optimum operational conditions, a 3D mathematical model is developed to investigate the effect of the filling angle on the motion of the free surface and the resulting shear stresses during the teeming process. The investigated filling angles are 0 , 30 , 45 , 60 , and 90 . The present findings suggest that using the filling angle of 90 between the mold and the runner is an effective way of reducing the number of inclusions due to mold flux entrapments and refractory wear.