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The formation of macrosegregation in high grade steel ingots cast in sand molds with and without watercooled copper tube is simulated by solving macroscopic mass, momentum, species and energy conservation equations. Predicted macrosegregation pattern in the ingots compares well with the experimental data. Both calculations and experiments reveal that the ingot cast with water-cooled copper tube has the following characteristics; less intensive macrosegregation, vertical A-segregation band and a larger negative-segregation zone at the bottom. Mechanisms of macrosegregation formation are numerically analyzed. Detailed explanations regarding the influences of fluid fbw and temperature change upon the formation of the segregations are provided.