We present a segmented coupling model for slab casting by roller electromagnetic stirring(R‐EMS) of electromagnetic, flow, heat transfer, and solidification behavior based on magnetohy‐drodynamics and solidification theory. A three‐dimensional (3‐D) segmented coupling model that included electromagnetic, flow, and heat transfer elements was established using Ansoft Maxwell and ANSYS Fluent software. The effects of the roller sleeve, magnetic shielding ring, coil, core, mol‐
ten steel, and air domain on the electromagnetic, thermal and flow fields were studied numerically.