Abstract: Reducing electric energy consumption of an aluminum reduction cell requires shortening of the anode-cathode distance (ACD), which requires a lower magnitude of liquid aluminum wave. A mathematical model of electrolyte/aluminum two-phase flow in reduction cells, based on a computational fluid dynamics (CFD) method and the commercial software Fluent, was developed to study the impact of the cathode convex on the electrolyte/aluminum interface wave. The magnitude of the two-phase interface wave was reduced 17.2% for cathode convexes, while also enhancing washout of the melt on the ledge.