Enhancing <scp>S</scp> avonius turbine performance via novel concave‐side blade designs

Abstract Wind energy is crucial in the worldwide shift to renewable power and cutting greenhouse gas outputs. This study investigates the aerodynamic performance of a Savonius‐type vertical‐axis wind turbine (VAWT) by introducing novel blade geometries parameterized by three control variables that modify the concave surface of the rotor. Each configuration was evaluated through steady‐state numerical simulations in ANSYS Fluent under identical operating conditions. The results demonstrate that variations in blade shape markedly affect airflow patterns and enhance the turbine's power output efficiency, particularly under high tip‐speed ratios. All proposed designs outperform the conventional blade, and case 4 delivers the highest gain with a 17.93% increase in power coefficient at a tip speed ratio of 1.1. These findings underline the essential importance of accurate blade refinement in maximizing efficiency and offer valuable guidance for the development of high‐performance, small‐scale wind energy systems.