Ocean waves’ vast and boundless energy holds great potential as an untapped resource to meet our growing energy demands. Various wave energy converters (WECs) have been developed to harness wave power, with the oscillating water column (OWC) being a widely studied and prevalent model. The OWC operates by utilizing a submerged opening that allows the entry and exit of wave flows, creating a bi-directional airflow within a duct. This airflow then drives an air turbine, with the Wells turbine being commonly used in OWC systems. The Wells turbine is characterized by its untwisted, symmetrical blades perpendicular to the incoming airflow. It offers several advantages, including a simple design, high blade tip speed relative to the airflow, and maximum efficiency. However, it also has limitations, such as low torque at low airflow velocities, noisy operation, and a restricted operating range due to the stall phenomenon at higher airflow velocities. These drawbacks hinder the Wells turbine's ability to extract wave power effectively. This study aims to address the limitations of the Wells turbine by employing passive flow control devices, specifically various leading-edge cylinders. These devices are expected to enhance the turbine's operating range and power output. The performance characteristics of the turbine will be evaluated by solving three-dimensional, time-independent, incompressible Reynolds-averaged Navier-Stokes equations using the commercial CFD code Ansys-CFX. A grid convergence study assessed the discretization error and validated the numerical methodology. The results will be compared with experimental and numerical data to ensure accuracy and reliability.