D.Edgar MatidaD.Fred Nitzsche2026-06-082026-06-08https://dspace.academy.edu.ly/handle/123456789/2226the aerodynamic performance (power coe cient) of the novel design (STS-VAWT) with that of a conventional design (based on troposkien shape VAWTs from Sandia National Laboratory). In this study, two sets of prototype turbines were designed, built, and tested. The rst set consisted of three di erent con gurations of VAWT (conventional, novel 50%, and novel 100% STS-VAWT) designed to operate in a medium Tip Speed Ratio (TSR) regime (4 < < 6), where the BVI e ect is strong. TSR is the ratio of the blade velocity (at the equator) to the wind velocity. Whereas, the second set of two prototype turbines, which consisted of the conventional and 50% STS models, were designed to run at low TSR ( < 4), where the BVI e ect is minimal. To maintain consistent comparisons between the prototypes, the turbines of each set were fabricated using the same rotor parameters (i.e. overall heightWith the world's growing energy demand, the need for o shore wind turbine installations in water depths greater than 50 meters has become a strategic priority for the wind energy market. In deep water sites, Vertical Axis Wind Turbines (VAWTs), particularly with curved rotor blades, may provide more than a 20% reduction in costs (i.e. installation and maintenance) when compared to standard HAWTs (Horizontal Axis Wind Turbines). However, VAWTs have su ered from an intrinsic de ciency rooted in the complex aerodynamic behaviour of the turbine due to Blade-Vortex Interactions (BVIs) during normal turbine operation. To overcome this performance limitation, a novel VAWT design that decreases the BVI e ects is proposed. The key concept behind this design focused on vertically shifting the position of one blade with respect to the second blade, herein named Shifted Troposkien Shape VAWT (STS-VAWT).Numerical Studies of Aerodynamic Performance