Chord length was evaluated at three levels, 0.1, 0.15 and 0.2 m, number of blades 2, 3 and 4, Height to Diameters (H/D) ratio of 0.5, 1, 1.5 and 2, and four types of airfoils, NACA0012, NACA0018, NACA4412 and NACA4418. First, the model outcome was validated based on experimental results and then, the performances of 144 different turbine types were simulated with respect to chord length, number of blades, H/D ratio and airfoil type. In this study, using the aforementioned model, the appropriate range of important wind turbine design parameters was determined. The appropriate correlation between the Double Multiple Stream Tube (DMST) model and the experimental results has led researchers to pay distinct attention to this model for vawt simulation. Investigating the performance of this type of turbine is an interesting topic for researchers. Among the tools used for converting wind energy was the vertical-axis wind turbine (vawt). The use of wind energy can be traced back thousands of years to many ancient times. The feasibility of the active control technique is finally discussed, demonstrating its potential as an effective solution for the performance augmentation of the Darrieus turbine. TSR = 2, the power coefficient of the SC turbine is almost double that of the BL turbine. For the selected test case, the net maximum predicted power coefficient is 0.435 for the SC turbine at TSR = 2.3, 0.375 for the baseline at TSR = 2.6. The turbine with suction cavity airfoils (SC) shows a higher power coefficient than the one with baseline airfoil (BL) blades, especially at low tip-speed ratios. The effect of suction momentum ratio Cμ on the performance of the turbine is investigated. High-fidelity Computational Fluid Dynamics (CFD) simulations are used after validation against experimental results. A cavity is created on the airfoil's suction side, where suction is applied to create a trapped vortex. This study evaluates an active boundary layer control technique to increase the aerodynamic efficiency of Darrieus VAWTs. Enhancing the performance of Darrieus Vertical Axis Wind Turbines (VAWTs) is the key to boost their possible commercialisation in the yet highly competitive wind energy market.