An important technical characteristic is their ability to operate effectively in turbulent and gusty wind conditions, which expands the possibilities of their application in various climatic conditions. Theoretically, studies show that VAWTs are capable of achieving a power coefficient comparable to HAWTs, which opens up prospects for their wider application in the energy sector [15; 16]. The relevance of this study in the field of modeling and optimization of the Darrieus VAWT is due to several key factors of modern energy and technological development. The following paragraphs present an analysis of key research achievements in the field of studying and improving Darrieus turbines. The most significant works that have made a significant contribution to understanding the principles of operation and optimization of this type of wind turbines are considered. [PERSON] et al. conducted a numerical study on the effect of geometric parameters on the performance of the Darrieus VAWT using CFD and DMST methods. They found that increasing the number of blades improved the initial torque, but at high TSR, the efficiency decreased due to the flow interaction between the blades. Increasing the chord length to 0.09 m increased the power coefficient by 23% at low TSR, but the efficiency decreased at high rotation speeds. Introducing a 60\({}^{\circ}\) helical angle reduced the amplitude of torque oscillations, improving operational stability, and using a J-shaped blade profile increased the power coefficient by 19% at initial TSR, improving the self-starting of the turbine [17]. [PERSON] et al. conducted a 2D simulation of an H-shaped Darrieus turbine in ANSYS Fluent to evaluate the turbine performance at different wind speeds. They found that the maximum torque (0.9365 N m) and power (19.6658 W) were achieved at TSR = 0.9, after which the performance decreased. The turbine exhibited poor self-starting performance at low TSR due to the dominance of drag over lift. Using the k-\(\omega\) SST turbulence model, the flow behavior was accurately predicted and the design parameters were optimized [18]. [PERSON] et al. performed a performance analysis of VAWTs, which showed the influence of mesh density on turbine blade design, concluding that wind speed is directly related to stator design [19]. Research on straight-bladed vertical-axis wind turbines (VAWTs) highlights the influence of key design parameters such as chord length, rotor diameter, blade height, and blade number on the aerodynamic efficiency of turbines [20]. Researchers have found that symmetrical blade profiles such as NACA 0021 are popular for small turbines with power ratings below 10 kW due to their ability to operate in low wind speed conditions typical of urban and coastal environments [21]. Other studies focus on the dimensionless parameter to describe the ratio of the chord length to the circumference of the rotor, showing that the optimal ratio varies between 8-13% depending on the fixed rotor diameter or blade chord [22]. [PERSON] et al. [23] investigated the improvement of Darrieus rotor performance with asymmetric blades under low wind speed conditions (3-15 m/s). Wind tunnel experiments and numerical simulations using ANSYS Fluent showed that the addition of horizontal plates increased the torque by 18-22% at wind speeds of 3-6 m/s, enhancing self-starting ability and operational stability. The plates reduced vortex losses and increased the power coefficient (Cp), making the design promising for regions with low wind energy potential, although full-scale field testing is still required. [PERSON] et al. compared three-, four-, and five-bladed configurations based on the NACA 2412 profile using URANS equations and the SST k-\(\omega\) turbulence model. The results showed that the three-bladed configuration achieved the highest power coefficient (Cp), reaching 0.471 at a tip speed ratio (TSR) of 2.5, while the four-bladed and five-bladed configurations achieved Cp values of 0.372 and 0.207, respectively.