A comparative study was conducted using computational fluid dynamics between two models of resonant bladeless wind generators having similar mass and material in order to study the effect resulting from the design profile on the aerodynamic performance, the frequency response, and then its impact on the power generated. Fluid structure interaction numerical modelling was performed using Ansys 16.1 software, by first modelling the flow field around the generator using the Large Eddy simulation turbulence pattern and then calculating the forces acting on the body and the frequencies of the vibration of the vortices . The analyses linking with the body by analyzing the mutual interaction between the fluid and the body using one-way fluid-structure interaction coupling with to study the vibrations resulting from the vortices and hence the energy can be produced from them. The study showed an improvement in the aerodynamic performance of the second modified model compared to the first, as the lift coefficient increased by 49.3%, while the drag coefficient decreased by 34%. On the other hand, the frequency ratio decreased in the second model by 2.3%, and this led to a significant increase in generated power in the second model compared to with the first one.