As global development continues and the population rises, the demand for energy increases. Fossil fuels currently play a major role in energy production but contribute to environmental pollution. Meanwhile, there is a global push, supported by the United Nations, to achieve zero carbon dioxide and air pollution emissions. Embracing renewable energy has become increasingly critical in this context. Wind energy typically harnessed through wind turbines and other wind-harvesting devices, is one of the most prominent examples of renewable energy. Energy harvesting through flow-induced vibration (FIV) has found applications in various sectors, including civil infrastructure, power transmission lines, and emerging areas such as long-distance transport pipelines. This method allows the kinetic energy of wind to be converted into electricity, providing a continuous power source for sensors and other devices, thereby facilitating the remote monitoring and management of pipelines at a reduced cost. This paper seeks to identify the shape characteristics of flow-around structures that enhance FIV, aiming to provide design guidelines for the geometric configuration of energy harvesters. Through both numerical and experimental methods, this study examines the wake region flow structure of smooth cylinders and cylinders equipped with petals of varying heights and angles. The findings demonstrate that the proposed new shape for cylinders significantly improves energy harvesting efficiency.