Abstarct: Vortex Induced Vibration (VIV) is called to bluff bodies that interact with outer fluid flow upon them. In this circumstance a sinusoidal Lift force works on body. If it is tied, vortex shedding frequency follows Stohal’s law, but if it baxsed on elastic baxse, the body moves by the force lead that. This phenomena was known as a destructive phenomenon but in recent years it known as a new renewable sort of energy. The studies about this subject is usually about to structures desinging and with attitude to reduce the amplitude and find a safe region of designing structures. While the new studies about this phenomenon is about to extract clean an sustainable energy started by Bernitsas in 2005 and subjects like dependency to Reynolds number and spring systems and damping and even energy extraction of air are studied. In this thesis, by simulating this phenomenon in OpenFOAM CFD code and using the results of simulating like amplitude and lift force to calculate in order to understand how much energy can be extract by this prototype, and evaluating the technical and economical parameter in this type of energy harvesting. It have been seen that by increasing the Reynolds number from 100 to 110 a rapid jump happened and this jump continued until Reynolds 120 that is ideal region for extracting energy. Although in in Reynolds number between 100 and 300 in frequency ratio between 0/8 and 1/2 because of resonance phenomenon the maximum amplitude is seen. In comparsion of different cylinder sectional geometry(circular, cubic and rhombic) the maximum amplitude is for cylinder with circular section, then it is the best choice for harvesting energy issue while rhombic cylinder is better to be used in structural applicants.