When placed in a fluid flowing with a certain critical speed, bluff bodies can undergo vortex-induced vibrations. These vortex-induced vibrations can be harnessed for conversion of fluid energy into electrical energy. Here, a cantilever beam with a cylindrical tip and a piezoelectric patch attached to the base of the cantilever is considered. The structure is placed in fluid flow. Experiments with two such bluff body oscillators placed in close proximity show an amplified response that can be attributed to the interaction between the wakes of the cylinders. This results in an enhanced power output. In this work, the authors model and simulate single and two oscillator systems by using finite element models for fluid-structure interactions. For the single oscillator, results from a wake oscillator based reduced order model are used to compare and verify the finite element simulation results. For the coupled oscillator case, the effect of varying the gap to diameter (G/D) ratio on the response is analysed. System dynamics and the potential for energy harvesting are discussed.