In this study, in order to harvest energy from vortex-induced vibration of fluid flow, piezoelectric beams mounted behind a circular cylinder are considered and effect of various arrangements of the beams are studied. To reach this goal, a three-way coupling model in the turbulent, unsteady and viscous flow regime is numerically investigated. The simulations are investigated for different values of electrical resistance and its effect on vibration amplitude, frequency ratio, voltage and power output are compared. It has been shown that the maximum oscillation amplitude and frequency ratio is occurred by a resistance value of 1000 Ω and its value decreases with the increase of resistance. Furthermore, by growing of the load resistance, the generated voltage goes up significantly and the maximum voltage is obtained in the load resistance as 100 MΩ, Contrastingly, maximum power is obtained at low values of the load resistance. Finally, it is found that in the parallel arrangement of beams, due to less damping ratio due to stronger interaction between beams and shear layers, larger vibration amplitude and much more electrical output occurs.

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