Fluid-Solid-Electric Lock-In of Energy-Harvesting Piezoelectric Flags

International audienceThe spontaneous flapping of a flag in a steady flow can be used to power an output circuit usingpiezoelectric elements positioned at its surface. Here, we study numerically the effect of inductive circuits on the dynamics of this fluid-solid-electric system and on its energy-harvesting efficiency. In particular, a destabilization of the system is identified, leading to energy harvesting at lower flow velocities. Also, a frequency lock-in between the flag and the circuit is shown to significantly enhance the system’s harvesting efficiency. These results suggest promising efficiency enhancements of such flow-energy harvesters through the output circuit optimization