Fluid-solid-electric couplings of piezoelectric flags

Abstract eng:
Flow-induced vibrations such as the flag instability can be used to harvest energy from fluid flows when coupled to an electric generator (e.g. piezoelectric materials). Focusing on piezoelectric flags, we investigate here the coupling of the fluid-solid mechanical system to the electric output circuit, and resulting energy transfers. In particular, a new fluid-solid-electric lock-in mechanism is identified that greatly enhances the harvesting efficiency of the system. Finally, we investigate the synchronization of two piezoelectric flags under the combined effect of hydrodynamic and electrodynamic interactions.

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