Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session G14: Aerodynamics: Fluid Structure Interaction II
10:35 AM–12:45 PM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B301
Chair: David MacPhee, The University of Alabama
Abstract ID: BAPS.2018.DFD.G14.1
Abstract: G14.00001 : Fluid-Structure Instabilities in Flow Energy Harvesting Applications*
10:35 AM–10:48 AM
Presenter:
Benedikt Dorschner
(California Institute of Technology)
Authors:
Benedikt Dorschner
(California Institute of Technology)
Luis Phillipe Tosi
(California Institute of Technology)
Tim Colonius
(California Institute of Technology)
Building fully autonomous and self-sustained electronic devices requires reliable in-situ power generation methods. A robust and promising approach is energy harvesting using fluid kinetic energy as its source. Among various proposed transduction mechanisms, we will focus on vibration-based piezoelectricity due to its robustness, high power density and electro-mechanical coupling efficacy. When coupled to fluid flow, exploiting fluid-structure instabilities to maintain self-sustained oscillations for consistent power output has shown to be an effective harvesting strategy. In this contribution, we will investigate the stability properties of an energy harvester design based on a piezoelectric beam, which is placed in a converging-diverging channel configuration. Using fully coupled three-dimensional direct numerical simulations of the fluid-structure interaction problem, we will deduce and validate a quasi one-dimensional model of the system based on leakage-flow type instability. This eventually allows us to identify the main mechanisms of fluid-induced vibration, which will be paramount for designing next-generation energy harvesters.
*This work is supported by the SNF grant P2EZP2_178436 and the Bosch BERN program.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.G14.1
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