Tuesday 8 September 2015
Energy harvesting using fluid-solid interactions
By Sébastien Michelin, Ecole Polytechnique, Palaiseau, France
Bio: Sébastien Michelin is currently an Associate Professor in Mechanics at Ecole Polytechnique, Palaiseau. He received his PhD in Mechanical and Aerospace Engineering at University of California, San Diego in 2009. He joined the Hydrodynamics Lab (LadHyX) and the faculty of the Department of Mechanics at Ecole Polytechnique. Since 2013, he is also the Deputy Director of the Hydrodynamics lab (LadHyX). His research interests are in the field of fluid-solid interactions, in particular focusing on problem related to energy harvesting from high-Re fluid flows or biological and bioinspired locomotion in Stokes flows.
Fluid-solid interactions and instabilities are able to generate spontaneous, self-sustained and large amplitude vibrations of structures placed in a steady flow. Often, these are sources of concerns because they can lead to fatigue and damage of engineering structures, such as offshore cables and risers. But these vibrations can also be used as a source of electrical energy when they are coupled to an electric generator. Understanding and modeling the non-linear dynamics of such vibrating structures is essential to properly assess how much power can be extracted using such systems. This presentation will focus on two main examples of classical fluid-solid instabilities, namely Vortex-Induced Vibrations of long and flexible structures and the flapping of flexible structures in axial flows (i.e. the flag instability). In both cases, the influence of energy extraction on the fluid-solid dynamics will be discussed as well as the energy harvesting efficiency and potential optimization strategies.
Webpage Prof. Sébastien Michelin
Organization Laboratory of Fluid Mechanics and Instabilities (LFMI)
Contact Prof. François Gallaire
Accessibility General public