https://perso.ensta-paris.fr/~doare

Affiliation: ENSTA Paris, Unit of Mechanical Engineering Associate Professor, École Polytechnique

Title: Fluid/flow damping on structures and dissipation-induced instabilities

Abstract:
A surrounding fluid is known to influence the dynamics of structures in various ways which, in a linear framework, are often modelled as added mass, damping, or stiffness.

In the first part of this talk, we will focus on fluid-induced dampings, from the classical ones such as viscous damping to less known aerodynamic damping, the latter possibly being negative, leading to dynamic instabilities such as drag of lift crisis instabilities.

In the second part of the talk, we will address some surprising dissipation-induced dampings that arise when the flow-structure interaction induces skew-symmetric stiffness or dissipation couplings.

Finally, the flow-structure energy exchanges that are implied will be looked at in the context of flow-energy harvesting, which has taken considerable interest in the last decades.