Faraday instability in deformable domains
Hydrodynamic instabilities are usually investigated in confined geometries where the resulting spatiotemporal pattern is constrained by the boundary conditions. Here we study the Faraday instability in domains with flexible boundaries. This is implemented by triggering this instability in floating fluid drops. An interaction of Faraday waves with the shape of the drop is observed, the radiation pressure of the waves exerting a force on the surface tension held boundaries. Two regimes are observed. In the first one there is a coadaptation of the wave pattern with the shape of the domain so that a steady configuration is reached. In the second one the radiation pressure dominates and no steady regime is reached. The drop stretches and ultimately breaks into smaller domains that have a complex dynamics including spontaneous propagation.
G. Pucci, M. Ben Amar and Y. Couder. Faraday instability in floating drops. Phys. Fluids. 27, 091107 (2015). full text
G. Pucci. Faraday instability in floating drops out of equilibrium: motion and self-propulsion from wave radiation stress. Int. J. Non Linear Mech. 75: 107-114 (2015). full text
G. Pucci, M. Ben Amar and Y. Couder. Faraday instability in floating liquid lenses: the spontaneous mutual adaptation due to radiation pressure. J. Fluid Mech. 725, 402-427 (2013). full text
G. Pucci. Faraday instability in deformable domains. Il Nuovo Cim., 36 C n.4, 61-70 (2013). full text
G. Pucci, E. Fort, M. Ben Amar and Y. Couder. Mutual Adaptation of a Faraday Instability Pattern with its Flexible Boundaries in Floating Fluid Drops. Phys. Rev. Lett. 106, 024503 (2011). full text