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Hydrodynamic instabilities are usually investigated in confined geometrieswhere the resulting spatiotemporal pattern is constrained by the boundaryconditions. Here we study the Faraday instability in domains with flexibleboundaries. This is implemented by triggering this instability in floatingfluid drops. An interaction of Faraday waves with the shape of the drop isobserved, the radiation pressure of the waves exerting a force on the surfacetension held boundaries. Two regimes are observed. In the first one there is acoadaptation of the wave pattern with the shape of the domain so that a steadyconfiguration is reached. In the second one the radiation pressure dominatesand no steady regime is reached. The drop stretches and ultimately breaks intosmaller domains that have a complex dynamics including spontaneous propagation.

Mutual adaptation of a Faraday instability pattern with its flexible boundaries in floating fluid drops