title: Transition to spatiotemporal chaos in a two-dimensional hydrodynamic system.
abstract: We study the transition to spatiotemporal chaos in a two-dimensional hydrodynamic experiment where liquid columns take place in the gravity induced instability of a liquid film. The film is formed below a plane grid which is used as a porous media and is continuously supplied with a controlled flow rate. This system can be either ordered (on a hexagonal structure) or disordered depending on the flow rate. We observe, for the first time in an initially structured state, a subcritical transition to spatiotemporal disorder which arises through spatiotemporal intermittency. Statistics of numbers, creations, and fusions of columns are investigated. We exhibit a critical behavior close to the directed percolation one.
authors.affiliation: Institut du Non Linéaire de Nice (UMR CNRS 6618), Université de Nice Sophia Antipolis, 1361 Route des Lucioles, F-06560 Valbonne, France. Christophe.Pirat@inln.cnrs.fr
authors.forename: Christophe
authors.initials: C
authors.lastname: Pirat
authors.forename: Aurore
authors.initials: A
authors.lastname: Naso
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Meunier
authors.forename: Philippe
authors.initials: P
authors.lastname: Maïssa
authors.forename: Christian
authors.initials: C
authors.lastname: Mathis