Transition to spatiotemporal chaos in a two-dimensional hydrodynamic system.
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.
Pirat
Christophe
C
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
Naso
Aurore
A
Meunier
Jean-Louis
JL
Maïssa
Philippe
P
Mathis
Christian
C