title: Self-similar formation of an inverse cascade in vibrating elastic plates.
abstract: The dynamics of random weakly nonlinear waves is studied in the framework of vibrating thin elastic plates. Although it has been previously predicted that no stationary inverse cascade of constant wave action flux could exist in the framework of wave turbulence for elastic plates, we present substantial evidence of the existence of a time-dependent inverse cascade, opening up the possibility of self-organization for a larger class of systems. This inverse cascade transports the spectral density of the amplitude of the waves from short up to large scales, increasing the distribution of long waves despite the short-wave fluctuations. This dynamics appears to be self-similar and possesses a power-law behavior in the short-wavelength limit which significantly differs from the exponent obtained via a Kolmogorov dimensional analysis argument. Finally, we show explicitly a tendency to build a long-wave coherent structure in finite time.
authors.affiliation: Facultad de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago, Chile.
authors.forename: Gustavo
authors.initials: G
authors.lastname: Düring
authors.affiliation: Sorbonne Universités, CNRS & UPMC Univ Paris 06, UMR 7190, Institut d'Alembert, F-75005, Paris, France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Josserand
authors.affiliation: Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Avda. Diagonal las Torres 2640, Peñalolén, Santiago, Chile.
authors.forename: Sergio
authors.initials: S
authors.lastname: Rica