Wave turbulence theory of elastic plates

PHYSICA D-NONLINEAR PHENOMENA

卷:347

Article

During, Gustavo¹  Josserand, Christophe^2,3  Rica, Sergio^4,5 

[1] Pontificia Univ Catolica Chile, Fac Fis, Casilla 306, Santiago, Chile

[2] Sorbonne Univ, CNRS, F-75005 Paris, France

[3] UPMC Univ Paris 06, Inst Alembert, UMR 7190, F-75005 Paris, France

[4] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Avda Diagonal Torres 2640, Santiago, Chile

[5] Univ Adolfo Ibanez, UAI Phys Ctr, Santiago, Chile

关键词: Wave turbulence;    Elastic plates;    Kinetic equation;    Numerical simulations;   

DOI  :  10.1016/j.physd.2017.01.002

来源: Elsevier

【 摘 要 】

This article presents the complete study of the long-time evolution of random waves of a vibrating thin elastic plate in the limit of small plate deformation so that modes of oscillations interact weakly. According to the wave turbulence theory a nonlinear wave system evolves in longtime creating a slow redistribution of the spectral energy from one mode to another. We derive step by step, following the method of cumulants expansion and multiscale asymptotic perturbations, the kinetic equation for the second order cumulants as well as the second and fourth order renormalization of the dispersion relation of the waves. We characterize the non-equilibrium evolution to an equilibrium wave spectrum, which happens to be the well known Rayleigh-Jeans distribution. Moreover we show the existence of an energy cascade, often called the Kolmogorov-Zakharov spectrum, which happens to be not simply a power law, but a logarithmic correction to the Rayleigh Jeans distribution. We perform numerical simulations confirming these scenarii, namely the equilibrium relaxation for closed systems and the existence of an energy cascade wave spectrum. Both show a good agreement between theoretical predictions and numerics. We show also some other relevant features of vibrating elastic plates, such as the existence of a self-similar wave action inverse cascade which happens to blow-up in finite time. We discuss the mechanism of the wave breakdown phenomena in elastic plates as well as the limit of strong turbulence which arises as the thickness of the plate vanishes. Finally, we discuss the role of dissipation and the connection with experiments, and the generalization of the wave turbulence theory to elastic shells. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free