Stochastic linearization of turbulent dynamics of dispersive waves in equilibrium and non-equilibrium state

Shixiao W. Jiang, Haihao Lu, Douglas Zhou, David Cai

Research output: Contribution to journalArticle

Abstract

Characterizing dispersive wave turbulence in the long time dynamics is central to understanding of many natural phenomena, e.g., in atmosphere ocean dynamics, nonlinear optics, and plasma physics. Using the β-Fermi-Pasta-Ulam nonlinear system as a prototypical example, we show that in thermal equilibrium and non-equilibrium steady state the turbulent state even in the strongly nonlinear regime possesses an effective linear stochastic structure in renormalized normal variables. In this framework, we can well characterize the spatiotemporal dynamics, which are dominated by long-wavelength renormalized waves. We further demonstrate that the energy flux is nearly saturated by the long-wavelength renormalized waves in non-equilibrium steady state. The scenario of such effective linear stochastic dynamics can be extended to study turbulent states in other nonlinear wave systems.

Original languageEnglish (US)
Article number083028
JournalNew Journal of Physics
Volume18
Issue number8
DOIs
StatePublished - Aug 2016

Keywords

  • B-Fermi Pasta Ulam chain
  • Effective linear stochastic structure
  • Long-wavelength renormalized waves
  • Nonequilibrium steady state

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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