Rigorous estimates of the tails of the probability distribution function for the random linear shear model

Jared C. Bronski, Richard M. McLaughlin

Research output: Contribution to journalArticle

Abstract

In previous work Majda and McLaughlin, and Majda computed explicit expressions for the 2Nth moments of a passive scalar advected by a linear shear flow in the form of an integral over RN. In this paper we first compute the asymptotics of these moments for large moment number. We are able to use this information about the large-N behavior of the moments, along with some basic facts about entire functions of finite order, to compute the asymptotics of the tails of the probability distribution function. We find that the probability distribution has Gaussian tails when the energy is concentrated in the largest scales. As the initial energy is moved to smaller and smaller scales we find that the tails of the distribution grow longer, and the distribution moves smoothly from Gaussian through exponential and "stretched exponential." We also show that the derivatives of the scalar are increasingly intermittent, in agreement with experimental observations, and relate the exponents of the scalar derivative to the exponents of the scalar.

Original languageEnglish (US)
Pages (from-to)897-915
Number of pages19
JournalJournal of Statistical Physics
Volume98
Issue number3-4
DOIs
StatePublished - Feb 2000

Keywords

  • Hamburger moment problem
  • Passive scalar intermittency
  • Turbulence

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics

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