Non-Gaussian buoyancy statistics in fingering convection

Jost von Hardenberg, Francesco Paparella

Research output: Contribution to journalArticle

Abstract

We examine the statistics of active scalar fluctuations in high-Rayleigh number fingering convection with high-resolution three-dimensional numerical experiments. Marked non-Gaussian tails are found in the one-point distribution of buoyancy fluctuations. A modified theory based on an original approach by Yakhot (1989) is used to model the active scalar distributions as a function of the conditional expectation values of scalar dissipation and fluxes in the flow. Simple models for these two quantities highlight the role of blob-like coherent structures for scalar statistics in fingering convection.

Original languageEnglish (US)
Pages (from-to)2646-2653
Number of pages8
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Volume374
Issue number26
DOIs
StatePublished - Jun 7 2010

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Keywords

  • Doubly-diffusive convection
  • Salt fingers

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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