The turbulent schmidt number

Diego A. Donzis, Konduri Aditya, K. R. Sreenivasan, P. K. Yeung

Research output: Contribution to journalArticle

Abstract

We analyze a large database generated from recent direct numerical simulations of passive scalars sustained by a homogeneous mean gradient and mixed by homogeneous and isotropic turbulence on grid resolutions of up to 40963 and extract the turbulent Schmidt number over large parameter ranges: the Taylor microscale Reynolds number between 8 and 650 and the molecular Schmidt number between 1/2048 and 1024. While the turbulent Schmidt number shows considerable scatter with respect to the Reynolds and molecular Schmidt numbers separately, it exhibits a sensibly unique functional dependence with respect to the molecular Péclet number. The observed functional dependence is motivated by a scaling argument that is standard in the phenomenology of threedimensional turbulence.

Original languageEnglish (US)
Article number061210
JournalJournal of Fluids Engineering, Transactions of the ASME
Volume136
Issue number6
DOIs
StatePublished - Jun 2014

ASJC Scopus subject areas

  • Mechanical Engineering

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