Structure function scaling in a Reλ = 250 turbulent mixing layer

Antonio Attili, Fabrizio Bisetti

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

A highly resolved Direct Numerical Simulation of a spatially developing turbulent mixing layer is presented. In the fully developed region, the flow achieves a turbulent Reynolds number Reλ = 250, high enough for a clear separation between large and dissipative scales, so for the presence of an inertial range. Structure functions have been calculated in the self-similar region using velocity time series and Taylor's frozen turbulence hypothesis. The Extended Self-Similarity (ESS) concept has been employed to evaluate relative scaling exponents. A wide range of scales with scaling exponents and intermittency levels equal to homogeneous isotropic turbulence has been identified. Moreover an additional scaling range exists for larger scales; it is characterized by smaller exponents, similar to the values reported in the literature for flows with strong shear.
Original languageEnglish (US)
Title of host publicationJournal of Physics: Conference Series
PublisherIOP Publishing
Pages042001
DOIs
StatePublished - Dec 22 2011

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