Structure function scaling in a Reλ = 250 turbulent mixing layer

A. Attili and F. Bisetti
J. Phys.: Conf.  Ser., 318, 042001, (2011)

Structure function scaling in a Reλ  = 250 turbulent mixing layer

Keywords

Turbulent mixing layer

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.

Code

DOI: 10.1088/1742-6596/318/4/042001

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