Concurrent Scale Interactions in the Far-Field of a Turbulent Mixing Layer

Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 165)

Abstract

The interaction between large- and small-scale fluctuations in turbulent flow is not only of great fundamental interest but an understanding of these interactions is fundamental to the modelling of the sub-grid scale (SGS) stresses in a large eddy simulation (LES). Particle image velocimetry (PIV) data is acquired with two different spatial resolutions, simultaneously, in the self-similar region of a turbulent planar mixing layer. The SGS activity is observed to be amplified by concurrent large-scale low momentum fluctuations and attenuated by high momentum fluctuations with both the sign and magnitude of the large-scale fluctuations being of significance. Further, regions in which the orientation of the large-scale Reynolds stress tensor is aligned perpendicularly to the direction of the mean shear of the flow are shown to lead to an increased level of small-scale activity.

Keywords

Particle Image Velocimetry Taylor Microscale Open Area Ratio Free Shear Flow High Speed Side 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.Department of AeronauticsImperial College LondonLondonUK
  2. 2.Aerodynamics and Flight Mechanics Research GroupUniversity of SouthamptonSouthamptonUK

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