Conference Proceedings

The influence of the turbulent/non-turbulent interface geometry on local entrainment

D Mistry, JR Dawson, J Philip, I Marusic

10th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2017 | Published : 2017

Abstract

In this paper we examine the local entrainment velocity (vn) along the turbulent/non-turbulent interface (TNTI) to determine how vn is influenced by the local geometry of the TNTI. Time-resolved, simultaneous particle image velocimetry (PIV) and planar laser-induced fluorescence (PLIF) measurements were taken in the far-field of an axisymmetric jet at Re = 25300. We use isocontours of scalar concentration (Sc≫1) to identify the TNTI and implement an interface-tracking technique to determine the local entrainment velocity along the TNTI. The TNTI geometry is characterised using (i) the interface radial position, (ii) the local interface curvature and (iii) the orientation of the TNTI surface...

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