Title: Large Eddy Simulation of a turbulent swirling coaxial jet

Authors: K.K.J. Ranga Dinesh, A.M. Savill, K.W. Jenkins, M.P. Kirkpatrick

Addresses: School of Engineering, Cranfield University, Cranfield, Bedford, MK43 0AL, UK. ' School of Engineering, Cranfield University, Cranfield, Bedford, MK43 0AL, UK. ' School of Engineering, Cranfield University, Cranfield, Bedford, MK43 0AL, UK. ' School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia

Abstract: This work uses the Large Eddy Simulation (LES) technique to study velocity and passive scalar mixing along with intermittency of a spatially evolving turbulent coaxial swirl jet. The simulations captured the potential core and also predicted high level turbulence intensities in the inner mixing regions. The Probability Density Functions (PDFs) and radial intermittency plots revealed an intermittent mixing behaviour especially in the outer region of the flow where the fluctuations of velocity rapidly change from rotational to irrotational and vice versa. The PDF and radial intermittency profiles exhibit Gaussian and non-Gaussian distributions close to the jet centreline and away from the centreline, respectively.

Keywords: turbulent swirling coaxial jets; passive scalar mixing; LES; large eddy simulation; probability density functions; radial intermittency plots.

DOI: 10.1504/PCFD.2010.031561

Progress in Computational Fluid Dynamics, An International Journal, 2010 Vol.10 No.2, pp.88 - 99

Published online: 10 Feb 2010 *

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