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.
