Citation:
Ranga-Dinesh KKJ, Jenkins KW, Savill AM, Kirkpatrick MP. (2010) Influence of bluff-body and swirl on mixing and intermittency of jets. Engineering Applications of Computational Fluid Mechanics, Volume 4, Issue 3, pp. 374-386
Abstract:
In this paper we present the modelled results of turbulence, scalar mixing and
intermittency for three different basic fluid dynamical problems using large
eddy simulation (LES). The modelled problems are a turbulent round jet, a bluff
body stabilised jet, and a bluff body stabilised swirl jet in a co-flow
environment. Both instantaneous and time averaged results along with the
probability density functions (pdf) and intermittency of velocity and passive
scalar are presented. Simulations well captured the flow features of jet, bluff
body stabilised jet and bluff body stabilised swirl jet. The instantaneous and
time averaged data show the differences in turbulence and mixing and also an
improvement of mixing in the presence of a bluff body and swirl. The addition of
bluff body and swirl affect the structure of pdfs for both velocity and passive
scalar at different axial and radial locations. The radial variation of
intermittency at locations close to the centreline indicates turbulent to non-
turbulent phenomena respect to bluff body and swirl at both upstream and
downstream recirculation regions.