DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf
ISBN Print: 978-1-56700-262-1
ISSN: 2377-2816
Kinetic energy budgets at the edge of a turbulent jet
ABSTRAKT
Direct numerical simulations (DNS) of turbulent plane jets are used to assess the kinetic energy dynamics near the turbulent/nonturbulent interface in a jet. The thickness of the vorticity jump at the T/NT interface is equal to the Taylor micro-scale and the irrotational velocity fluctuations near the interface give rise to important Reynolds stresses at the irrotational flow region. Conditional kinetic energy budgets show that most of the terms governing the kinetic energy are concentrated in a region of distancing roughly 3 Taylor-micro scales from the T/NT interface. The effect of the intense large scale vorticity structures in shaping the energy dynamics near the jet edge is assessed.