Rectangular jet with shear layer swirl: Rotation & mixing enhancement

Steady Axisymmetric Vortex Flows with Swirl and Shear

A general procedure is presented for computing axisymmetric swirling vortices which are steady with respect to an inviscid flow that is either uniform at infinity or includes shear. We consider cases both with and without a spherical obstacle. Choices of numerical parameters are given which yield vortex rings with swirl, attached vortices with swirl analogous to spherical vortices found by Moff...

Numerical Simulation of Mixing Enhancement in a Hot Supersonic Jet

Experimental observations show that the presence of small tabs on the edge of a hot, compressible jet exiting into a slower moving, colder ambient ow can increase the rate of spreading of the jet. This suggests that the rate of mixing of the jet and the ambient uid is also increased. In order to elucidate the physical mechanism responsible for the increased spreading rate a set of calculations ...

Turbulent mixing in a marginally-unstable shear layer

Large-eddy simulation (LES) is used to investigate turbulence in a marginally-unstable stratified shear layer motivated by the observation of deep-cycle turbulence in the upper Equatorial Undercurrents. The initial condition consists of uniform shear and stratification profiles, and a constant gradient Richardson number Rig = 0.25. A constant wind stress forces turbulence in the upper surface l...

Stellar evolution with rotation II. A new approach for shear mixing

Recent observations show Heand N-enhancements in fast rotating O-type stars, while studies on shear mixing in rotating stars have shown that the μ-gradients generally inhibit mixing processes. However, these studies (including ours) ignored the other sources of turbulence, such as semiconvection and horizontal turbulence, which may be present in the medium and may modify the onset of shear mixi...

The statistical evolution of a stratified mixing layer with horizontal shear invoking feature extraction