Secondary Instability of Round Jets by the Global Instability Analysis.

Exploratory Data Analysis of The KelvinHelmholtz instability in Jets

The KelvinHelmholtz (KH) instability is a fundamental wave instability that is frequently observed in all kinds of shear layer (jets, wakes, atmospheric air currents etc). The study of KH-instability, coherent flow structures has a major impact in understanding the fundamentals of fluid dynamics. Therefore there is a need for methods that can identify and analyse these structures. In this Final...

Kelvin-Helmholtz instability of stratified jets

In this paper we continue investigations of the Kelvin-Helmholtz instability of stratified jets. We first generalize our previous analytical results by taking into consideration relativistic motion and relativistic equation of states for the three components namely the inner beam, the sheet or envelope and the ambient medium, and derive the dispersion relation for the Kelvin-Helmholtz instabili...

Hydrodynamical Instability of Extragalactic Stratified Jets

Secondary instability of salt sheets

In the presence of a vertically varying horizontal current (background shear), the salt-fingering instability is supplanted by the salt-sheet instability. Previous direct numerical simulation (DNS) experiments on salt sheets revealed that flow becomes turbulent via secondary instabilities. We call these instabilities zig-zag and tip modes. Here, we investigate the physics of these modes using l...

Secondary instability of crossflow vortices

Crossflow-dominated swept-wing boundary layers are known to undergo a highly nonlinear transition process. In low-disturbance environments, the primary instability of these flows consists mainly of stationary streamwise vortices that modify the mean velocity field and hence the stability characteristics of the boundary layer. The result is amplitude saturation of the dominant stationary mode an...