Understanding how turbulence leads to the enhanced irreversible transport of heat and
other scalars such as salt and pollutants in density-stratified fluids is a fundamental and …

Rossby waves are a pervasive feature of the large-scale motions of the Earth's atmosphere
and oceans. These waves (also known as planetary waves and r-modes) also play an …

Motivated by the importance of stratified shear flows in geophysical and environmental
circumstances, we characterize their energetics, mixing and spectral behaviour through a …

We relate the model of vorticity wave interaction to Krein collision, PT-symmetry breaking,
and the formation of exceptional points in shear flow instabilities. We show that the …

Velocity pulsing has previously been observed in continuous turbidity currents in lakes and
reservoirs, even though the input flow is steady. Several different mechanisms have been …

The velocity perturbations and Reynolds stresses associated with finite-amplitude Holmboe
instabilities are investigated using linear stability analysis, numerical simulations, and …

The interacting vorticity wave formalism for shear flow instabilities is extended here to the
magnetohydrodynamic (MHD) setting, to provide a mechanistic description for stabilising …

We show that the radial electric field (E r) plays a dual role in edge magnetohydrodynamics
(MHD) activity. While E r shear (first spatial derivative of E r) dephases radial velocity and …

We study magnetorotational instability (MRI) using nonmodal stability techniques. Despite
the spectral instability of many forms of MRI, this proves to be a natural method of analysis …

Initial perturbations are commonly used in direct numerical simulations (DNS) to trigger the
shear instability of stratified fluids. We investigate the effects of initial perturbations on the …