Diapycnal mixing of passive tracers by Kelvin–Helmholtz instabilities

J Penney, Y Morel, P Haynes, F Auclair… - Journal of Fluid …, 2020 - cambridge.org
This paper considers the diapycnal transport of passive tracers during a Kelvin–Helmholtz
mixing event. Numerical simulations of a traditional Kelvin–Helmholtz (KH) configuration of a …

On Bragg resonances and wave triad interactions in two-layered shear flows

R Raj, A Guha - Journal of Fluid Mechanics, 2019 - cambridge.org
The standard resonance conditions for Bragg scattering as well as weakly nonlinear wave
triads have been traditionally derived in the absence of any background velocity. In this …

On the inertial effects of density variation in stratified shear flows

A Guha, R Raj - Physics of Fluids, 2018 - pubs.aip.org
In this paper, we first revisit the celebrated Boussinesq approximation in stratified flows.
Using scaling arguments we show that when the background shear is weak, the Boussinesq …

On physical optics approximation of stratified shear flows with eddy viscosity

N Karjanto - Physics of Fluids, 2021 - pubs.aip.org
We study a mathematical model of a perturbed stratified shear mean flow in the presence of
eddy coefficients of turbulent viscosity. We adopt the standard Boussinesq approximation in …

Holmboe instability beyond the Boussinesq approximation revisited

SM Churilov - Physics of Fluids, 2019 - pubs.aip.org
With no use of the Boussinesq approximation, the Holmboe instability is studied in sharply
stratified shear flows with arbitrary monotonic and bounded velocity profiles without …