Density Peaking by Parallel Flow Shear Driven Instability

Generation of ripples by shear - flow instability

We consider the linear stability of a monotonically decreasing, concave shear flow beneath a free surface with gravity and capillarity. An archetypical example, with current U = U0 exp(z/h), is solved analytically and studied in detail. Comparison with several other smooth velocity profiles indicates that the exponential profile is representative of all smooth monotonic concave velocity profile...

Density - shear instability in electron MHD

Generation of surface waves by shear-flow instability

We consider the linear stability of an inviscid parallel shear flow of air over water with gravity and capillarity. The velocity profile in the air is monotonically increasing upwards from the sea surface and is convex, while the velocity in the water is monotonically decreasing from the surface and is concave. An archetypical example, the ‘double-exponential’ profile, is solved analytically an...

Interface instability in shear-banding flow.

We report on the spatiotemporal dynamics of the interface in shear-banding flow of a wormlike micellar system (cetyltrimethylammonium bromide and sodium nitrate in water) during a start-up experiment. Using the scattering properties of the induced structures, we demonstrate the existence of an instability of the interface between bands along the vorticity direction. Different regimes of spatiot...

Radiation Instability in a Stratified Shear Flow

The paper deals with a new mechanism of instability in stratified fluid caused by internal wave radiation from a shear layer. This radiation instability may be explained in terms of the negativeenergy wave concept. These waves are able to grow due to radiation losses. The dispersion relation and non-linear stage of the process are analyzed through a model with tangential velocity discontinuity....