@article{a0cc15ce7bc24f88a32cd05b50e5661a,
title = "Stratified shear flow instabilities in the non-Boussinesq regime",
abstract = "Effects of the baroclinic torque on wave propagation normally neglected under the Boussinesq approximation is investigated here, with a special focus on the associated consequences for the mechanistic interpretation of shear instability arising from the interaction between a pair of vorticity-propagating waves. To illustrate and elucidate the physical effects that modify wave propagation, we consider three examples of increasing complexity: wave propagation supported by a uniform background flow; wave propagation supported on a piecewise-linear basic state possessing one jump; and an instability problem of a piecewise-linear basic state possessing two jumps, which supports the possibility of shear instability. We find that the non-Boussinesq effects introduce a preference for the direction of wave propagation that depends on the sign of the shear in the region where waves are supported. This in turn affects phase-locking of waves that is crucial for the mechanistic interpretation for shear instability, and is seen here to have an inherent tendency for stabilisation.",
author = "E. Heifetz and J. Mak",
note = "Publisher Copyright: {\textcopyright} 2015 AIP Publishing LLC.",
year = "2015",
month = aug,
doi = "10.1063/1.4928738",
language = "אנגלית",
volume = "27",
journal = "Physics of Fluids",
issn = "1070-6631",
publisher = "American Institute of Physics",
number = "8",
}