Three dimensionalization of the stratified mixing layer
1994; American Institute of Physics; Volume: 6; Issue: 12 Linguagem: Inglês
10.1063/1.868370
ISSN1527-2435
AutoresC. P. Caulfield, W. R. Peltier,
Tópico(s)Meteorological Phenomena and Simulations
ResumoA theoretical analysis of the stability of a stratified, two-dimensional Kelvin–Helmholtz billow against three-dimensional perturbations is presented. This predicts the three-dimensional spectrum to be dominated by a shear aligned convective instability, which is localized in the region surrounding the billow core. The results of a direct numerical simulation of the evolution of the three-dimensional stratified mixing layer fully verify the dominance of this convective mode in the mixing transition. The origin of the streamwise streaks of vorticity, which precede turbulent collapse in a stratified shear layer, is thereby explained.
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