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- W2044896643 abstract "Abstract We investigate the development of two-dimensional turbulence in a temporally-growing shear layer. This is accomplished through the application of numerical simulation techniques in computational domains which accommodate many wavelengths of the primary Kelvin-Helmholtz instability. Both homogeneous and density-stratified flows are considered. Spreading rates of homogeneous and stratified shear layers are computed and compared with the results of laboratory experiments. We show that shear-driven vortex mergers generate downscale enstrophy cascades through filamentation, as do the mergers which occur in the isotropic case. In the long-time limit, homogeneous shear layers are dominated by a single coherent vortex. The addition of even a slight degree of stratification alters the vortex dynamics dramatically. Vortex filaments which are generated and stabilized by the straining deformations between adjacent large vortices are reinforced by the baroclinic torque. As a result, these structures ultimately dominate the vorticity field in weakly-stratified flows. In strongly-stratified cases, pairing instability is suppressed and the flow relaxes quickly to a stable parallel state." @default.
- W2044896643 created "2016-06-24" @default.
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- W2044896643 date "1993-06-01" @default.
- W2044896643 modified "2023-09-27" @default.
- W2044896643 title "Two-dimensional turbulence in homogeneous and stratified shear layers" @default.
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- W2044896643 doi "https://doi.org/10.1080/03091929308203572" @default.
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