2023
DOI: 10.31223/x5009t
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The effects of boundary proximity on Kelvin-Helmholtz instability and turbulence

Abstract: Studies of Kelvin-Helmholtz (KH) instability have typically modelled the initial flow as an isolated shear layer.In geophysical cases, however, the instability often occurs near boundaries and may therefore be influenced by boundary proximity effects. Ensembles of direct numerical simulations are conducted to understand the effect of boundary proximity on the evolution of the instability and the resulting turbulence. Ensemble averages are used to reduce sensitivity to small variations in initial conditions. Bo… Show more

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(2 citation statements)
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“…Although such a convective arrangement may arise ephemerally within individual shear instability events (i.e. during shear-driven turbulence) 38,39,58 , here we use the term 'convective turbulence' more restrictively, to effectively implies the neglect of the potential role of nonlinear internal wave deformation and breaking in triggering convective mixing 34 .…”
Section: Assessment Of the Relative Roles Of Convective And Shear-dri...mentioning
confidence: 99%
See 1 more Smart Citation
“…Although such a convective arrangement may arise ephemerally within individual shear instability events (i.e. during shear-driven turbulence) 38,39,58 , here we use the term 'convective turbulence' more restrictively, to effectively implies the neglect of the potential role of nonlinear internal wave deformation and breaking in triggering convective mixing 34 .…”
Section: Assessment Of the Relative Roles Of Convective And Shear-dri...mentioning
confidence: 99%
“…Our canyon's length (~30 km), width (~8 km at its mouth), vertical extent (>1000 m from mouth to head), aspect ratio (~80º, denoting a relatively narrow canyon), V-shaped geometry (with axial slope near M2 tidal criticality, and steep, supercritical sidewalls), and characteristic barotropic tidal speeds (~0.08 m s -1 )all factors likely to shape the governing physics and intensity of the in-canyon mixing 30,31 are in line with those of many continental-slope canyons in the global ocean 20,21,30 . Second, observational and modelling investigations of nearboundary mixing in a range of oceanic 26,[33][34][35] , limnic 36,37 and idealized geophysical fluid 38,39 settings indicate that the convective process documented here may be of broad generality to oscillatory flows over sloping topography, regardless of the details of the flow or topographic configuration. We can thus surmise that the mechanism of rapid, convectively-induced along-boundary upwelling highlighted by our work is likely to operate elsewhere.…”
mentioning
confidence: 96%