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Article Dans Une Revue Journal of Fluid Mechanics Année : 2018

Erosion of a sharp density interface by a turbulent jet at moderate Froude and Reynolds numbers

Résumé

Using water-salt water laboratory experiments, we investigate the mechanism of erosion by a turbulent jet impinging onto a density interface, for moderate Reynolds and Froude numbers. The Froude number is defined by Fr-i = u(i)/root big', with ui and b(i), the typical velocity and width of the jet at the interface, and g' the reduced gravitational acceleration. The Froude number Fr-i characterizes the competition between inertial forces against the restoring buoyancy force. Contrary to previous observations reporting baroclinic destabilization of the interface, we show that the entrainment, in the range of parameters explored here, is driven by interfacial gravity waves. The waves are generated by the barotropic excitation coming from the turbulent fluctuations of the jet; they are then amplified by a mechanism of wave-induced stress; and they finally break and induce entrainment and mixing. Based on those physical observations, we introduce a scaling model for the entrainment rate, which varies continuously from Fr-i(3) to an Fr-i power law from small to large Froude numbers, in agreement with the present and some of the previous laboratory data.
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Dates et versions

hal-01760540 , version 1 (06-04-2018)

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J. Herault, G. Facchini, M. Le Bars. Erosion of a sharp density interface by a turbulent jet at moderate Froude and Reynolds numbers. Journal of Fluid Mechanics, 2018, 838, pp.631-657. ⟨10.1017/jfm.2017.891⟩. ⟨hal-01760540⟩
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