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Temperature front formation in stably stratified turbulence

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ADI - Anti-diffusive dynamics: from sub-cellular to astrophysical scales

Through interactions between the modes of “waves” and “vortices”, stably stratified turbulence exhibits characteristic features both in 2D and 3D. Using DNS of the Navier-Stokes equations under the Boussinesq approximation, we investigate dynamical properties of stably stratified turbulence in relation with the mixed dimensionality. Also it is demonstrated that the temperature fluctuations make sharp fronts vertically which show sawtooth wave structures. Such sawtooth or cliff-ramp structures result in non-symmetric PDFs of the vertical derivative of temperature fluctuations. The reason for the mechanism of asymmetry will be considered.   

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