Abstract
The properties of stably stratified turbulence and turbulent thermal convection are contrasted in this paper. A key difference between theses flows is the sign of the kinetic energy feed by buoyancy, . For SST, due to its stable nature; consequently, the kinetic energy flux Πu(k) decreases with wavenumber k that leads to a steep kinetic energy spectrum, Eu(k) ∼ k−11/5. Turbulent convection is unstable, hence that leads to an increase of Πu(k) with k; this increase however, is marginal due to relatively weak buoyancy, hence Eu(k) ∼ k−5/3, similar to that in hydrodynamic turbulence. This paper also describes the conserved fluxes for the above systems.
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