Contrasting turbulence in stably stratified flows and thermal convection

Verma, Mahendra K (2019) Contrasting turbulence in stably stratified flows and thermal convection Physica Scripta, 94 (6). 064003. ISSN 0031-8949

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Official URL: http://doi.org/10.1088/1402-4896/ab022a

Related URL: http://dx.doi.org/10.1088/1402-4896/ab022a

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, ${{ \mathcal F }}_{B}$. For SST, ${{ \mathcal F }}_{B}\lt 0$ 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 ${{ \mathcal F }}_{B}\gt 0$ 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.

Item Type:Article
Source:Copyright of this article belongs to Royal Swedish Academy of Sciences.
ID Code:118911
Deposited On:04 Jun 2021 07:45
Last Modified:04 Jun 2021 07:45

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