Second-order closure in stratified turbulence: Simulations and modeling of bulk and entrainment regions

L. Biferale, F. Mantovani, M. Sbragaglia, Andrea Scagliarini, F. Toschi, R. Tripiccione

Research output: Contribution to journalArticleAcademicpeer-review

35 Citations (Scopus)
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Abstract

The parametrization of small-scale turbulent fluctuations in convective systems and in the presence of strong stratification is a key issue for many applied problems in oceanography, atmospheric science, and planetology. In the presence of stratification, one needs to cope with bulk turbulent fluctuations and with inversion regions, where temperature, density, or both develop highly nonlinear mean profiles due to the interactions between the turbulent boundary layer and the unmixed—stable—flow above or below it. We present a second-order closure able to cope simultaneously with both bulk and boundary layer regions, and we test it against high-resolution state-of-the-art two-dimensional numerical simulations in a convective and stratified belt for values of the Rayleigh number up to Ra~1010. Data are taken from a Rayleigh-Taylor system confined by the existence of an adiabatic gradient.
Original languageEnglish
Article number016305
Pages (from-to)016305-1/7
Number of pages7
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume84
Issue number1
DOIs
Publication statusPublished - 2011

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