Nonlocal turbulent transport in a buoyant vortex ring during the ascent of a thermal in a stratified atmosphere

A. V. Konyukhov, M. V. Meshcheryakov, S. V. Utyuzhnikov, L. A. Chudov

Research output: Contribution to journalArticlepeer-review

Abstract

The flow initiated by a hot gas cloud (thermal) in a stratified atmosphere is calculated on the basis of the k-ε turbulence model and the transport model for the Reynolds stresses and turbulent fluxes and the results obtained are compared. The nonlocal nature of the turbulent transport in a vortex ring and its effect on certain flow characteristics are explained. In particular, the calculations carried out using the Reynolds stress model show much slower cooling of the temperature-vortex torus than those based calculated on the k-ε-model Modification of the k-ε-model to take the effect of curvature of the streamlines approximately into account makes it only partially possible to reproduce the results obtained on the basis of the Reynolds stress model.

Original languageEnglish
Pages (from-to)9-16
Number of pages8
JournalFluid Dynamics
Volume34
Issue number1
DOIs
Publication statusPublished - 1999
Externally publishedYes

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