Front propagation in Rayleigh-Taylor systems with reaction

Andrea Scagliarini, L. Biferale, F. Mantovani, M. Pivanti, F. Pozzati, M. Sbragaglia, S.F. Schifano, F. Toschi, R. Tripicionne

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

3 Citations (Scopus)
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Abstract

A special feature of Rayleigh-Taylor systems with chemical reactions is the competition between turbulent mixing and the "burning processes", which leads to a highly non-trivial dynamics. We studied the problem performing high resolution numerical simulations of a 2d system, using a thermal lattice Boltzmann (LB) model. We spanned the various regimes emerging at changing the relative chemical/turbulent time scales, from slow to fast reaction; in the former case we found numerical evidence of an enhancement of the front propagation speed (with respect to the laminar case), providing a phenomenological argument to explain the observed behaviour. When the reaction is very fast, instead, the formation of sharp fronts separating patches of pure phases, leads to an increase of intermittency in the small scale statistics of the temperature field.
Original languageEnglish
Title of host publication13th European Turbulence Conference (ETC13)
Pages092024-1/10
DOIs
Publication statusPublished - 2011

Publication series

NameJournal of Physics: Conference Series
Volume318
ISSN (Print)1742-6588

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