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Identification and characterization of three-dimensional turbulent flow structures

Farideh Ghasempour (Institutionen för kemi och kemiteknik, Kemisk reaktionsteknik) ; Ronnie Andersson (Institutionen för kemi och kemiteknik, Kemisk reaktionsteknik) ; Bengt Andersson (Institutionen för kemi och kemiteknik, Kemisk reaktionsteknik)
AIChE Journal (0001-1541). Vol. 62 (2016), 4, p. 1265-1277.
[Artikel, refereegranskad vetenskaplig]

Many phenomena in chemical processes for example fast mixing, coalescence and break-up of bubbles and drops are not correctly described using average turbulence properties as the outcome is governed by the interaction with individual vortices. In this study, an efficient vortex-tracking algorithm has been developed to identify thousands of vortices and quantify properties of the individual vortices. The traditional algorithms identifying vortex-cores only capture a fraction of the total turbulent kinetic energy, which is often not sufficient for modeling of coalescence and break-up phenomena. In the present algorithm, turbulent vortex-cores are identified using normalized Q-criterion, and allowed to grow using morphological methods. The growth is constrained by estimating the influence from all neighboring vortices using the Biot-Sawart law. This new algorithm allows 82% of the total turbulent kinetic to be captured, at the same time the individual vortices can be tracked in time. (c) 2015 American Institute of Chemical Engineers AIChE J, 62: 1265-1277, 2016

Nyckelord: vortex structure, vortex-tracking algorithm, turbulent kinetic energy, Q-criterion, LES



Denna post skapades 2016-04-29. Senast ändrad 2016-07-01.
CPL Pubid: 235632

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Kemisk reaktionsteknik

Ämnesområden

Kemi

Chalmers infrastruktur