Direct numerical simulations of the turbulent annular jet with different diameter ratio

We performed direct numerical simulations (DNS) of the turbulent annular jet flow for the Reynolds number Re = 8900 with three different values of the inner-to-outer diameter ratio (a = d / D = 0.3, 0.5, 0.7). The time-averaged velocity fields and fluctuations were analyzed. The low aspect ratio res...

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Bibliographic Details
Published in:Journal of physics. Conference series 2018-11, Vol.1105 (1), p.12007
Main Authors: Ryzhenkov, V, Mullyadzhanov, R
Format: Article
Language:English
Subjects:
Computational fluid dynamics
Direct numerical simulation
Fluid flow
Jet flow
Kinetic energy
Low aspect ratio
Reynolds number
Stagnation point
Turbulent flow
Velocity distribution
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Summary:We performed direct numerical simulations (DNS) of the turbulent annular jet flow for the Reynolds number Re = 8900 with three different values of the inner-to-outer diameter ratio (a = d / D = 0.3, 0.5, 0.7). The time-averaged velocity fields and fluctuations were analyzed. The low aspect ratio results in the shortest recirculation zone while for high a value the stagnation point features high level of turbulent kinetic energy. This is the evidence of the accompanying low-frequency oscillations of the recirculation zone.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1105/1/012007