Direct numerical simulation of confined weak round fountains in homogeneous ambient

Dong, Liqiang, Lin, Wenxian, and Khatamifar, Mehdi (2021) Direct numerical simulation of confined weak round fountains in homogeneous ambient. Case Studies in Thermal Engineering, 28. 101528.

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Abstract

Fountains (negatively buoyant jets) are commonly used in numerous engineering applications, such as the natural ventilation in buildings and the smoke spread in compartment fires. In this study, the long-term behavior of weak round fountains in homogeneous ambient confined in a cylindrical container was analyzed using three-dimensional direct numerical simulation over a range of the Froude number (Fr), Reynolds number (Re), dimensionless radius of the container (λ), respectively. The confined weak round fountain behaves in the manner of a ‘fountain filling box’ flow, experiencing five development stages, i.e., the formation of the fountain flow, the intrusion flow, the wall fountain, the reversed flow and the stratification. Three stages of the development of the bulk entrainment rate are identified and the dominant mechanisms involved are analyzed. Fr = 1 and 2 are identified as the approximate critical values to distinguish the behavior of the intrusion, wall fountain and stratification. Re = 200 is determined as the approximate critical value to distinguish the influence of Re. These are consistent with the existing results about the round fountains.

Item ID: 69928
Item Type: Article (Research - C1)
ISSN: 2214-157X
Keywords: Direct numerical simulation, Filling box, Fountain, Stratification, Wall fountain
Copyright Information: © 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license
Funders: Australian Research Council (ARC), James Cook University (JCU)
Date Deposited: 29 Nov 2021 01:54
FoR Codes: 40 ENGINEERING > 4012 Fluid mechanics and thermal engineering > 401208 Geophysical and environmental fluid flows @ 100%
SEO Codes: 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280110 Expanding knowledge in engineering @ 100%
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