Inam, M.I., Lin, W., Armfield, S.W., and He, Y. (2014) Penetration height and onset of asymmetric behaviour of transitional plane fountains in linearly stratified fluids. In: Proceedings of the 19th Australasian Fluid Mechanics Conference. 427. From: AFMC 2014: 19th Australasian Fluid Mechanics Conference, 8-11 December 2014, Melbourne, VIC, Australia.

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Abstract

The onset of asymmetry, three-dimensionality and entrainment, which occurs in transitional fountains with intermediate Froude and Reynolds numbers (1 < Fr < 10, 10 < Re < 1000) is the key to shed light on the turbulence generation mechanism in fountains. The stratification of the ambient fluid also has significant effects on these characteristics of fountain flows. In this study a series of direct numerical simulation (DNS) are carried out with varied stratifications (quantified by a dimensionless stratification parameter s over 0 ≤ s ≤ 1.5) and different Re over 25 ≤ Re ≤ 300, but all at Fr = 5, to examine the penetration height and the onset of asymmetry in transitional plane fountains. The results show that fountain heights decrease when s increases, but increase when Re increases. When Re is small, a fountain generally starts to show the asymmetric behaviour at a much later time and the extent of asymmetry increases when Re increases, although the rate of increase decreases with Re. On the other hand, the stratification of the ambient fluid is found to play a positive role to stabilize the flow and to alleviate its asymmetric and unsteady behavior.

Item ID:	37282
Item Type:	Conference Item (Research - E1)
ISBN:	978-0-646-59695-2
Related URLs:	Organisation Publisher
Funders:	Australian Research Council (ARC), National Natural Science Foundation of China, Yunnan Natural Science Foundation, China, James Cook University (JCU)
Projects and Grants:	National Natural Science Foundation of China (51469035, 11072211), Yunnan Natural Science Foundation (2011FA017)
Date Deposited:	17 Feb 2015 00:19
FoR Codes:	09 ENGINEERING > 0915 Interdisciplinary Engineering > 091504 Fluidisation and Fluid Mechanics @ 100%
SEO Codes:	97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 100%
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