Direct simulation of transitional plane fountains in a homogeneous fluid

Lin, Wenxian, Armfield, S.W., and Patterson, J.C. (2007) Direct simulation of transitional plane fountains in a homogeneous fluid. ANZIAM Journal, 48. pp. 692-708.

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Abstract

The fluid dynamics of transitional plane fountains with the Froude and Reynolds numbers in the ranges 1≤Fr≤6 and 100≤Re≤800 is investigated to examine the entrainment associated with the onset of turbulence. The direct numerical simulation results show that negligible entrainment occurs at the upflow-downflow interface for small Fr (<2) fountains, and only small entrainment on the downflow-ambient interface. However, entrainment occurs at both the upflow-downflow and the downflow-ambient interfaces for large Fr (>2) fountains, even at Re=100, with the extent of the entrainment increasing almost linearly with Re. The upflow and fountain widths show strong Re dependence and increase linearly with Fr, demonstrating that the onset of entrainment and instability occurs at relatively high Re (>1000) in small Fr (≤2) fountains, but at small Re (<100) in large Fr (>2) fountains.

Item ID: 2259
Item Type: Article (Refereed Research - C1)
Keywords: fountain flow; direct numerical simulation; turbulent flow; instability; transitional flow; entrainment
ISSN: 1446-8735
Date Deposited: 29 May 2009 04:59
FoR Codes: 09 ENGINEERING > 0915 Interdisciplinary Engineering > 091504 Fluidisation and Fluid Mechanics @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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