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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41367

Authors: Amalendu Sau;Robert R. Hwang
Contributors: 國立臺灣海洋大學:機械與機電工學系
Keywords: streamwise dynamics;inflow and outflow vortices;axis switching;mass entrainment
Date: 2011
Issue Date: 2017-02-14T08:49:37Z
Publisher: Journal of Marine Science and Technology
Abstract: ABSTRACT:Within the framework of the present investigation we perform
Direct Numerical Simulations to study the role of streamwise
dynamics in the jet spreading and mixing, and provide a
clear understanding about the source of these important vortices
in two-step rectangular sudden expansion flows. The
present setup is designed to generate higher mass entrainment,
and the system generated passive forcing provided the necessary
impetus for the sustained growth/evolution of the
streamwise vertices, which played the key role in the mixing
enhancement. On the other hand, by suitably placing two tiny
rectangular ‘tabs’ on the inlet channel walls, the nature of
growth and the dynamics of the streamwise extended threedimensional
vortical rollers could be effectively controlled.
These vortices through their inflow/outflow type dynamics are
found to effectively control the downstream jet spreading; and
the associated physical processes either lead to quick axis
switching of the jet section, or stop axis switching altogether.
In addition, an extensive pressure analysis, as presented here,
suggests that the transverse pressure gradient skewing is
probably the major source of streamwise vorticity generation
for the flow
Relation: 19(6),pp.607-613
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41367
Appears in Collections:[系統工程暨造船學系] 期刊論文

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