Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/933014

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Title
Key factors in determining the magnitude of vorticity in turbulent plane wakes
Author/Creator
Mi, Jian-Chun;  Antonia, R. A.
Institution
The University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering
Description
We examine the effects of local turbulence Reynolds number R⋋ and inflow conditions on the magnitude of vorticity in plane turbulent wakes. Measurements of the spanwise component (ω₃) of the fluctuating vorticity vector ω = ω₁i + ω₂j + ω₃k (here the subscripts 1, 2 and 3 denote the streamwise, lateral and spanwise directions, respectively) are made in turbulent wakes of a screen and a circular cylinder. Lateral distributions of ω*₃ (normalized) in general depend on both R⋋ and inflow conditions. In the developing region, as the downstream distance x₁ increases, ω*₃ increases significantly in the screen wake but decreases slightly in the cylinder wake. Far downstream in the self-preserving region, ω*₃ increases linearly with R⋋ while it no longer varies with x₁ and depends weakly on the influence of inflow conditions. Our analysis suggests that these findings from the measurement of ω*₃ should apply for the magnitude of ω.
Relation
Chinese Physics Letters Vol. 27, Issue 2
Publisher Link
http://dx.doi.org/10.1088/0256-307x/27/2/024702
Date
2010
Publisher
Institute of Physics Publishing
Keyword(s)
cylinder wake;  fluctuations;  calibration;  probes;  flow
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/933014
Identifier
ISSN:0256-307X
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Subject
"Chinese Physics Letters"
 
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