NDLI: Particulars of the cross- and spanwise near-wake development of a short Semicircular-section Shell, through the TransitionRe-range (60 ≤Re ≤ 600)

Content Provider	Springer Nature Link
Author	Coutanceau, M. Migeon, C. Ehrmann, P.
Copyright Year	2000
Abstract	Within the fundamental context of quasi-2D bluff-body near-wake investigation, we analyse the way the initial wake vortices (primary and secondary vortices) form and develop with time behind a short (5.2∶1) cylindrical semicircular shell (hollow at the back), after an impulsive start in translation. The study includes the transition regime and non-usual cross-sectional shapes. The structure of the vortices is examined by means of precise visualizations both in the mid-cross and mid-span planes. The particulars induced by the hollow face are deduced from a comparison with the cases of analogous solid cylinders and more particularly with the full semicircular cylinder (Boisaubert et al., 1996; Coutanceau et al., 1998).The crosswise analysis shows that, except some fundamental difference at the separation initiation and some differences in details, a similar development of the Bénard-Kàrmàn-vortices is observed, thus :- the regime of the occurring structures changes beyond the first phase of development (i.e.t * ≥ 6) when Reynolds number is passing through a critical valueRe c (here 120 ≤Re c ≤ 140)- Kelvin-Helmholtz instabilities are detected forRe = 600 in the rolled-up separated shear layers originating from the sharp body-edges. On the contrary, the spanwise analysis reveals that the hollow face plays an important role in the time-development of the induced body-end three-dimensionalities (end-vortices and opposite spanwise currents) and intrinsic three-dimensionalities respectively. Thus, as opposed to solid bodies similarly limited in span, the emergence of clear patterns of secondary Taylor-Görtler-like vortices in the near wake have been experimentally proved for the first time whenRe passes beyond the transition value ofRe $_{t}$ ≊ 200. The consequence on the global structure of the flow is deduced.
Starting Page	9
Ending Page	26
Page Count	18
File Format	PDF
ISSN	13438875
Journal	Journal of Visualization
Volume Number	3
Issue Number	1
e-ISSN	18758975
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	three-dimensional formation cylindrical shell cross and spanwise visualization secondary instabilities Engineering Fluid Dynamics Computer Imaging, Vision, Pattern Recognition and Graphics Classical Continuum Physics Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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