Experimental study on the wake behind tapered circular cylinders

Research output: Contribution to journalArticleResearchpeer review

Authors

  • Jan Visscher
  • Bjørnar Pettersen
  • Helge I. Andersson

External Research Organisations

  • Norwegian University of Science and Technology (NTNU)
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Details

Original languageEnglish
Pages (from-to)1228-1237
Number of pages10
JournalJournal of fluids and structures
Volume27
Issue number8
Early online date15 Aug 2011
Publication statusPublished - Nov 2011
Externally publishedYes

Abstract

The flow around tapered cylinders can act as basic models for numerous bluff body flows with a spanwise variation of either the body shape or the inflow conditions. The well-known vortex street is influenced by strong three-dimensional effects from the spanwise variation of the shedding frequency, namely oblique vortex shedding and vortex dislocations. Stereo-PIV was chosen to study these phenomena, since it allows analyzing planes with the full three-component, instantaneous velocity fields and local, time-dependent variations in the same setting. Hence, detailed aspects of the vortex dislocation phenomenon are presented. Single vortex dislocation events are presented through the local variation of the three measured velocity components u, v and w. Longer time-series reveal both period and location of these dislocation events, as well as quantity and sizes of the cells of constant shedding velocity in between them. The influence of the Reynolds number and the cylinder aspect ratio on the vortex cells could be shown. The analysis of the vortex shedding behavior shows good agreement with previously published results. At the same time, the applied PIV technique provides more spatial information than point-based measurements and offers insight into a Reynolds number range that is currently out of reach of Direct Numerical Simulations.

Keywords

    Cellular vortex shedding, Non-uniform cylinders, PIV, Turbulent

ASJC Scopus subject areas

Cite this

Experimental study on the wake behind tapered circular cylinders. / Visscher, Jan; Pettersen, Bjørnar; Andersson, Helge I.
In: Journal of fluids and structures, Vol. 27, No. 8, 11.2011, p. 1228-1237.

Research output: Contribution to journalArticleResearchpeer review

Visscher J, Pettersen B, Andersson HI. Experimental study on the wake behind tapered circular cylinders. Journal of fluids and structures. 2011 Nov;27(8):1228-1237. Epub 2011 Aug 15. doi: 10.1016/j.jfluidstructs.2011.07.002
Visscher, Jan ; Pettersen, Bjørnar ; Andersson, Helge I. / Experimental study on the wake behind tapered circular cylinders. In: Journal of fluids and structures. 2011 ; Vol. 27, No. 8. pp. 1228-1237.
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