Study of the Turbulent Velocity Field in the Near Wake of a Bluff Body

Juan José Cruz Villanueva, Luís Fernando Figueira da Silva

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

An experimental characterization of the turbulent flow structure formed downstream of a vertically mounted circular bluff body is performed. Three components of an instantaneous velocity field are measured using the stereo particle image velocimetry technique at the symmetry plane. The average velocity and the turbulent properties are analyzed. The results indicate a recirculation zone consisting of a toroidal vortex with similar dimensions for all Reynolds numbers. The largest turbulent fluctuations are found at the stagnation point region. The observed anisotropy of the normal Reynolds stress components is associated with the stagnation point flow, whereas the cross-correlation component extreme occurs in high strain rate regions. An analysis of the Reynolds tensor anisotropy using the Lumley triangle is performed, revealing that the largest departures from isotropy occur at high shear regions and also within the vortex.

Original languageEnglish
Pages (from-to)715-728
Number of pages14
JournalFlow, Turbulence and Combustion
Volume97
Issue number3
DOIs
StatePublished - 1 Oct 2016
Externally publishedYes

Keywords

  • Anisotropy
  • Lumley triangle
  • PIV
  • Reynolds stresses
  • Wake flow

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