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

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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.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Pontifícia Universidade Católica do Rio de Janeiro, Rua Marquêz de São Vicente 225, Rio de Janeiro, RJ 22451–900, Brazil

    Juan José Cruz Villanueva & Luís Fernando Figueira da Silva

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  1. Juan José Cruz Villanueva
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  2. Luís Fernando Figueira da Silva
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Correspondence to Juan José Cruz Villanueva.

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Cruz Villanueva, J.J., Figueira da Silva, L.F. Study of the Turbulent Velocity Field in the Near Wake of a Bluff Body. Flow Turbulence Combust 97, 715–728 (2016). https://doi.org/10.1007/s10494-016-9709-6

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  • DOI: https://doi.org/10.1007/s10494-016-9709-6

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