The effects of nose-shape and upstream flow separation on the wake of a cylindrical square-backed body

Gershom Easanesan, David Burton, Mark C. Thompson

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Abstract

An experimental study was conducted on flow around two-dimensional, square-backed bluff bodies in the presence of a ground plane. Two frontal geometries were tested: one with significant leading-edge separation and one without. The extensive leading-edge separation was found to induce significant asymmetry in the time-averaged wake. One-sided shedding from the top trailing edge was found to occur in the absence of significant separation, but broad-spectrum turbulence was found to be responsible for much of the fluctuating energy. More pronounced upstream separation was found to further inhibit regular shedding of large-scale structures in the wake. Over the range considered, a degree of Reynolds number sensitivity was observed, with the boundary layer along the ground plane separating upstream of the body at low Reynolds numbers. The effect of increasing the ground clearance was also considered, which weakened the leading-edge separation whilst increasing the prominence of vortex shedding.

Original languageEnglish
Article number110142
Number of pages11
JournalExperimental Thermal and Fluid Science
Volume118
DOIs
Publication statusPublished - 1 Oct 2020

Keywords

  • Bluff body
  • Flow separation
  • Ground proximity
  • PIV
  • Square-back

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