Control of flows around bluff bodies mediated by porous materials

Sakineh Sadeghipour, Syamir Alihan Showkat Ali, Xiao Liu, Mahdi Azarpeyvand, Graham R. Thorpe

Research output: Contribution to journalArticle (Academic Journal)

2 Citations (Scopus)
1 Downloads (Pure)

Abstract

There is evidence that the application of porous media to the surfaces of bluff bodies immersed in turbulent fluid flows has a profound effect on the associated aerodynamic phenomena. This idea is explored by performing a series of experiments on cylinders that have circular, square and rectangular cross sections. The flow fields were established around circular cylinders that had been encased in porous media, and which retained the same dimensions of the bare cylinder. The square and rectangular bluff bodies were modified so that their upstream and downstream halves consisted of solid and porous materials respectively. It is found that the porous media applied to the circular cylinder had the most effect on the wake, and the largest effect was observed in the wake generated by the most permeable material. The principal effect of the porous media was to cause the eyes of the recirculation region to be located further downstream. The effect of the permeability is increasingly diminished in the square and rectangular geometries. The presence of the porous media also had a significant effect on the Reynolds stresses. The effect of the porous media applied is to damp the normal stresses further downstream of the bluff bodies.
Original languageEnglish
Article number110048
Number of pages14
JournalExperimental Thermal and Fluid Science
Volume114
Early online date25 Jan 2020
DOIs
Publication statusPublished - 1 Jun 2020

Keywords

  • Bluff body
  • Porous
  • Flow control
  • Turbulent flow
  • Particle Image Velocimetry

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