PIV measurement downstream of perforated cylinder in deep water

DURHASAN T., PINAR E., ÖZKAN G. M., Aksoy M. M., AKILLI H., ŞAHİN B.

EUROPEAN JOURNAL OF MECHANICS B-FLUIDS, vol.72, pp.225-234, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 72
  • Publication Date: 2018
  • Doi Number: 10.1016/j.euromechflu.2018.06.001
  • Journal Name: EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.225-234
  • Keywords: Flow structure, Deep water, Perforated cylinder, Ply, VORTEX-INDUCED VIBRATIONS, CIRCULAR-CYLINDER, SHALLOW-WATER, PASSIVE CONTROL, FLOW CHARACTERISTICS, WAKE FLOW, SUPPRESSION, ROUGHNESS, FAIRINGS, PLATES
  • Çukurova University Affiliated: Yes

Abstract

The flow structure of perforated circular cylinders was thoroughly scrutinized by using the technique of high-image-density Particle Image Velocimetry (Ply). The perforated circular cylinder diameter (D = 100 mm), was kept constant during the experimental investigation and corresponding Reynolds number was Re = 10 000 based on the cylinder diameter. Turbulent statistics e.g., planar turbulent kinetic energy, stream-wise Reynolds normal stress, transverse Reynolds normal stress and Reynolds shear stress were computed in the wake region in order to reveal the differences among various porosities in the range of 0.25 <= beta <= 0.80. It would be noted that by increasing porosity, beta the flow fluctuations are substantially reduced in the wake region according to the PIV results. As a result, the prevention of Karman Vortex Street was accomplished by the use of perforated cylinders because of elongated and fragmented shear layers and reduced magnitudes of vortices. (C) 2018 Elsevier Masson SAS. All rights reserved.