PIV measurement downstream of perforated cylinder in deep water
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Tarih
2018
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
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.
Açıklama
Anahtar Kelimeler
Flow structure, Deep water, Perforated cylinder, Ply
Kaynak
European Journal of Mechanics B-Fluids
WoS Q Değeri
Q3
Scopus Q Değeri
Q1
Cilt
72