Control of flow structure in the wake region of circular cylinder with meshy wire in deep water


Creative Commons License

Oguz B., AKAR M. A. , PINAR E. , AKILLI H. , ŞAHİN B.

PAMUKKALE UNIVERSITY JOURNAL OF ENGINEERING SCIENCES-PAMUKKALE UNIVERSITESI MUHENDISLIK BILIMLERI DERGISI, cilt.22, ss.280-284, 2016 (ESCI İndekslerine Giren Dergi) identifier

  • Cilt numarası: 22 Konu: 4
  • Basım Tarihi: 2016
  • Doi Numarası: 10.5505/pajes.2016.41033
  • Dergi Adı: PAMUKKALE UNIVERSITY JOURNAL OF ENGINEERING SCIENCES-PAMUKKALE UNIVERSITESI MUHENDISLIK BILIMLERI DERGISI
  • Sayfa Sayısı: ss.280-284

Özet

In this study the aim is decreasing the effect and the intensity of the temporary loads resulted from vortex shedding that have an impact on the cylinder (chimneys, high buildings etc.) located in deep water and the object or objects in the wake region and definition of the optimum values (wire thickness and porosity..) With different thickness and different porosity ratios the effect of meshy wire that surrounded a circular cylinder of D=50 mm diameter was observed at Re-D=5000. The porosity ratios were four different values between a range of beta=0.5-0.8 with an interval of 0.1. The thicknesses of wire were 1 mm, 2 mm, 3 mm and 4 mm. The flow structure in the wake region of circular cylinder was tried to be controlled by meshy wire that surrounded the cylinder. Experiments were carried out by using particle image velocimetry (PIV) technique. Comparing with bare cylinder results, turbulence kinetic energy (TKE) and Reynolds shear stress values increase with wire thicknesses of beta =1 mm, 2 mm for all porosity ratios and decrease with beta = 3 mm, 4 mm. With porosity ratio of beta=0.6 and wire thickness of beta = 4 mm TKE and Reynolds shear stress results show that meshy wire controls the flow in the wake region of the cylinder. Frequency value results also define that best flow control is obtained with beta = 0.6 and beta = 4 mm.