The Effect of Slat Opening on Vortex Shedding Behind a Circular Cylinder
M.R.A. Misman1, A.M. Azmi2, Z.A. Kamarulbaharin3, A.H.A. Hamid4
1Muhammad Rafiq Adha Misman, Faculty of Mechanical Engineering, Universiti Teknologi MARA, Shah Alam, Malaysia.
2Azlin Mohd Azmi*, Faculty of Mechanical Engineering, Universiti Teknologi MARA, Shah Alam, Malaysia.
3Zainal Abidin Kamarul Baharin, Faculty of Mechanical Engineering, Universiti Teknologi MARA, Shah Alam, Malaysia.
4Ahmed Hussein Abdul Hamid, Faculty of Mechanical Engineering, Universiti Teknologi MARA, Shah Alam, Malaysia.

Manuscript received on November 20, 2019. | Revised Manuscript received on November 28, 2019. | Manuscript published on 30 November, 2019. | PP: 6879-6985 | Volume-8 Issue-4, November 2019. | Retrieval Number: D5210118419/2019©BEIESP | DOI: 10.35940/ijrte.D5210.118419

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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: Add-on devices are widely used as one of the means of suppressing vortex induced vibrations from bluff bodies. The present study numerically investigates flow over a circular cylinder attached by an axial slat. The axial slat were of uniform and non-uniform openings of 67% and 44% porosity. The governing equation was solved using viscous-laminar model at Reynolds number, Re=300. It was found that the presence of the axial slats significantly suppressed vortex shedding behind the circular cylinder. The non-uniform slats showed longer vortex formation length with lower drag, in comparison to that of the uniform slats. In addition, the slats with 67% porosity of both uniform and non-uniform openings suppressed vortex better than that of 44% porosity slats, indicated by the longer vortex formation length and weaker intensity of vortices.
Keywords: Axial Slat, Shroud, Vortex Shedding, VIV.
Scope of the Article:  Vortex.