An investigation of the near-wake flow structure of a cylinder with guiding plates

Fırat Ekinci, Erhan Fırat, Göktürk Ozkan, Hüseyin Akıllı

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Abstract

In this study, the flow behind a circular cylinder with a pair of outer identical guiding plates was investigated using particle image velocimetry (PIV) for various angular positions of the plates (i.e. α=±70°, ±100°, and ±130°). The gaps between these plates and cylinder are equal and are 0.3D. Experiments were carried out at a subcritical Reynolds (Re=ρ·U·D/μ) number of 7500, based on the cylinder diameter (D) and the flow velocity (U). The features of the near-wake with and without the guiding plates were interpreted in terms of patterns of time-averaged vorticity and streamlines, time-averaged and fluctuating velocity components. The spectral analysis was also carried out to determine the time-dependent variation of the transverse velocity at given locations in the near-wake. Two-dimensional computations of flow around circular cylinders with and without guiding plates have also been performed to predict the timeaveraged and root-mean-square of force coefficients of the various models. It was seen that the guiding plates at an appropriate angular position can lead to substantial attenuation, or retardation, of the process of large-scale vortex formation in the near-wake, thus can lead to vortex-induced vibration (VIV) suppression without any increase in drag.

Original languageEnglish
Article number02024
Number of pages6
JournalEPJ Web of Conferences
Volume180
DOIs
Publication statusPublished - 2018
EventEFM17 - Experimental Fluid Mechanics 2017 - Mikulov, Czech Republic
Duration: 21 Nov 201724 Nov 2017

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