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• W3179976504 endingPage "109400" @default.
• W3179976504 startingPage "109400" @default.
• W3179976504 abstract "Confinement can be considered as a passive method for controlling the vortex shedding behind bluff bodies. However, this technique is often accompanied with a considerable drag increase as a penalty. This paper is aimed at investigating the effects of divergence ratio (DR) from 0.2 to 1.2 on flow characteristics (instantaneous aerodynamic coefficients, time-mean drag coefficient, Strouhal number and rms value of lift coefficient) and flow topology (vorticity contour and streamlines) around a confined square cylinder at a Reynolds number of 100. Furthermore, the critical Reynolds number where the onset of vortex shedding happens is determined for all diverged channels. The results indicate that vortex shedding is completely suppressed for channels with 0.26 ≤ DR ≤ 0.45. For the channel with DR = 0.26, a drag reduction has been achieved and the drag coefficient of the square cylinder reduces by 18.85% in comparison with that of the unbounded cylinder at Re = 100. Furthermore, the critical Reynolds number which is determined to be 49 for the unconfined square cylinder is delayed to 101 in this channel. It is also found that the drag coefficient, the rms value of lift coefficient and Strouhal number increase with divergence ratio while the vortex formation length and the wake width generally decrease. • The effects of channel divergence ratio (DR) on flow characteristics around a confined square cylinder are investigated. • The vortex shedding is completely suppressed for channels with 0.26 = DR ≤ 0.45. • The drag coefficient of the channel with DR = 0.26 is 18.85% less than the unbounded case at Re = 100. • The drag coefficient, rms value of lift coefficient and Strouhal number generally increase with divergence ratio. • The vortex formation length and the wake width generally decrease with divergence ratio." @default.
• W3179976504 created "2021-07-19" @default.
• W3179976504 creator A5048669607 @default.
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• W3179976504 date "2021-09-01" @default.
• W3179976504 modified "2023-10-16" @default.
• W3179976504 title "Suppression of vortex shedding behind a square cylinder confined in a diverging channel" @default.
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• W3179976504 doi "https://doi.org/10.1016/j.oceaneng.2021.109400" @default.
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