Flow characteristics and passive flow control of circular cylinders with triangular vortex generators: An experimental investigation

Aksoy, Muharrem Hilmi

doi:10.1016/j.apor.2023.103836

Cited by 4 publications

(1 citation statement)

References 75 publications

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“…In the past few decades, flows around cylinders have been extensively investigated by experiments [4,5] and the numerical method [6,7]. For example, Duan and Wan [8] numerically analyzed the wake characteristics of flows around a circular cylinder at Re = 3900.…”

Section: Introductionmentioning

confidence: 99%

Wake Structures and Hydrodynamic Characteristics of Flows around Two Near-Wall Cylinders in Tandem and Parallel Arrangements

Chang,

Yin,

Xin

et al. 2024

JMSE

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To clarify the hydrodynamic interference characteristics of flows around multiple cylinders under the wall effect, the two-dimensional (2D) flows around the near-wall single, two tandem and parallel cylinders are simulated under different gap ratios (0.15 ≤ G/D ≤ 3.0) and spacing ratios (1.5 ≤ T/D ≤ 4.0) at a Reynolds number of Re = 6300. We also examine the wake patterns, the force coefficients, and the vortex-shedding frequency with emphases on the wall effect and effects of the two-cylinder interference. A critical wall gap of G/D = 0.6 is identified in the single-cylinder case where the wall can exert significant influences. The two near-wall tandem cylinders exhibit three wake states: stretching mode, attachment mode, and impinging mode. The force coefficients on the upstream cylinder are significantly affected by the wall for G/D ≤ 0.6. The downstream cylinder is mainly influenced by the upstream cylinder. For G/D > 0.6, the force coefficients on the two cylinders exhibit a similar variation trend. In the parallel arrangement, the two cylinders exhibit four wake states in different G/D and T/D ranges: double stretching mode, hetero-vortex scale mode, unilateral vortex mode, and free vortex mode. Moreover, the two parallel cylinders in the hetero-vortex scale or free vortex mode have two states: synchronous in-phase state and synchronous out-of-phase state. The mean drag coefficients on the two cylinders decrease, while the mean lift coefficients exhibit opposite variation trends, as the T/D grows.

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Section: Introductionmentioning

confidence: 99%

Wake Structures and Hydrodynamic Characteristics of Flows around Two Near-Wall Cylinders in Tandem and Parallel Arrangements

Chang,

Yin,

Xin

et al. 2024

JMSE

View full text Add to dashboard Cite

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Experimental investigation on energy conversion and vortex-induced vibration suppression of marine risers with turbine-type external devices

Li,

Hao,

Liu

et al. 2025

Energy

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The groove effect on wake characteristics of rotating cylinders

Yagmur,

Aksoy,

Dogan

et al. 2024

Physics of Fluids

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In the present study, active and passive flow control methods have been implemented to investigate their effects on the wake flow structures of a circular cylinder. Grooves having circular, rectangular, and triangular cross sections have been applied to the cylinders exposed to the rotation rates, α, from 0 to 0.79. The experiments have been conducted by particle image velocimetry at a Reynolds number of Re = 5 × 103. The contour graphics of time-averaged results have been presented. Moreover, the variations in velocity profiles have also been depicted. The experimental results revealed significant variations for flow patterns, wake structures, and turbulence parameters due to the effects of both groove geometries and rotational motion. In the stationary cases, for turbulence intensity, the circular grooved cylinder exhibited a 15% increase, while the triangular grooved cylinder showed a slightly higher increase of around 20% compared to that of the bare cylinder (BC). Conversely, in non-stationary cases, the rectangular grooved cylinder displayed the most prominent reduction in turbulence intensity, decreasing by approximately 10% compared to that of the BC. The groove type has considerably affected the flow structures of the wake regions, especially for the lower rotation rates.

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Flow characteristics and passive flow control of circular cylinders with triangular vortex generators: An experimental investigation

Cited by 4 publications

References 75 publications

Wake Structures and Hydrodynamic Characteristics of Flows around Two Near-Wall Cylinders in Tandem and Parallel Arrangements

Wake Structures and Hydrodynamic Characteristics of Flows around Two Near-Wall Cylinders in Tandem and Parallel Arrangements

Experimental investigation on energy conversion and vortex-induced vibration suppression of marine risers with turbine-type external devices

The groove effect on wake characteristics of rotating cylinders

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