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Passively enhanced VIV responses of side-by-side cylinders at moderate Reynolds number

Irawan, Yosua Heru / Raza, Syed Ahmad / Chern, Ming-Jyh

Abstract Stationary upstream cylinders were used to enhance the response of vortex-induced vibration (VIV) of side-by-side (SBS) cylinders at Reynolds number Re = 1000. A modified direct-forcing immersed boundary (DFIB) with a large eddy simulation (LES) technique was employed to get the numerical solution. The VIV responses and VIVACE (vortex-induced vibration for aquatic clean energy) efficiency were investigated for various reduced velocities ( $U_{R}^{*}$ ) at a constant mass-damping ( $m^{*} ζ$ ). Furthermore, the influence of diameter ( $d^{*}$ ) and spacing ( $s^{*}$ ) of stationary upstream cylinders on the enhancement of amplitude response and VIVACE efficiency were analysed. The optimal upstream cylinder diameter and spacing were $d^{*}$ = 0.4 - 0.6 and $s^{*}$ $⩽$ 0.4. Within these ranges, the enhancement of amplitude response and efficiency was observed for $U_{R}^{*}$ $⩾$ 5.0, while the decrease in amplitude response and efficiency for $U_{R}^{*}$ = 4.0 – 4.5 was minimized.

Highlights • A modified DFIB with LES technique was employed to perform VIV simulation of multiple cylinders. • Stationary upstream cylinders were used to enhance the amplitude response and efficiency of VIVACE. • The optimal diameter and spacing of stationary upstream cylinders were proposed.

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Passively enhanced VIV responses of side-by-side cylinders at moderate Reynolds number

Irawan, Yosua Heru / Raza, Syed Ahmad / Chern, Ming-Jyh

Abstract Stationary upstream cylinders were used to enhance the response of vortex-induced vibration (VIV) of side-by-side (SBS) cylinders at Reynolds number Re = 1000. A modified direct-forcing immersed boundary (DFIB) with a large eddy simulation (LES) technique was employed to get the numerical solution. The VIV responses and VIVACE (vortex-induced vibration for aquatic clean energy) efficiency were investigated for various reduced velocities ( $U_{R}^{*}$ ) at a constant mass-damping ( $m^{*} ζ$ ). Furthermore, the influence of diameter ( $d^{*}$ ) and spacing ( $s^{*}$ ) of stationary upstream cylinders on the enhancement of amplitude response and VIVACE efficiency were analysed. The optimal upstream cylinder diameter and spacing were $d^{*}$ = 0.4 - 0.6 and $s^{*}$ $⩽$ 0.4. Within these ranges, the enhancement of amplitude response and efficiency was observed for $U_{R}^{*}$ $⩾$ 5.0, while the decrease in amplitude response and efficiency for $U_{R}^{*}$ = 4.0 – 4.5 was minimized.

Highlights • A modified DFIB with LES technique was employed to perform VIV simulation of multiple cylinders. • Stationary upstream cylinders were used to enhance the amplitude response and efficiency of VIVACE. • The optimal diameter and spacing of stationary upstream cylinders were proposed.

Passively enhanced VIV responses of side-by-side cylinders at moderate Reynolds number

Irawan, Yosua Heru / Raza, Syed Ahmad / Chern, Ming-Jyh

Abstract Stationary upstream cylinders were used to enhance the response of vortex-induced vibration (VIV) of side-by-side (SBS) cylinders at Reynolds number Re = 1000. A modified direct-forcing immersed boundary (DFIB) with a large eddy simulation (LES) technique was employed to get the numerical solution. The VIV responses and VIVACE (vortex-induced vibration for aquatic clean energy) efficiency were investigated for various reduced velocities ( $U_{R}^{*}$ ) at a constant mass-damping ( $m^{*} ζ$ ). Furthermore, the influence of diameter ( $d^{*}$ ) and spacing ( $s^{*}$ ) of stationary upstream cylinders on the enhancement of amplitude response and VIVACE efficiency were analysed. The optimal upstream cylinder diameter and spacing were $d^{*}$ = 0.4 - 0.6 and $s^{*}$ $⩽$ 0.4. Within these ranges, the enhancement of amplitude response and efficiency was observed for $U_{R}^{*}$ $⩾$ 5.0, while the decrease in amplitude response and efficiency for $U_{R}^{*}$ = 4.0 – 4.5 was minimized.

Highlights • A modified DFIB with LES technique was employed to perform VIV simulation of multiple cylinders. • Stationary upstream cylinders were used to enhance the amplitude response and efficiency of VIVACE. • The optimal diameter and spacing of stationary upstream cylinders were proposed.

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Title:

Passively enhanced VIV responses of side-by-side cylinders at moderate Reynolds number

Contributors:

Irawan, Yosua Heru (author) / Raza, Syed Ahmad (author) / Chern, Ming-Jyh (author)

Published in:

Applied Ocean Research ; 138

Publication date:

2023-07-13

ISSN:

DOI:

https://doi.org/10.1016/j.apor.2023.103668

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

Direct-forcing immersed boundary , Large eddy simulation , Vortex-induced vibration , Side-by-side cylinders , VIVACE

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