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Numerical predictions of vibration responses and flow energy conversion efficiency of side-by-side cylinders at moderate Reynolds number
https://orcid.org/0000-0001-9615-3447
https://orcid.org/0000-0003-2756-5020
https://orcid.org/0000-0002-7815-9455
Abstract Vortex-induced vibration (VIV) of two circular cylinders in a side-by-side (SBS) configuration was modelled using three-dimensional numerical simulation at Reynolds number Re = 1,000. The VIV parameter values used for the study were mass ratio, = 10.0, damping ratio, = 0.01, and a range of reduced velocities, = 2.0 to 10.0. Various VIV responses were investigated, such as amplitude, frequency, and response correlation for gap ratios 1.0 3.0. Moreover, the efficiency of flow energy conversion was determined to assess the potential of this configuration for VIVACE (Vortex-Induced Vibration Aquatic Clean Energy). For comparison, the VIV responses and efficiency of the single-cylinder case were also presented with identical variables. It was found that the optimal gap ratio between the SBS cylinders was in the interval of 1.0 1.2. A significant increase in efficiency occurred in the initial excitation region between 4.0 5.0. Above this range, the efficiency was less than that of a single cylinder. In the case of SBS cylinders, the soft lock-in appeared to start early. The anti-phase correlation led to a significant increase in the vibration response as well as efficiency. The increase in maximum efficiency was more than twofold.
Highlights A DFIB technique and LES were used to model the VIV of SBS cylinders. The VIV responses were analysed together with the efficiency of VIVACE. A soft lock-in was observed for the case of SBS cylinders. The efficiency of VIVACE showed a significant increase in the initial branch.
Numerical predictions of vibration responses and flow energy conversion efficiency of side-by-side cylinders at moderate Reynolds number
https://orcid.org/0000-0001-9615-3447
https://orcid.org/0000-0003-2756-5020
https://orcid.org/0000-0002-7815-9455
Abstract Vortex-induced vibration (VIV) of two circular cylinders in a side-by-side (SBS) configuration was modelled using three-dimensional numerical simulation at Reynolds number Re = 1,000. The VIV parameter values used for the study were mass ratio, = 10.0, damping ratio, = 0.01, and a range of reduced velocities, = 2.0 to 10.0. Various VIV responses were investigated, such as amplitude, frequency, and response correlation for gap ratios 1.0 3.0. Moreover, the efficiency of flow energy conversion was determined to assess the potential of this configuration for VIVACE (Vortex-Induced Vibration Aquatic Clean Energy). For comparison, the VIV responses and efficiency of the single-cylinder case were also presented with identical variables. It was found that the optimal gap ratio between the SBS cylinders was in the interval of 1.0 1.2. A significant increase in efficiency occurred in the initial excitation region between 4.0 5.0. Above this range, the efficiency was less than that of a single cylinder. In the case of SBS cylinders, the soft lock-in appeared to start early. The anti-phase correlation led to a significant increase in the vibration response as well as efficiency. The increase in maximum efficiency was more than twofold.
Highlights A DFIB technique and LES were used to model the VIV of SBS cylinders. The VIV responses were analysed together with the efficiency of VIVACE. A soft lock-in was observed for the case of SBS cylinders. The efficiency of VIVACE showed a significant increase in the initial branch.
Numerical predictions of vibration responses and flow energy conversion efficiency of side-by-side cylinders at moderate Reynolds number
https://orcid.org/0000-0001-9615-3447
https://orcid.org/0000-0003-2756-5020
https://orcid.org/0000-0002-7815-9455
Abstract Vortex-induced vibration (VIV) of two circular cylinders in a side-by-side (SBS) configuration was modelled using three-dimensional numerical simulation at Reynolds number Re = 1,000. The VIV parameter values used for the study were mass ratio, = 10.0, damping ratio, = 0.01, and a range of reduced velocities, = 2.0 to 10.0. Various VIV responses were investigated, such as amplitude, frequency, and response correlation for gap ratios 1.0 3.0. Moreover, the efficiency of flow energy conversion was determined to assess the potential of this configuration for VIVACE (Vortex-Induced Vibration Aquatic Clean Energy). For comparison, the VIV responses and efficiency of the single-cylinder case were also presented with identical variables. It was found that the optimal gap ratio between the SBS cylinders was in the interval of 1.0 1.2. A significant increase in efficiency occurred in the initial excitation region between 4.0 5.0. Above this range, the efficiency was less than that of a single cylinder. In the case of SBS cylinders, the soft lock-in appeared to start early. The anti-phase correlation led to a significant increase in the vibration response as well as efficiency. The increase in maximum efficiency was more than twofold.
Highlights A DFIB technique and LES were used to model the VIV of SBS cylinders. The VIV responses were analysed together with the efficiency of VIVACE. A soft lock-in was observed for the case of SBS cylinders. The efficiency of VIVACE showed a significant increase in the initial branch.
Numerical predictions of vibration responses and flow energy conversion efficiency of side-by-side cylinders at moderate Reynolds number
Irawan, Yosua Heru (author) / Raza, Syed Ahmad (author) / Chern, Ming-Jyh (author)
Applied Ocean Research ; 129
2022-10-20
Article (Journal)
Electronic Resource
English
| British Library Conference Proceedings | 2008