A study on the energy transfer of a square prism under fluid-elastic galloping

Jayatunga, Hewawasam Gamage Kasun Gayantha; Tan, Boon Thong; Leontini, Justin

doi:10.1016/j.jfluidstructs.2015.03.012

Cited by 8 publications

(4 citation statements)

References 25 publications

(26 reference statements)

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“…The amplitudes for the large mass ratios, μ = 100 and 500, are almost identical in the two configurations. This is consistent with the results obtained at high U r by Jayatunga et al (2015) using only the quasi-steady model for galloping and shows that the vortex force F v does not contribute to the response at high reduced velocity with large mass ratios.…”

Section: Resultssupporting

confidence: 91%

“…This is an important issue, as damping is known to affect the interaction between VIV and galloping (Parkinson & Smith 1964;Han et al 2021a). Moreover, in the applications in the field of energy harvesting from vibrations, the low mass ratio case is of practical interest, and damping is then a key parameter (Jayatunga et al 2015;Han et al 2021b).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

There is no critical mass ratio for galloping of a square cylinder under flow

Han

Langre

2021

J. Fluid Mech.

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The flow-induced vibration of square cylinders under flow is known to be caused by two distinct mechanisms of interaction: vortex-induced vibrations and galloping. In the present paper we address the issue of the apparent suppression of galloping when the mass ratio between the solid and the fluid is low enough. By using a reduced-order model that we validate on pre-existing results, we show that galloping is actually not suppressed, but delayed to higher values of the flow velocity. This is explained using a linear stability analysis where the competition between unstable modes is related to the transition between vortex-induced vibration and galloping. Direct numerical simulations coupled with a moving square cylinder confirm that galloping can be found even at very low mass ratios.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

There is no critical mass ratio for galloping of a square cylinder under flow

Han

Langre

2021

J. Fluid Mech.

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“…However, it cannot be concluded that the harvester is optimized. For an electromagnetic transducer, it is important for further investigate the circuitry load resistance and characteristics of the permanent magnet and coil (Jayatunga et al., 2015).…”

Section: Energy Extraction From Flow-induced Vibrationmentioning

confidence: 99%

Downstream flat plate as the flow-induced vibration enhancer for energy harvesting

Maruai

Ali

Ismail

et al. 2017

Journal of Vibration and Control

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The prospect of harvesting energy from flow-induced vibration using an elastic square cylinder with a detached flat plate is experimentally investigated. The feasibility of flow-induced vibration to supply an adequate base excitation for micro-scale electrical power generation is assessed through a series of wind tunnel tests. The current test model of a single square cylinder is verified through a comparable pattern of vibration amplitude response with previous experimental study and two-dimensional numerical simulations based on the unsteady Reynolds averaged Navier–Stokes (URANS). In addition, a downstream flat plate is included in the wake of the square cylinder to study the effects of wake interference upon flow-induced vibration. A downstream flat plate is introduced as the passive vibration control to enhance the magnitude of flow-induced vibration and simultaneously increases the prospect of harvesting energy from the airflow. The study is conducted by varying the gap separation between the square cylinder and flat plate for 0.1≤ G/ D ≤3. The highest peak amplitude is observed for the gap G/ D = 1.2 with yrms/ D = 0.46 at UR = 17, which is expected to harvest ten times more energy than the single square cylinder. The high amplitude vibration response is sustained within a relatively broader range of lock-in synchronization. Meanwhile, for G/ D = 2 the vibration is suppressed, which leads to a lower magnitude of harvested energy. Contrarily, the amplitude response pattern for G/ D = 3 is in agreement with the single square cylinder. Hence, the flat plate has no significance to the wake interference of the square cylinder when the gap separation is beyond 3 D.

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“…Electromagnetic transducer converts the mechanical power from relative motion of permanent magnet and coil into electricity 78 . For electromagnetic transducer, further investigation on the circuitry load resistance and characteristic of the permanent magnet and coil is necessary 38 , 79 . Due to its small inertial mass, the power harvested from this transducer is small and limited for micro scale application 78 .…”

Section: Methodsmentioning

confidence: 99%

The influence of different downstream plate length towards the flow-induced vibration on a square cylinder

Maruai,

Ali,

Zaki

et al. 2023

Sci Rep

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The investigations of flow-induced vibration have been around for decades to solve many engineering problems related to structural element. In a hindsight of advancing technology of microelectronics devices, the implementation of flow-induced vibration for energy harvesting is intrigued. The influence of downstream flat plate to flow-induced vibration experienced by a square cylinder is discussed in this study to surpass the limitation of wind energy due to geographical constraints and climate change. The mechanism of flow-induced vibration experienced by a square cylinder with downstream flat plate is numerically simulated based on the unsteady Reynolds Navier–Stokes (URANS) flow field. The Reynolds number, Re assigned in this study is ranging between $$4.2 \times 10^3$$ 4.2 × 10 3 –$$10.7 \times 10^3$$ 10.7 × 10 3 and the mass damping ratio designated for the square cylinder is $$m^*\zeta$$ m ∗ ζ = 2.48. The influence of three different flat plate lengths $$w/D = 0.5$$ w / D = 0.5 , 1 and 3 is examined. Each case of different flat plate is explored for gap separation between the square cylinder and the plate in the range $$0.5 \leqslant G/D \leqslant 3$$ 0.5 ⩽ G / D ⩽ 3 . Based on the numerical findings, the configuration of cylinder-flat plate with length $$w/D = 1$$ w / D = 1 has shown the highest potential to harvest high energy at comparatively low reduced velocity.

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A study on the energy transfer of a square prism under fluid-elastic galloping

Cited by 8 publications

References 25 publications

There is no critical mass ratio for galloping of a square cylinder under flow

There is no critical mass ratio for galloping of a square cylinder under flow

Downstream flat plate as the flow-induced vibration enhancer for energy harvesting

The influence of different downstream plate length towards the flow-induced vibration on a square cylinder

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