A review on the progress and research directions of ocean engineering

Ocean Engineering, Journal Year: 2023, Volume and Issue: 272, P. 113617 - 113617

Published: Feb. 16, 2023

This paper reviews research in ocean engineering over the last 50+ years with aim to (I) understand technological challenges and evolution field, (II) investigate whether studies meet present global demands, (III) explore new scientific/engineering tools that may suggest pragmatic solutions problems, (IV) identify management gaps, way forward. Six major divisions are identified, namely Ocean Hydrodynamics, Risk Assessment Safety, Climate Geophysics: Data Models, Control Automation Ocean, (V) Structural Engineering Manufacturing for (VI) Renewable Energy. As much as practically possible sub-divisions of field also identified. It is highlighted topics dealing renewable energy, control path tracking ships, well computational modelling wave-induced motions growing. Updating forecasting energy resources, developing methods wave generation, introducing novel optimised converters potential opportunities. Ongoing follow needs environmentally friendly energies, though engineering-based often tend overlook longer-term influence climate change. Development exploitation focus on continuum mechanics problems remain relevant. Notwithstanding this, machine learning attracting attention researchers. Analysis COVID-19 transmission onboard rarely conducted, 3D printing-based still need more from

Language: Английский

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A review of recent studies on the control of vortex-induced vibration of circular cylinders

Ocean Engineering, Journal Year: 2023, Volume and Issue: 285, P. 115389 - 115389

Published: July 22, 2023

Recent studies of passive and active flow control devices for suppressing vortex-induced vibration (VIV) circular cylinders are reviewed extensively. The include splitter plates, rods, helical strakes, porous layers rough surfaces, the jet flow, rotating cylinder, rods. A plate with a certain length can suppress VIV but very long cause galloping. One or two rods located downstream separation points VIV. suppression using three to eight were also studied increasing rod number improve effectiveness. Porous sufficient porosity thickness achieve nearly full generally have better effect than surfaces. Helical strakes well when its pitch ratio is greater 10 height 0.2 times cylinder diameter. If external energy used, suppression. Rotating in one direction but, another direction, enhance Some important conclusions highlighted section 4 this paper.

Language: Английский

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A review of experiments on stationary bluff body wakes

Physics of Fluids, Journal Year: 2022, Volume and Issue: 34(1)

Published: Jan. 1, 2022

Experimental studies dealing with the wake of isolated stationary bluff bodies are reviewed. After briefly recalling pioneering works in this domain, paper focuses on recent research conducted latest experimental methods and techniques. The review encompasses a range topics, including effects body geometry (non-circular cross sections non-uniformity spanwise direction), steady unsteady (periodic non-periodic) inflow conditions, surface proximity (rigid wall, confinement, water free surface) non-Newtonian fluids. Focus is brought to flow physics wakes, especially complex three-dimensional oscillatory behaviors induced by periodic vortex shedding phenomenon. aims offer critical systematic new knowledge findings subject area, as well most frequently adopted also helps identifying gaps literature that need be addressed future investigations.

Language: Английский

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Flexible cylinder flow-induced vibration

Physics of Fluids, Journal Year: 2022, Volume and Issue: 34(1)

Published: Jan. 1, 2022

In this paper, we conducted a selective review on the recent progress in physics insight and modeling of flexible cylinder flow-induced vibrations (FIVs). FIVs circular cylinders include vortex-induced (VIVs) wake-induced (WIVs), they have been center fluid-structure interaction (FSI) research past several decades due to rich engineering significance. First, summarized new understanding structural response, hydrodynamics, impact key properties for both isolated multiple cylinders. The complex FSI phenomena observed experiments numerical simulations are explained carefully via analysis vortical wake topology. Following up with critical future questions address, discussed advancement artificial intelligent machine learning (AI/ML) techniques improving FIVs. Though early stages, AL/ML shown success, including auto-identification VIV features, physics-informed neural network solving inverse problems, Gaussian process regression automatic adaptive experiments, multi-fidelity prediction accuracy quantifying uncertainties. These preliminary yet promising results demonstrated opportunities challenges today's big data era.

Language: Английский

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Recent advances in understanding the flow over bluff bodies with different geometries at moderate Reynolds numbers

Ocean Engineering, Journal Year: 2022, Volume and Issue: 261, P. 111611 - 111611

Published: Aug. 13, 2022

The application of unsteady incompressible flow phenomenon over the bluff bodies has received attention many researchers due to rich and complex physics underpinning these flows, thus requiring special in their modelling numerical simulations. wake that forms at leeside body is particular interest. Reynolds number geometry are turn two prominent parameters govern formation subsequent behaviour this wake. This paper reviews formations for different cylindrical cross-sections such as circular, elliptical, helically twisted symmetric wavy, asymmetric harbor seal vibrissae cylinders. Alongside geometrical shape, impacts rotational rate, aspect ratio, angle attack, gap ratio between cylinder bottom wall on hydrodynamic coefficients, Strouhal number, recirculation length suppression vortex shedding investigated. In addition, variation coefficients shapes compared. Finally, concluding remarks drawn based recent advances understanding features predictions with CFD methods.

Language: Английский

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Enhanced performance of piezoelectric energy harvester by two asymmetrical splitter plates

Ocean Engineering, Journal Year: 2023, Volume and Issue: 270, P. 113614 - 113614

Published: Jan. 6, 2023

Language: Английский

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Passive fluid-induced vibration control of viscoelastic cylinder using nonlinear energy sink

Marine Structures, Journal Year: 2021, Volume and Issue: 81, P. 103116 - 103116

Published: Nov. 8, 2021

Language: Английский

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Control of flow-induced vibration of a circular cylinder using a splitter plate

Physics of Fluids, Journal Year: 2023, Volume and Issue: 35(8)

Published: Aug. 1, 2023

A circular cylinder attached by a rigid splitter plate of different lengths was tested to examine its effects on the control flow-induced vibration. Tests were carried out in closed-loop water channel. diameter D = 20 mm and mass ratio m* ≈ 50 installed oscillate transverse direction. wide range length considered, i.e., L/D 0–3.5, at reduced velocity Ur 1–25 Reynolds number Re 800–11 000. Numerical simulations also conducted reveal flow structures associated with vibration modes observed experiment. It is found that, as increases from 0 0.25, peak value oscillation amplitude appears higher velocities. When continues rise, galloping-type oscillations occur 0.5 0.75. The transition stage has been 1.0. Oscillation then significantly suppressed when larger than 1.5.

Language: Английский

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Vortex-induced vibrations of tandem diamond cylinders: A novel lock-in behavior

International Journal of Mechanical Sciences, Journal Year: 2023, Volume and Issue: 255, P. 108463 - 108463

Published: May 17, 2023

Language: Английский

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A review on vortex-induced vibrations in confined flows

Ocean Engineering, Journal Year: 2023, Volume and Issue: 285, P. 115309 - 115309

Published: July 10, 2023

Language: Английский

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