An experimental and numerical study of the resonant flow between a hull and a wall

Milne, Ian; Kimmoun, Olivier; Graham, J. M. R.; Molin, Bernard

doi:10.1017/jfm.2021.877

Cited by 12 publications

(4 citation statements)

References 19 publications

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“…For instance, immediate activation of thrusters to stabilize vessel motions requires knowledge of immediate winds so we look to models with best , whereas go/no–go decisions for offloading of vessel product require knowledge of the winds for up to 48 hr ahead of time, so we analyze for . Quantifying the uncertainty of wind is vital to all of these operations as small changes in wind speed and direction can have large effects on vessel heading (Delivré et al, 2022), which in turn can lead to problematic effects such as gap resonance (Zhao et al, 2018b; Milne et al, 2022) and severe vessel motions such as resonant roll and heave (Milne et al, 2016).…”

Section: Case Study: Wind Data On Australia’s Nwsmentioning

confidence: 99%

Evaluating probabilistic forecasts for maritime engineering operations

Astfalck

Bertolacci

Cripps

2023

DCE

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Maritime engineering relies on model forecasts for many different processes, including meteorological and oceanographic forcings, structural responses, and energy demands. Understanding the performance and evaluation of such forecasting models is crucial in instilling reliability in maritime operations. Evaluation metrics that assess the point accuracy of the forecast (such as root-mean-squared error) are commonplace, but with the increased uptake of probabilistic forecasting methods such evaluation metrics may not consider the full forecasting distribution. The statistical theory of proper scoring rules provides a framework in which to score and compare competing probabilistic forecasts, but it is seldom appealed to in applications. This translational paper presents the underlying theory and principles of proper scoring rules, develops a simple panel of rules that may be used to robustly evaluate the performance of competing probabilistic forecasts, and demonstrates this with an application to forecasting surface winds at an asset on Australia’s North–West Shelf. Where appropriate, we relate the statistical theory to common requirements by maritime engineering industry. The case study is from a body of work that was undertaken to quantify the value resulting from an operational forecasting product and is a clear demonstration of the downstream impacts that statistical and data science methods can have in maritime engineering operations.

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Section: Case Study: Wind Data On Australia’s Nwsmentioning

confidence: 99%

Evaluating probabilistic forecasts for maritime engineering operations

Astfalck

Bertolacci

Cripps

2023

DCE

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“…Tan et al (2019) proposed a viscous damping model for fluid resonance in the moonpool, where the damping induced by the flow separation and wall friction was considered by the local and frictional loss coefficients, respectively. Milne et al (2022) conducted a series of experimental measurements on the fluid resonance problem, and the vortex shedding from the sharp bilge edge is demonstrated to give rise to a quadratically damped free surface resonance.…”

Section: Introductionmentioning

confidence: 99%

Hysteresis phenomenon of the sloshing-mode resonance in a moonpool induced by rolling motion excitations

Jiang,

Bai,

2024

Physics of Fluids

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Sloshing-mode resonance in the moonpool induced by roll motion excitations is investigated numerically using the OpenFOAM® package. Nonlinear characteristics of the sloshing-mode resonance are the main focus of the present study. When the roll motion excitation has a time-invariant amplitude, a typical softening spring behavior can be observed in the variation of free surface amplitude against the excitation frequency, including the decreased resonant amplitude and the jump frequency. Furthermore, the dimensionless jump frequency is independent of the moonpool breadth and draft in this situation. The hysteresis phenomenon is clearly observed under the roll excitation with varying amplitudes, where the phase locked-in mechanism is the essential reason for this phenomenon. The hysteresis loop is located between two jump frequencies by the accelerating and decelerating excitations that generate the lower and upper branches, respectively. With the increase in moonpool breadth, the decreased upper branch frequency and unchanged lower branch frequency are observed, leading to the increased region of the hysteresis loop. The variation of the moonpool draft has an insignificant effect on the region of the hysteresis loop.

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“…The gap resonance occurs when the wave excitation frequency is close to the natural frequency of fluid bulk within the gap, and it has been observed and confirmed in quasi-2D model tests in narrow wave flumes. 5, [16][17][18][19][20][21][22] Although relatively fewer, 3D model tests of side-byside vessels have also been performed by, for instance Refs. 23-28. In general, two types of resonances can be categorized: (i) piston-mode resonance where the fluid bulk in the gap moves vertically as an oscillatory water column, and (ii) sloshing resonances where standing a) Electronic mail: yshao@mek.dtu.dk waves are formed at the free surface in the gap.…”

Section: Introductionmentioning

confidence: 99%

Higher-order gap resonance between two identical fixed barges: A study on the effect of water depth

2022

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Nonlinear piston-mode fluid resonance in the gap formed by two identical fixed barges in close proximity is investigated using a two-dimensional (2D) fully nonlinear numerical wave tank (NWT). To delve into the effect of water depth on higher-order resonances in the gap, consistent models are employed to describe the incident waves and wave-structure interactions for finite and shallow water depths. In contrast to previous studies, strong 4th- and 5th-order nonlinear gap resonances are observed under the action of shallow-water waves, resulting in significant higher-harmonic responses that are comparable to the corresponding 1st and 2nd harmonics. For a given wave height, those waves are found to be more critical than the finite-depth waves which are capable of evoking 2nd- or 3rd-order gap resonance. Highly oscillatory behavior is observed at the trough under the action of shallow-water waves. This is ascribed to the higher-harmonic diffraction effects, breaking the `perfect cancellation' between the incident-wave harmonics which should otherwise produce smooth and flatter wave trough. Unlike what a linear diffraction theory will predict, the gap response does not behave completely in a quasi-static manner under long cnoidal waves, and the higher harmonics generally show larger phase differences to the corresponding incident-wave components until the resonance occurs. The present study suggests that the water-depth effect and higher harmonics should be consistently accounted for in the design and analysis of side-by-side marine operations in coastal environments involving piston-mode gap responses.

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An experimental and numerical study of the resonant flow between a hull and a wall

Cited by 12 publications

References 19 publications

Evaluating probabilistic forecasts for maritime engineering operations

Evaluating probabilistic forecasts for maritime engineering operations

Hysteresis phenomenon of the sloshing-mode resonance in a moonpool induced by rolling motion excitations

Higher-order gap resonance between two identical fixed barges: A study on the effect of water depth

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