Experimental investigation for characteristics of wave impact loads on a vertical cylinder in breaking waves

Ha, Yoon-Jin; Kim, Kyong‐Hwan; Nam, Bo Woo; Hong, Sa Young

doi:10.1016/j.oceaneng.2020.107470

Cited by 19 publications

(6 citation statements)

References 13 publications

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“…Ha et al. (2020) observed air entrapment for breaking wave impacts on a monopile. The pressure time histories of the test with air entrapment were highly oscillatory, with a maximum pressure magnitude significantly larger than that seen for the tests without air entrapment.…”

Section: Introductionmentioning

confidence: 99%

Wave front perturbation effect on the variability of monopile wave impact loads

Moalemi,

Bredmose,

Kristiansen

et al. 2024

J. Fluid Mech.

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The slamming wave force and pressure variabilities for monopile wave impacts are studied as functions of wave breaking shape and transverse perturbations on the breaking wave front. The impacting wave topology is characterized as slosh, flip-through, $\varOmega$ , overturning and fully broken. Fifty test repetitions are conducted for each type of wave impact to assess the variability of force impulse, force and pressure. The results for the unperturbed cases show that the slamming force is highest among the nominal slosh, flip-through and $\varOmega$ tests, and that the slamming force variability is highest for the first two. We demonstrate that the slamming force and pressure variabilities decrease notably after selecting and regrouping the tests by similar crest heights and temporal slopes measured at an upstream wave gauge. The group representing $\varOmega$ wave impacts shows the largest mean slamming force and peak pressure, and their variability is the highest among all groups. Further, the effect of lateral perturbations on the pressure, force and impulse variabilities is investigated. Due to the perturbations, the slamming pressure variability for the wave impacts in which the wave front hits the monopile surface increases significantly. The variability of the slamming force is also increased for the perturbed impacts; however, it is smaller than the slamming pressure variability. The force impulse variability shows a low sensitivity to perturbations, and its magnitude is smaller than that of the force variability. Finally, the slamming pressure using fifteen pressure sensors for five selected events is studied. For these tests, oscillations at frequencies associated with structural or bubble oscillations are seen. Further, the air entertainment is documented through video recordings.

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Section: Introductionmentioning

confidence: 99%

Wave front perturbation effect on the variability of monopile wave impact loads

Moalemi,

Bredmose,

Kristiansen

et al. 2024

J. Fluid Mech.

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show abstract

“…Wei (Wei et al, 2022) simulated the effect of wave impact pressure on the front bottom of the elevated box structure and used as the dataset to investigate the horizontal and vertical impact pressure distribution. Ha (Ha et al, 2020) studied the characteristics of wave impact loads and the effect of associated bubbles on vertical circular cylinders. Guo (Guo and Xiao, 2019) estimated the slamming impact loads of breaking waves on cylinders and showed the abnormal flow patterns and interactions between the breaking waves and the model cylinder.…”

Section: Introductionmentioning

confidence: 99%

Study on wave slamming characteristics of a typical floating wind turbine under freak waves

et al. 2023

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“…The OC6 Phase Ib campaign incorporated load measurements for each of the column/heave plate components of the semisubmersible seen in Figure 2, as well as pressure measurements on the heave plate and near the still waterline, where it is expected that the nonlinear hydrodynamic loading is the highest. Prior examples of pressure measurement in a wave basin with a surfacepiercing structure often focus on water impact problems during extreme wave events (see, e.g., [18][19][20][21][22]). In contrast, measurement of pressure on structures in nonbreaking and moderate waves is less common.…”

Section: Introductionmentioning

confidence: 99%

OC6 Phase Ib: Floating Wind Component Experiment for Difference-Frequency Hydrodynamic Load Validation

Robertson

Wang

2021

Energies

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A new validation campaign was conducted at the W2 Harold Alfond Ocean Engineering Laboratory at the University of Maine to investigate the hydrodynamic loading on floating offshore wind substructures, with a focus on the low-frequency contributions that tend to drive extreme and fatigue loading in semisubmersible designs. A component-level approach was taken to examine the hydrodynamic loads on individual parts of the semisubmersible in isolation and then in the presence of other members to assess the change in hydrodynamic loading. A variety of wave conditions were investigated, including bichromatic waves, to provide a direct assessment of difference-frequency wave loading. An assessment of the impact of wave uncertainty on the loading was performed, with the goal of enabling validation with this dataset of numerical models with different levels of fidelity. The dataset is openly available for public use and can be downloaded from the U.S. Department of Energy Data Archive and Portal.

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Experimental investigation for characteristics of wave impact loads on a vertical cylinder in breaking waves

Cited by 19 publications

References 13 publications

Wave front perturbation effect on the variability of monopile wave impact loads

Wave front perturbation effect on the variability of monopile wave impact loads

Study on wave slamming characteristics of a typical floating wind turbine under freak waves

OC6 Phase Ib: Floating Wind Component Experiment for Difference-Frequency Hydrodynamic Load Validation

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