Coupled vessel and moonpool responses in regular and irregular waves

Ravinthrakumar, Senthuran; Kristiansen, Trygve; Molin, Bernard; Ommani, Babak

doi:10.1016/j.apor.2019.102010

Cited by 30 publications

(4 citation statements)

References 9 publications

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“…It was demonstrated that the wave amplitude in the moonpool is mainly determined by the ratio of the moonpool length and width. Ravinthrakumar et al [21] carried out an experiment to study the effects of moonpool size on the hydrodynamic interaction between the floating body and the fluid in the moonpool. The experimental results were compared to linear numerical results, showing that the heave motion can be amplified by six times due to second-order wave resonant response in the moonpool.…”

Section: Introductionmentioning

confidence: 99%

Performance characteristics and parametric analysis of a novel multi-purpose platform combining a moonpool-type floating breakwater and an array of wave energy converters

et al. 2021

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Section: Introductionmentioning

confidence: 99%

Performance characteristics and parametric analysis of a novel multi-purpose platform combining a moonpool-type floating breakwater and an array of wave energy converters

et al. 2021

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“…Under excitation from an incident wave field, the free surface within a moonpool can oscillate at a resonant frequency, leading to internal elevations well more than the incident wave height [17]. Resonance can occur in various modes, including piston and sloshing types, both of which have been seen to have some influence on the heave and pitch motions of structures with moonpools [18].…”

Section: Introductionmentioning

confidence: 99%

Mooring Analysis of a Floating OWC Wave Energy Converter

Pols

Gubesch

Abdussamie

et al. 2021

JMSE

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This investigation focuses on the modelling of a floating oscillating water column (FOWC) wave energy converter with a numerical code (ANSYS AQWA) based on potential flow theory. Free-floating motions predicted by the numerical model were validated against experimental data extrapolated from a 1:36 scale model device in regular and irregular sea states. Upon validation, an assessment of the device’s motions when dynamically coupled with a four-line catenary mooring arrangement was conducted at different incident wave angles and sea states ranging from operational to survivable conditions, including the simulation of the failure of a single mooring line. The lack of viscosity in the numerical modelling led to overpredicted motions in the vicinity of the resonant frequencies; however, the addition of an external linear damping coefficient was shown to be an acceptable method of mitigating these discrepancies. The incident wave angle was found to have a limited influence on the magnitudes of heave, pitch, and surge motions. Furthermore, the obtained results indicated that the mooring restoring force is controlled by the forward mooring lines under the tested conditions.

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“…However, the fluid motion in the moonpool causes additional resistance, structural adverse motion, and so on in resonance cases under resonance conditions. 9–14…”

Section: Introductionmentioning

confidence: 99%

“…However, the fluid motion in the moonpool causes additional resistance, structural adverse motion, and so on in resonance cases under resonance conditions. [9][10][11][12][13][14] Waves break under the action of the wind, ship motion, and jet. Air is sucked into the water, and bubbles form.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of bubble formation and motion mechanism near the moonpool

Yao

Huang

Shi

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part M:

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When a research ship sails at a high speed, there is relative motion between the ship and fluid. The ship is slammed by the fluid. To reduce the direct impact of the fluid, sonar is installed in the moonpool, and acoustic detection equipment is installed along the research ship bottom behind the moonpool. However, during high-speed sailing, a large number of bubbles form in the moonpool. Some bubbles escape from the moonpool and flow backward along the bottom of the ship. When a large number of bubbles are around the sonar and acoustic detection equipment, the equipment malfunctions. However, there have been few studies on bubble formation in the moonpool with sonar and distribution along the ship bottom behind the moonpool. Therefore, a related model was developed and prototype tests were carried out in this study. The appropriate similarity criteria were selected and verified to ensure the reliability of the experiment. Considering the influences of speed, sonar, moonpool shape, and draft, the reason and mechanism of bubble formation in a sonar moonpool were studied. An artificial ventilation method was used to simulate a real navigation environment. Because the bubbles are in a bright state under laser irradiation, the bubbles can be used as tracer particles. A high-speed camera captured illuminated bubbles. The distribution mechanism of bubbles along the ship bottom behind the moonpool was investigated using particle image velocimetry under the influence of the moonpool shape and sailing speed. The model experimental results agreed well with those of the prototype test. The air sucked into the water was the dominant factor in bubble formation in the moonpool. The bubbles were distributed in a W shape under the ship bottom.

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Coupled vessel and moonpool responses in regular and irregular waves

Cited by 30 publications

References 9 publications

Performance characteristics and parametric analysis of a novel multi-purpose platform combining a moonpool-type floating breakwater and an array of wave energy converters

Performance characteristics and parametric analysis of a novel multi-purpose platform combining a moonpool-type floating breakwater and an array of wave energy converters

Mooring Analysis of a Floating OWC Wave Energy Converter

Experimental investigation of bubble formation and motion mechanism near the moonpool

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