Ships and Sea Structures with a Hydrodynamic Perspective

FALTINSEN, Odd Magnus

doi:10.14744/seatific.2022.0002

Cited by 3 publications

(4 citation statements)

References 37 publications

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“…Morison elements are employed based on the cross‐flow principle (see, for example, Faltinsen, 1990). The application of loads to membrane elements follows a similar approach to Morison, which is also used for cables with a lift component.…”

Section: Methodsmentioning

confidence: 99%

“…No. 1821 (2020), where the highest wave of low probability, expressed as Hmax = 1.9Hs in Norway and Hmax = 1.86 in Chile, is applied.

φ_{I} = \frac{g * ζ_{a}}{w_{0}} * \cos (w * t - k * x * \cos β - ky \sin β)

where

φ_{I}

is the wave potential as a result of incident waves (e.g., Faltinsen, 1990), g is the acceleration as a result of gravity,

ζ_{a}

is the wave elevation amplitude, w 0 is the wave frequency, k is the wave number and

β

is the wave heading relative to global x‐axis.…”

Section: Methodsmentioning

confidence: 99%

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Structural integrity of a submersible sea cage exposed to extreme oceanographic conditions

López,

Hurtado,

Toledo

et al. 2024

J World Aquaculture Soc

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This study focuses on the structural integrity analyses of a submersible cage with dimensions of 20 m in diameter and 10 m depth under extreme oceanographic conditions, including current speed of 0.5 and 1 m/s, combined with waves ranging from 2 to 5 m in height and a period of 7 s. Employing a dynamic simulation model based on finite elements, The study examines the stresses in the cage´s pipes, as well as the tension in the bridle lines and mooring lines. Results indicate that submerging the cage leads to a reduction in peak tensions, with mooring lines experiencing a decrease of up to 32% and bridle lines experiencing a decrease of up to 59%. Furthermore, the stresses in the pipes exhibit a significant decline of up to 71.4%. These findings demonstrate that the submersible cage, when submerged, significantly reduces peak stresses, thereby decreasing the risk of structural loss or damage when the system is submerged.

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Section: Methodsmentioning

confidence: 99%

“…No. 1821 (2020), where the highest wave of low probability, expressed as Hmax = 1.9Hs in Norway and Hmax = 1.86 in Chile, is applied.

φ_{I} = \frac{g * ζ_{a}}{w_{0}} * \cos (w * t - k * x * \cos β - ky \sin β)

where

φ_{I}

is the wave potential as a result of incident waves (e.g., Faltinsen, 1990), g is the acceleration as a result of gravity,

ζ_{a}

is the wave elevation amplitude, w 0 is the wave frequency, k is the wave number and

β

is the wave heading relative to global x‐axis.…”

Section: Methodsmentioning

confidence: 99%

Structural integrity of a submersible sea cage exposed to extreme oceanographic conditions

López,

Hurtado,

Toledo

et al. 2024

J World Aquaculture Soc

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“…In the model, the installation vessel and the spar foundation are represented as two rigid bodies that are interconnected through mechanical and hydrodynamic couplings at their interfaces. Both bodies experience wave-induced forces, hydrodynamic reaction forces, and mechanical coupling effects [36][37][38].…”

Section: Numerical Modelmentioning

confidence: 99%

Dynamic Analysis of a Novel Installation Method of Floating Spar Wind Turbines

Hassan

Soares

2023

JMSE

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This paper presents the performance of a new, floating, mono-hull wind turbine installation vessel (Nordic Wind) in the installation process. The vessel can transport pre-assembled wind turbines from the marshalling port to the offshore installation site. Each assembled turbine will be positioned over the pre-installed floating spar structure. The primary difficulty lies in examining the multibody system’s reactions when subjected to combined wind, current, and wave forces. Time-domain simulations are utilized to model the interconnected system, incorporating mechanical coupling between components, the mooring system for the spar, and the installation vessel. The primary objective is to focus on the monitoring and connection stages preceding the mating operations between the turbine and the floating spar. Additionally, it involves examining the impacts of wind, current, and wave conditions on the motion responses of the installation vessel and the spar, as well as the relative motions at the mating point, gripper forces, and mooring forces. The simulations show that the resulting gripper forces are reasonable to compensate. The relative motion at the mating point is not significantly affected by the orientations of the turbine blades, but it is influenced by the prevailing wave conditions. In addition, vessel heading optimization can minimize the relative motions at the mating point and gripper forces. Given the examined environmental conditions, the presented installation concept exhibits a commendable performance.

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“…The stresses on the mooring line can be divided into a) Mean tension, the tension Figure 9 Confi guration of mooring lines with a taut system on a fl oating breakwater Slika 9. Konfi guracija užadi za privezivanje sustavom napinjanja na plutajućemu lukobranu According to Faltinsen [57], the calculation of the maximum tension of the mooring rope can use the equation below:…”

Section: Mooring Line System / Sustav Užadi Za Privezivanjementioning

confidence: 99%

Numerical Modeling of Hydrodynamic Performance on Porous Slope Type Floating Breakwater

Sujantoko,

Djatmiko,

Wardhana

et al. 2023

Naše more

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A breakwater is a coastal building that aims to break up or withstand wave energy that enters the beach so that the characteristics of the incoming waves are by calculations and can reduce abrasion on the shoreline. Designing a floating breakwater is very complicated because it depends on many aspects. These fundamental aspects depend on each other, so if one of these aspects changes, the integrity of the floating breakwater structure will also change. One of these aspects is the magnitude of the transmission and reflection coefficients generated by the floating breakwater. This research will study the hydrodynamic performance of floating breakwater due to variations in slope and porosity in reducing and reflecting waves with computational fluid dynamics (CFD). The slope-porous floating breakwater dimension is based on previous experimental data, including a constant water depth of 0.75 m, a wave height of 0.05 - 0.125 m, and a wave period of 1.1 - 2 sec on regular waves. The results of the numerical model validation and experiments on all variations of the floating breakwater model are quite good, which is less than 10% for both wave transmission and reflection. Analysis of the influence of changes in the mooring line angle, the simulation is carried out at an angle of 30 deg to 90 deg and produces an average transmission coefficient of 0.79 and a reflection of 0.21. While the effect of changes in water level elevation (0.85 m, 0.75 m, and 0.65 m) gives a reasonably significant average transmission coefficient of 0.85 and a reflection of 0.13. The mooring line angle will be gentler at high tide, and the transmission and reflection coefficients will be higher. However, the mooring line will loosen at low tide, causing the structure to move more freely and eliminating the function of the floating breakwater itself so that the tidal phenomenon becomes a challenge for coastal experts in designing structures to produce effective and efficient hydrodynamic performance.

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Ships and Sea Structures with a Hydrodynamic Perspective

Cited by 3 publications

References 37 publications

Structural integrity of a submersible sea cage exposed to extreme oceanographic conditions

Structural integrity of a submersible sea cage exposed to extreme oceanographic conditions

Dynamic Analysis of a Novel Installation Method of Floating Spar Wind Turbines

Numerical Modeling of Hydrodynamic Performance on Porous Slope Type Floating Breakwater

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