The Numerical Modeling of Coupled Motions of a Moored Floating Body in Waves

Cheng, Lin; Lin, Ping

doi:10.3390/w10121748

Cited by 8 publications

(6 citation statements)

References 23 publications

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“…In general, water filled structures can be found in a wide range of applications including Wave Energy Converters (WEC) [3][4][5], Oscillating Water Columns (OWC) [6,7], and energy storage concepts [8,9]. The correct prediction of the motion and forces acting on a floating body are essential for the structural and mooring designs [10,11]. The response of Very Large Floating Structures (VLFS) [12][13][14], including the inner water level [15], have only been investigated for small motions.…”

Section: Introductionmentioning

confidence: 99%

Comparison of a Floating Cylinder with Solid and Water Ballast

Gabl

Davey

Nixon

et al. 2019

Water

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Modelling and understanding the motion of water filled floating objects is important for a wide range of applications including the behaviour of ships and floating platforms. Previous studies either investigated only small movements or applied a very specific (ship) geometry. The presented experiments are conducted using the simplified geometry of an open topped hollow cylinder ballasted to different displacements. Regular waves are used to excite the floating structure, which exhibits rotation angles of over 20 degrees and a heave motion double that of the wave amplitude. Four different drafts are investigated, each with two different ballast options: with (water) and without (solid) a free surface. The comparison shows a small difference in the body’s three translational motions as well as the rotation around the normal axis to the water surface. Significant differences are observed in the rotation about the wave direction comparable to parametric rolling as seen in ships. The three bigger drafts with free surface switch the dominant global rotation direction from pitch to roll, which can clearly be attributed to the sloshing of the internal water. The presented study provides a new dataset and comparison of varying ballast types on device motions, which may be used for future validation experiments.

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Section: Introductionmentioning

confidence: 99%

Comparison of a Floating Cylinder with Solid and Water Ballast

Gabl

Davey

Nixon

et al. 2019

Water

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“…Based on the position of the centre of gravity of the FB, different mooring line states (cases a, b, c, d) were considered (Figure 3). The horizontal (F xm ) and vertical (F ym ) mooring forces acting on the FB were calculated for different states as per Cheng and Lin (2018):…”

Section: Mooring Line Dynamicsmentioning

confidence: 99%

“…For the validation of the mooring model, the experimental results by Cheng and Lin (2018) corresponding to the case of a floating box of 0.3 m length, 0.18 m height and 750 kg/m 3 density positioned at 3.35 m downstream a wave maker were used to validate the approach. In this model, each mooring line had vertical and horizontal (parameter S in Figure 1) lengths of 0.91 and 0.79 m, respectively.…”

Section: Validation Of the Wave-body Interaction Modellingmentioning

confidence: 99%

A machine learning method for the evaluation of hydrodynamic performance of floating breakwaters in waves

Saghi

Mikkola

Hirdaris

2021

Ships and Offshore Structures

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This paper presents a two-dimensional simulation model for the idealisation of moored rectangular and trapezoidal floating breakwaters (FB) motions in regular and irregular waves. Fast-Fictitious Domain and Volume of Fluid methods are coupled to track-free surface effects and predict FB motions. Hydrodynamic performance is assessed by a machine learning method based on Cuckoo Search-Least Square Support Vector Machine model (CS-LSSVM). Results confirm that a suitable combination of the aspect ratio of an FB and her sidewall mooring angle could help attenuate incoming waves to a minimum height. It is concluded that moored trapezoidal FBs are more efficient than traditional rectangular designs and subject to further validation CS-LSSVM can be useful in terms of optimising the values of predicted wave transmission coefficients.

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“…The results illustrated that a rectangular enclosure with a small curve in the corner could absorb more wave energy. Cheng and Lin (2018) used the virtual boundary force (VBF) technique to study the interaction between water waves and a moored floating body. They simulated the movements of a free-floating box in two dissimilar water waves for validation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Interactions between Solitary Waves and Floating Breakwaters

Malazi

Dalkılıç

2022

JAFM

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In the current numerical work, a 2D wave tank has been planned to explain the shared impacts among three different solitary waves and three different floating breakwaters by applying Reynolds-Averaged Navier-Stokes models and the volume of fluid method. Three dissimilar floating breakwaters (i.e., square breakwater, circular breakwater, and modified breakwater) were chosen. A total of eighteen cases were investigated, including three different floating breakwaters, a solitary wave (SW) with three different wave heights, and two different densities of floating breakwaters. We achieved the production of a solitary wave by moving a wave paddle (WP) and the motion of floating breakwater in two various directions by applying two different codes as userdefined functions. The dynamic mesh technique has been employed for re-forming mesh during the motion of the wave paddle and the floating breakwater. The numerical calculations have been confirmed by some numerical, analytical, and experimental case studies. First, the generation of a SW using the WP movement and the free motion of a heaving round cylinder on the free surface of motionless water were modeled and validated. Additionally, the effects of various parameters, including floating breakwater shape, floating breakwater density, and solitary wave height, on the hydrodynamic performances of the floating breakwater, the floating breakwater's motions, and the free-surface elevation were considered under various conditions.

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The Numerical Modeling of Coupled Motions of a Moored Floating Body in Waves

Cited by 8 publications

References 23 publications

Comparison of a Floating Cylinder with Solid and Water Ballast

Comparison of a Floating Cylinder with Solid and Water Ballast

A machine learning method for the evaluation of hydrodynamic performance of floating breakwaters in waves

Numerical Modeling of Interactions between Solitary Waves and Floating Breakwaters

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