Numerical modeling of dynamic responses and mooring forces of submerged floating breakwater

Rahman, Md. Ataur; Mizutani, Norimi; Kawasaki, Koji

doi:10.1016/j.coastaleng.2006.04.001

Cited by 99 publications

(31 citation statements)

References 9 publications

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“…Results showed that the wave reflection properties of the structure depend strongly on the draft and spacing of the pontoons and the mooring line stiffness. A two-dimensional numerical estimation method of calculating dynamics of a pontoon type submerged floating breakwater and the forces acting on its mooring lines due to the wave action were investigated (Rahman et al, 2006). The comparison between the numerical and the experimental results confirmed the validity of the numerical model and the good performance on wave energy dissipation.…”

Section: Introductionmentioning

confidence: 80%

Experimental study of a new type of floating breakwater

Chen

Cui

et al. 2015

Ocean Engineering

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A new type of floating breakwater (FB) is proposed in this paper. Its hydrodynamic performance has been tested. The structure of the new breakwater named cylindrical floating breakwater (CFB) consists of two parts: a main body of rigid cylinders, and a flexible mesh cage containing a number of suspending balls that are intended to absorb the wave energy into their mechanical energy. A series of experiments were carried out on the new floating breakwater and traditional double pontoons and box floating breakwaters to compare their performances. A two-dimensional wave flume was used in the experiment; the incident and transmitted waves, the tensions on the mooring lines and the motion responses of the floating breakwaters were measured. Results showed that the new floating breakwater had a better performance than the traditional double pontoons and the box floating breakwaters: wave transmission was significantly reduced by the mesh cage with the balls, especially for long waves

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Section: Introductionmentioning

confidence: 80%

Experimental study of a new type of floating breakwater

Chen

Cui

et al. 2015

Ocean Engineering

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“…In their model, a coupled virtual boundary force with the volume of the fluid method was proposed to simulate wave interaction with internal structures. Rahman et al [12] developed a two-dimensional numerical model, which combines the VOF model and porous body model, to investigate the dynamic responses of a submerged breakwater moored by inclined tension legs under wave action. Peng et al [13] studied the interactions between water waves and inclined-moored floating breakwater using a viscous flow model.…”

Section: Introductionmentioning

confidence: 99%

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

Cheng

Lin

2018

Water

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Nonlinear interactions between water waves and a moored floating body are investigated using the virtual boundary force (VBF) method. The paper first introduces an in-house three-dimensional viscous incompressible flow model (NEWTANK), which is used to simulate wave-floating structure interaction by using the VBF method. Then the coupling procedure between the mooring line model and the floater model is described. Some validation cases of the developed model, including the motions of a free-floating box in two different water waves, are presented. The present numerical results will be compared with the available experimental data and other numerical results from the published literature. After that, the validity of the mooring line in the numerical model is simulated by simulating the motions of a floating box in still water. Finally, the verified model is applied to analyze the wave-induced motions of a catenary moored floating structure, investigating the motion responses and mooring forces responses. The numerical results agree well with the experimental measurements on the whole. This indicates that the present numerical model can correctly capture the main features of the wave-moored floating structure interaction.

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“…In such cases, the potential flow theory is not valid and other tools based on Computational Fluid Dynamics (CFD) solvers to resolve the full Navier-Stokes equations or Lattice Boltzmann method (LBM) have been used [35][36][37][38][39][40]. Most of these problems have been formulated in 2D, and despite the increase of computational power, the full 3D models require a considerable computational cost.…”

Section: Introductionmentioning

confidence: 99%

A 3d Isogeometrical Boundary Element Analysis for Non-Linear Gravity Wave Propagation

Maestre¹,

Pallarès²,

Cuesta³

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Abstract. In this paper we describe a three-dimensional Isogeometric BEM in the time domain based on the T-spline and Non Uniform Rational B-Splines (NURBS) basis to study the free surface behavior. Traditionally, the Lagrange polynomials have been used to discretize the geometry and the BEMs variables. The Lagrange basis are discontinues across the elements although the physical variables are continuous. In dynamics problems with high mesh distortions this approach can produce numerical instabilities that can be quickly propagated. This problem could be overcome using T-spline or NURB basis. The main advantages of this approach are: (1) the control of the continuity and smoothness of the T-spline and NURBS basis, which makes the model numerically stable without the need of artificial smooth techniques;(2) the high order geometrical approximation by non-rational splines;(3) the refinement capabilities without affecting the geometry and BEM's variables; and (4) the direct integration with computer aid geometrical design tools. We use the concept of the Bézier extraction operation which provides an element point of view of the T-Spline and NURBS similar to the traditional finite element. The boundary integral Equation is solved at each time step by the GMRES algorithm and the time marching scheme is performed with a fourth-order Runge-Kutta method to update the model. Additionally, the hydrodynamic force is calculated by an auxiliary boundary equation. Some numerical benchmark examples are analysed to show the accuracy and the stability of the method 7967 J. Maestre, J. Pallarés and I. Cuesta

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Numerical modeling of dynamic responses and mooring forces of submerged floating breakwater

Cited by 99 publications

References 9 publications

Experimental study of a new type of floating breakwater

Experimental study of a new type of floating breakwater

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

A 3d Isogeometrical Boundary Element Analysis for Non-Linear Gravity Wave Propagation

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