Mathematical Modelling of Mooring Systems for Wave Energy Converters—A Review

Davidson, Josh; Ringwood, John V.

doi:10.3390/en10050666

Cited by 106 publications

(50 citation statements)

References 157 publications

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“…Vicente et al (2010) modeled the mooring cables as catenary lines in a quasi-static analysis, and a finite element cable model was used by Bailey et al (2015) to study arrays of different WECs with a stochastic method, focusing on power variations. For a comprehensive review of modeling methods for WEC mooring systems, see Davidson and Ringwood (2017). In section 4.1, we will return to the numerical models of WEC arrays and discuss how well they represent the physical systems studied.…”

Section: Motion and Pto Modelingmentioning

confidence: 99%

Advances and Challenges in Wave Energy Park Optimization—A Review

et al. 2020

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A commercial wave energy system will typically consist of many interacting wave energy converters installed in a park. The performance of the park depends on many parameters such as array layout and number of devices, and may be evaluated based on different measures such as energy absorption, electricity quality, or cost of the produced electricity. As wave energy is currently at the stage where several large-scale installations are being planned, optimizing the park performance is an active research area, with many important contributions in the past few years. Here, this research is reviewed, with a focus on identifying the current state of the art, analyzing how realistic, reliable, and relevant the methods and the results are, and outlining directions for future research.

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Section: Motion and Pto Modelingmentioning

confidence: 99%

Advances and Challenges in Wave Energy Park Optimization—A Review

et al. 2020

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“…However, the WECs are equipped with umbilicals, which puts a limit on the allowable excursion, because tensions in these must be prohibited [27]. The design of the umbilical is, therefore, often a part of the mooring design and a compromise between the cost of umbilical and mooring.…”

Section: Design Criteriamentioning

confidence: 99%

“…In some applications (cf., e.g., [11]), configurations with three lines are considered. In this study, however, this number is considered insufficient in order to increase durability and redundancy, which is considered a vital parameter for a mooring system [27]. This is mainly a problem in the ALS, but must be taken into account early in the process.…”

Section: Optimization Parametersmentioning

confidence: 99%

“…A number of tools was investigated in the project (cf. [14]) and has also been listed in other publications like [27]. A selected software package was validated against the experimental data in order to gain knowledge about the applicability of the tools on initial design, and the software proved its ability to model line tensions with acceptable overestimation of the tension without major tuning of the numerical model.…”

Section: Introductionmentioning

confidence: 99%

“…As presented in [13,27,28], the mooring characteristics are highly dependent on the site specification, mooring layout, materials, etc., and the response is, therefore, highly affected by the choices. The mooring design procedure is iterative, and it can be extremely time consuming to cover the full design space in order to find a solution that fulfils all defined requirements and, at the same time, provides a low cost.…”

Section: Introductionmentioning

confidence: 99%

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Cost Optimization of Mooring Solutions for Large Floating Wave Energy Converters

et al. 2018

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Abstract:The increasing desire for using renewable energy sources throughout the world has resulted in a considerable amount of research into and development of concepts for wave energy converters. By now, many different concepts exist, but still, the wave energy sector is not at a stage that is considered commercial yet, primarily due to the relatively high cost of energy. A considerable amount of the wave energy converters are floating structures, which consequently need mooring systems in order to ensure station keeping. Despite being a well-known concept, mooring in wave energy application has proven to be expensive and has a high rate of failure. Therefore, there is a need for further improvement, investigation into new concepts and sophistication of design procedures. This study uses four Danish wave energy converters, all considered as large floating structures, to investigate a methodology in order to find an inexpensive and reliable mooring solution for each device. The study uses a surrogate-based optimization routine in order to find a feasible solution in only a limited number of evaluations and a constructed cost database for determination of the mooring cost. Based on the outcome, the mooring parameters influencing the cost are identified and the optimum solution determined.

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Accurate modeling of the interaction of constrained floating structures and complex free surfaces using a new quasistatic mooring model

Martín

Kamath

Bihs

2020

Numerical Methods in Fluids

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SummaryA new approach for the coupled simulation of moored floating structures in a numerical wave tank using CFD is subject of this article. A quasistatic mooring model is derived by dividing the cable into finite elements and solve force equilibria in each time step. A successive approximation is applied to solve the problem most efficiently. Here, the unknown internal and external forces are separated, and the system is corrected iteratively using the intermediate results for the unit vectors until convergence is reached. An improved algorithm based on the directional ghost‐cell immersed boundary method is utilized for modeling floating objects in a three‐dimensional numerical wave tank. It is based on an implicit representation of the body on a stationary grid using a level set function. The motion of the rigid body is described using Euler parameters and Hamiltonian mechanics. Dynamic boundary conditions are enforced by modifying the ghost points in the vicinity of the structure. A special procedure for staggered grids is included in the article. The mooring model is coupled to the fluid‐structure interaction solver to simulate physically constrained floating bodies in waves. Several validation cases provide an overview of the accuracy of the mooring model and the floating algorithm. In addition, the comparison of the numerical results for the motion of a moored floating barge in regular waves with experiments is presented.

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Mathematical Modelling of Mooring Systems for Wave Energy Converters—A Review

Cited by 106 publications

References 157 publications

Advances and Challenges in Wave Energy Park Optimization—A Review

Advances and Challenges in Wave Energy Park Optimization—A Review

Cost Optimization of Mooring Solutions for Large Floating Wave Energy Converters

Accurate modeling of the interaction of constrained floating structures and complex free surfaces using a new quasistatic mooring model

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