Influence of Wave Induced Second-Order Forces in Semi-Submersible FOWT Mooring Design

López-Pavón, Carlos; Watai, Rafael A.; Ruggeri, Felipe; Simos, Alexandre N.; Souto-Iglesias, Antonio

doi:10.1115/omae2013-10459

Cited by 5 publications

(5 citation statements)

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“…For subsequent design phases (e.g. mooring design), a complete model of the platform was built and tested (Lopez-Pavon et al, 2013). The shape of the disc edge is rectangular.…”

Section: Modelmentioning

confidence: 99%

Hydrodynamic forces on heave plates for offshore systems oscillating close to the seabed or the free surface

Mendoza¹

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xiv de la distancia al fondo marino o a la superficie libre.3. El comportamiento físico del flujo, para valores de KC cercanos a su valor crítico ha sido estudiado mediante el análisis del campo de vorticidad.4. Introducir porosidad al disco, reduce la masa añadida para los valores de KC estudiados, pero se ha encontrado que la porosidad incrementa el valor del coeficiente de amortiguamiento cuando se incrementa la amplitud del movimiento, logrando un máximo de damping para un disco con 10% de porosidad.5. Los resultados numéricos y experimentales para los discos con faldón, muestran que usar este tipo de geometrías incrementa la masa añadida cuando se compara con el disco sólido, pero reduce considerablemente el coeficiente de amortiguamiento.6. Un diseño novedoso de heave plate basado en la teoría fractal ha sido experimentalmente estudiado a diferentes calados y comparado con datos experimentales obtenidos por otro autores. Los resultados muestran un comportamiento incierto de los coeficientes y por tanto este diseño debería ser estudiado más a fondo.xv

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“…For subsequent design phases (e.g. mooring design), a complete model of the platform was built and tested (Lopez-Pavon et al, 2013). The shape of the disc edge is rectangular.…”

Section: Modelmentioning

confidence: 99%

Hydrodynamic forces on heave plates for offshore systems oscillating close to the seabed or the free surface

Mendoza¹

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“…For subsequent design phases (e.g. mooring design), a complete model of the platform was built and tested [24].…”

Section: Modelmentioning

confidence: 99%

Hydrodynamic coefficients and pressure loads on heave plates for semi-submersible floating offshore wind turbines: A comparative analysis using large scale models

López-Pavón

Souto-Iglesias²

2015

Renewable Energy

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a b s t r a c tHydrodynamic forces on heave plates for a semi-submersible floating offshore wind turbine are discussed herein. A model of one of the platform columns has been built. This allows for the fitting of either a plain solid plate or the real heave plate prototype design. The latter is equipped with a vertical flap at its edge. The influence of the flap on the hydrodynamic coefficients is investigated through a results comparison with the plain solid one. The model plate diameter is 1 m, thus becoming, to the authors' knowledge, the largest for which results have been published. Results from experiments, in which added mass and damping coefficients have been measured, are presented. This experimental campaign also comprised the direct measurement of dynamic pressures on both heave plates, a fundamental magnitude for the structural design, which, until now, had not been experimentally explored for this type of system. For comparative reasons, numerical simulations were also conducted following common industry standards, both with a wide-spread frequency domain panel method (WADAM) and a RANS CFD commercial code (ANSYS CFX). Finally, results are compared with literature and consistent non-dimensionalizations are sought, with the aim of making these results useful for preliminary design purposes. The authors believe this research could benefit the offshore wind industry by improving the hydrodynamic design of the concept.

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“…For mooring systems used in WECs, where highly compliant behaviour is needed, Ridge et al (2010) investigated the option of using nylon fibre rope moorings. However, many mooring system designs and analyses are still conducted on moorings made of metallic materials (Abouelfadl et al, 2013;Christiansen et al, 2013;López-Pavón et al, 2013;Murphy et al, 2015;Soulard et al, 2013).…”

Section: Mooring Fatigue and Objective Of The Studymentioning

confidence: 99%

A comparison of coupled and de-coupled simulation procedures for the fatigue analysis of wave energy converter mooring lines

et al. 2016

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Newcastle University ePrints -eprint.ncl.ac.uk Yang S, Ringsberg JW, Johnson E, Hu ZQ. A comparison of coupled and decoupled simulation procedures for the fatigue analysis of wave energy converter mooring lines. Ocean Engineering 2016, 117, 332-345. AbstractMooring systems for floating wave energy converters (WECs) must be designed to survive the cyclical loads and motions to which they are subjected as a result of the wave load-WEC interaction and the motions of the WEC in the random elevation of the sea surface. The current study compares simulation procedures for the fatigue analysis of WEC moorings. The objective is to suggest a simulation procedure suitable for an extensive study of the behaviour of WEC systems and thus for the fatigue analysis of mooring lines. A cylindrical, floating WEC with four spread mooring lines is chosen as case study. The dynamics of the WEC system are simulated and analysed using both coupled and de-coupled models in the timedomain. Four types of simulation procedures are compared using commercial software, DNV DeepC, and an in-house solver, MooDy. A systematic fatigue response analysis based on variations of the numerical and physical parameters is conducted. The results are compared with respect to the fatigue damage calculated using the stress-based approach and the rainflow counting method. The simulation procedure using a coupled model is suggested as the preferred numerical method for capturing the interaction between the components of WEC system, which is proven to be crucial for the fatigue damage evaluation of mooring lines.

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Influence of Wave Induced Second-Order Forces in Semi-Submersible FOWT Mooring Design

Cited by 5 publications

References 3 publications

Hydrodynamic forces on heave plates for offshore systems oscillating close to the seabed or the free surface

Hydrodynamic forces on heave plates for offshore systems oscillating close to the seabed or the free surface

Hydrodynamic coefficients and pressure loads on heave plates for semi-submersible floating offshore wind turbines: A comparative analysis using large scale models

A comparison of coupled and de-coupled simulation procedures for the fatigue analysis of wave energy converter mooring lines

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