Dynamic response and power performance of a combined Spar-type floating wind turbine and coaxial floating wave energy converter

Muliawan, Made Jaya; Karimirad, Madjid; Moan, Torgeir

doi:10.1016/j.renene.2012.05.025

Cited by 159 publications

(92 citation statements)

References 7 publications

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“…There are many synergies that could be exploitable to overcome some of the barriers that marine energies could present to entry into the market. First of all, important cost savings could be achieved during the setup of the energy farms because of common elements and coordinated strategies [54,[91][92][93]. The largest savings would be achieved in the electrical connection, since the offshore station and the export cable can be the same for both installations.…”

Section: Co-located Wind and Wave Energy Farmsmentioning

confidence: 99%

“…The largest savings would be achieved in the electrical connection, since the offshore station and the export cable can be the same for both installations. When hybrid technology was developed, important cost reductions in the substructure foundation system would be achieved as hybrid wave converter systems share the same substructure or foundation with the offshore wind turbine [89,91]. Moreover, the cost of O & M tasks can be reduced in co-located farms since the scheduled maintenance of wave and wind energy can be organised to be done at the same time or in continuous length of time [53].…”

Section: Co-located Wind and Wave Energy Farmsmentioning

confidence: 99%

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Enhancing Wave Energy Competitiveness through Co-Located Wind and Wave Energy Farms. A Review on the Shadow Effect

Astariz

Iglesias

2015

Energies

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Abstract:Wave energy is one of the most promising alternatives to fossil fuels due to the enormous available resource; however, its development may be slowed as it is often regarded as uneconomical. The largest cost reductions are expected to be obtained through economies of scale and technological progress. In this sense, the incorporation of wave energy systems into offshore wind energy farms is an opportunity to foster the development of wave energy. The synergies between both renewables can be realised through these co-located energy farms and, thus, some challenges of offshore wind energy can be met. Among them, this paper focuses on the longer non-operational periods of offshore wind turbines-relative to their onshore counterparts-typically caused by delays in maintenance due to the harsh marine conditions. Co-located wave energy converters would act as a barrier extracting energy from the waves and resulting in a shielding effect over the wind farm. On this basis, the aim of this paper is to analyse wave energy economics in a holistic way, as well as the synergies between wave and offshore wind energy, focusing on the shadow effect and the associated increase in the accessibility to the wind turbines.

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Section: Co-located Wind and Wave Energy Farmsmentioning

confidence: 99%

Section: Co-located Wind and Wave Energy Farmsmentioning

confidence: 99%

Enhancing Wave Energy Competitiveness through Co-Located Wind and Wave Energy Farms. A Review on the Shadow Effect

Astariz

Iglesias

2015

Energies

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“…It is understood that proper generation of the inlet boundary conditions for CFD simulations, especially for LES in computational wind engineering (CWE), is essential in the analyses of wind pressure distributions and the dynamic responses of prototype structures [14]. Therefore, the improvement of simulating fluctuating wind speed in the inlet boundary is provided in the present study.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Fluctuating Wind Effects on an Offshore Deck Structure

Zhou

Han

et al. 2017

Shock and Vibration

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The offshore structures that play a vital role in oil and gas extraction are always under complicated environmental conditions such as the random wind loads. The structural dynamic response under the harsh wind is still an important issue for the safety and reliable design of offshore structures. This study conducts an investigation to analyze the wind-induced structural response of a typical offshore deck structure. An accurate and efficient mixture simulation method is developed to simulate the fluctuating wind speed, which is then introduced as the boundary condition into numerical wind tunnel tests. Large eddy simulation (LES) is utilized to obtain the time series of wind pressures on the structural surfaces and to determine the worst working condition. Finally, the wind-induced structural responses are calculated by ANSYS Parametric Design Language (APDL). The numerically predicted wind pressures are found to be consistent with the existing experimental data, demonstrating the feasibility of the proposed methods. The wind-induced displacements have the certain periodicity and change steadily. The stresses at the top of the derrick and connections between deck and derrick are relatively larger. These methods as well as the numerical examples are expected to provide references for the wind-resistant design of the offshore structures.

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“…One of them, the spar-buoy floating wind turbine, incorporates a long vertical tube (typically 150 m long) submerged below the turbine's tower that deepens the centre of buoyancy and stabilizes the turbine structure (Roddier andWeinstein 2010, Viré 2012). It seems possible to combine a spar-buoy floating wind turbine with a wave energy converter, with the shape of a torus attached at the basis of the turbine's tower so that wind and wave energy are simultaneously obtained at the same location (Muliawan et al 2013). The idea that we explore in this work is to use the power of a spar-buoy turbine to raise deep water through an extended spar converted into a long (say 300 m deep) hollow tube (Fig.…”

Section: Introductionmentioning

confidence: 99%

Artificial upwelling using offshore wind energy for mariculture applications

Viúdez¹,

Balsells²,

Rodríguez-Marroyo³

2016

Sci. Mar.

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Summary: Offshore wind is proposed as an energy source to upwell nutrient-rich deep water to the ocean photic layers. A spar-buoy wind turbine with a rigid tube about 300 m long is proposed as a pipe to drive deep water up to the surface. The minimum energy required to uplift the water is the potential energy difference between surface waters inside and outside the pipe, which depends on the background density profile. The corresponding surface jump or hydraulic head, h, calculated for several analytical and experimental density profiles, is of the order of 10 cm. If the complete turbine power (of the order of several MW) is used for raising the water (assuming a 100% pump efficiency), in a frictionless flow, very large water volumes, of the order of thousands of m 3 s −1 , will be transported to the photic layers. In a more realistic case, taking into account pipe friction in wide pipes, of the order of 10 m radius, and a power delivered to the fluid of 1 MW, the volume transport is still very large, about 500 m 3 s −1 . However, such a large amount of dense water could sink fast to aphotic layers due to vertical static instability (the fountain effect), ruining the enhancement of primary production. Hence, some ways to increase the turbulent entrainment and avoid the fountain effect are proposed. From the energetic viewpoint, artificial upwelling using offshore wind energy is a promising way to fertilize large open sea regions. This mariculture application is, however, severely subjected to atmosphere and ocean climatology, as well as to ecological dynamics. The general problem is multidisciplinary, and some important physical, engineering and ecological questions need to be seriously addressed to improve our confidence in the approach presented here.Keywords: artificial upwelling; mariculture applications; ocean fertilization; offshore wind energy; spar-buoy wind turbine.Afloramiento artificial producido con energía eólica con aplicación a la maricultura Resumen: Analizamos el uso de la energía eólica marina como fuente de energía para aflorar aguas profundas ricas en nutrientes a las capas fóticas del océano. Una turbina de viento tipo boya-pértiga, con un tubo rígido de unos 300 m de largo, se propone para transportar las aguas profundas hasta la superficie. La energía mínima necesaria para elevar el agua es la diferencia de energa potencial entre las aguas superficiales dentro y fuera de la tubería, que depende del perfil de densidad de fondo. El salto superficial de agua, o cabezal hidráulico h, calculado para varios perfiles analíticos y experimentales de densidad, resulta ser del orden de 10 cm. Si la potencia total de la turbina (del orden de varios MW) se utiliza para elevar el agua (suponiendo una eficiencia de la bomba del 100%), en un flujo sin fricción, el transporte de volumen de agua transportado a las capas fóticas es muy elevado, del orden de miles de m 3 s −1 . En un caso más realista, teniendo en cuenta la fricción en tuberías de un ancho del orden de 10 m radio, y una potencia proporcionada...

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Dynamic response and power performance of a combined Spar-type floating wind turbine and coaxial floating wave energy converter

Cited by 159 publications

References 7 publications

Enhancing Wave Energy Competitiveness through Co-Located Wind and Wave Energy Farms. A Review on the Shadow Effect

Enhancing Wave Energy Competitiveness through Co-Located Wind and Wave Energy Farms. A Review on the Shadow Effect

Numerical Simulation of Fluctuating Wind Effects on an Offshore Deck Structure

Artificial upwelling using offshore wind energy for mariculture applications

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