The Effect of Second-order Hydrodynamics on Floating Offshore Wind Turbines

Roald, Line; Jonkman, Jason; Robertson, Amy; Chokani, Ndaona

doi:10.1016/j.egypro.2013.07.178

Cited by 96 publications

(42 citation statements)

References 5 publications

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“…where S(ω) is the one-sided wave spectrum; φmn is the phase of motion QTFs; φm and φn are the random phases of stochastic waves at the frequency of ωm and ωn, respectively, which are assumed to uniformly distribute between 0 and 2π [49]. It is worth noting that the magnitudes of motion response differ from different wave phase values.…”

Section: Qtf ( ) M + A( ) B( ) + C Qtf ( )mentioning

confidence: 99%

“…The hydrodynamic coefficients of these three terms can be obtained by solving the boundaryvalue problem using panel method [45]. Previous studies [46][47][48][49] had demonstrated that the first-order theory for potential flow is insufficient for the FOWT dynamics prediction. The second-order hydrodynamic theory can more accurately account for the nonlinear free-surface boundary conditions and the loadings about the actual instantaneous wetted surface of a platform, which may be critical in the hydrodynamic analysis.…”

Section: Hydrodynamics Modelingmentioning

confidence: 99%

“…Furthermore, the second-order motion responses in the rated operational wave condition can be computed as [49]: …”

Section: Qtf ( ) M + A( ) B( ) + C Qtf ( )mentioning

confidence: 99%

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Directionality Effects of Aligned Wind and Wave Loads on a Y-Shape Semi-Submersible Floating Wind Turbine under Rated Operational Conditions

et al. 2017

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Abstract:The Y-shape (triangular) semi-submersible foundation has been adopted by most of the built full-scale floating wind turbines, such as Windfloat, Fukushima Mirai and Shimpuu. Considering the non-fully-symmetrical shape and met-ocean condition, the foundation laying angle relative to wind/wave directions will not only influence the downtime and power efficiency of the floating turbine, but also the strength and fatigue safety of the whole structure. However, the dynamic responses induced by various aligned wind and wave load directions have scarcely been investigated comparatively before. In our study, the directionality effects are investigated by means of combined wind and wave tests and coupled multi-body simulations. By comparing the measured data in three load directions, it is found that the differences of platform motions are mainly derived from the wave loads and larger pitch motion can always be observed in one of the directions. To make certain the mechanism underlying the observed phenomena, a coupled multi-body dynamic model of the floating wind turbine is established and validated. The numerical results demonstrate that the second-order hydrodynamic forces contribute greatly to the directionality distinctions for surge and pitch, and the first-order hydrodynamic forces determine the variations of tower base bending moments and nacelle accelerations. These findings indicate the directionality effects should be predetermined comprehensively before installation at sea, which is important for the operation and maintenance of the Y-shape floating wind turbines.

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Section: Qtf ( ) M + A( ) B( ) + C Qtf ( )mentioning

confidence: 99%

Section: Hydrodynamics Modelingmentioning

confidence: 99%

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Directionality Effects of Aligned Wind and Wave Loads on a Y-Shape Semi-Submersible Floating Wind Turbine under Rated Operational Conditions

et al. 2017

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“…Some extensions to the secondorder potential flow was performed e.g. by Marino et al (2011) and Roald et al (2013). Even with second-order hydrodynamic terms included, however, the potential hydrodynamic theory might not completely apply to floating wind turbine platforms due to the large displacements encountered (Matha et al 2011).…”

Section: Motivation and Objectivesmentioning

confidence: 99%

CFD Investigation of a Complete Floating Offshore Wind Turbine

Leble

Barakos

2016

Mare-Wint

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This chapter presents numerical computations for floating offshore wind turbines for a machine of 10-MW rated power. The rotors were computed using the Helicopter Multi-Block flow solver of the University of Glasgow that solves the Navier-Stokes equations in integral form using the arbitrary Lagrangian-Eulerian formulation for time-dependent domains with moving boundaries. Hydrodynamic loads on the support platform were computed using the Smoothed Particle Hydrodynamics method. This method is mesh-free, and represents the fluid by a set of discrete particles. The motion of the floating offshore wind turbine is computed using a Multi-Body Dynamic Model of rigid bodies and frictionless joints. Mooring cables are modelled as a set of springs and dampers. All solvers were validated separately before coupling, and the loosely coupled algorithm used is described in detail alongside the obtained results. Greekartificial viscosity parameter (-) adiabatic index (-)

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“…by Marino et al (2011) and Roald et al (2013). Even with second-order hydrodynamic terms included, however, the potential hydrodynamic theory might not completely apply to floating wind turbine platforms due to the large displacements encountered (Matha et al (2011)).…”

mentioning

confidence: 99%

Demonstration of a coupled floating offshore wind turbine analysis with high-fidelity methods

Leble

Barakos

2016

Journal of Fluids and Structures

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This paper presents results of numerical computations for floating off-shore wind turbines using, as an example, a machine of 10-MW rated power. The aerodynamic loads on the rotor are computed using the Helicopter Multi-Block flow solver developed at the University of Liverpool. The method solves the Navier-Stokes equations in integral form using the arbitrary LagrangianEulerian formulation for time-dependent domains with moving boundaries. Hydrodynamic loads on the support platform are computed using the Smooth-ed Particle Hydrodynamics method, which is mesh-free and represents the water and floating structures by a set of discrete elements, referred to as particles. The motion of the floating offshore wind turbine is computed using a Multi-Body Dynamic Model of rigid bodies and frictionless joints. Mooring cables are modelled as a set of springs and dampers. All solvers were validated separately before coupling, and the results are presented in this paper. The importance of coupling is assessed and the loosely coupled algorithm used is described in detail alongside the obtained results.

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The Effect of Second-order Hydrodynamics on Floating Offshore Wind Turbines

Cited by 96 publications

References 5 publications

Directionality Effects of Aligned Wind and Wave Loads on a Y-Shape Semi-Submersible Floating Wind Turbine under Rated Operational Conditions

Directionality Effects of Aligned Wind and Wave Loads on a Y-Shape Semi-Submersible Floating Wind Turbine under Rated Operational Conditions

CFD Investigation of a Complete Floating Offshore Wind Turbine

Demonstration of a coupled floating offshore wind turbine analysis with high-fidelity methods

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