Hydrodynamics of the wind float OC3-Hywind with mooring loads estimated by the modular system

Lin, Yu Hsien; Hsu, Chao Li; Kao, Shin Hung

doi:10.1007/s00773-018-0549-z

Cited by 6 publications

(4 citation statements)

References 22 publications

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“…It was observed that the numerical predictions of platform pitch were slightly larger than the test results. Lin et al [8] investigated the hydrodynamic responses of the OC3-Hywind concept influenced by the mooring system that was modelled using a quasi-static method. The contributions of mooring loads to the platform motions were studied.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of an integrated floating energy system based on coupled analysis

Yang

Bashir

Wang

et al. 2020

Energy Conversion and Management

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An integrated floating energy system consisting of different types of energy devices is an ideal option for reducing the levelized cost of energy by enhancing the power production capacity. This study proposes a concept of an integrated energy system by combining two tidal turbines with a floating wind turbine. In order to investigate the power performance and dynamic responses of the hybrid concept, a novel coupled aero-hydro-servo-elastic tool is developed based on a commercial hydrodynamic analysis software package. In addition, a torque-pitch controller and the AeroDyn module are integrated within the coupled tool for evaluating the power performance of the tidal turbines under dynamic inflow conditions. Experimental data and numerical results obtained by OpenFAST are used to verify the accuracy of the coupled tool in predicting dynamic responses of the integrated energy system. The dynamic responses and power production under different environmental conditions are obtained by conducting a series of simulations. The results indicate that the total power production is increased by 3.84% to 6.46%. The transient behavior of the platform is improved and the tension fluctuation in mooring lines are significantly reduced by the hydrodynamic damping provided by the tidal turbines. In addition, the tidal turbines have no negative influences on the aero-elastic responses and power performance of the wind energy system.The results have demonstrated the advantages of the integrated energy system in enhancing the power production and improving the dynamic performance.

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Section: Introductionmentioning

confidence: 99%

Performance evaluation of an integrated floating energy system based on coupled analysis

Yang

Bashir

Wang

et al. 2020

Energy Conversion and Management

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“…Offshore wind turbines, in contrast to onshore wind turbines, have higher wind power production rate and longer lifespan. Therefore, due to stability and reliability of offshore wind sources, this industry has received more and more attention from investors in recent years [1]. RenewableUK's Offshore Wind Project intelligence reported that the global offshore wind projects have increased from 95 GW in 2017 to 104 GW in 2018 [2].…”

Section: Introductionmentioning

confidence: 99%

Structural integrity assessment of floating offshore wind turbine support structures

et al. 2020

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Floating offshore wind turbines are becoming more attractive to the wind industry due to their capability to operate larger turbines in deeper waters. The floating support structures are anchored to the seabed via mooring chains to impede the structure's unwanted movements. The combination of cyclic stresses and the corrosive marine environment makes the floating support structures vulnerable to corrosion pitting and subsequently fatigue crack initiation and propagation. In this study a framework is proposed to simulate fatigue crack growth from multiple corrosion pits at critical spots of the Spar-type floating support structures to examine the status of the crack during several years of operation. The proposed advanced fracture mechanics based approach provides a methodology to assess the integrity of the structure and subsequently plan for preventive or curative maintenance. The crack growth rate is examined for both singular and multiple cracks at different R ratios and for different stress levels using ABAQUS XFEM. Following numerical simulations, a sensitivity analysis is carried out using Crackwise software for different values of plate thickness, R ratio and initial crack size. The numerical results are discussed in terms of the corrosion pitting effects on fatigue life assessment of floating offshore wind turbines.

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“…While the boundary-value problems are resolved through the Direct Search method [15], the mooring load on the floater can be obtained accompanied with coupling relationship of 6-DOF motion. In order to calculate hydrodynamic forces of the floater, the three-dimensional potential flow method [16][17][18], including steady and unsteady terms, was applied. For solving steady-state problems, the translating sources are distributed over the floater by the panel method [19] and the complex plane contour integral algorithm [20].…”

Section: Introductionmentioning

confidence: 99%

“…Since it is challenging to simulate motion responses of marine structures, this study upgraded a modular system [18] to simplify programming and calculation. Modularization can be thought of as the predecessor of object-oriented technology, which shortens the processing time and makes the program more flexible.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Hydrodynamic Forces for Floating Offshore Wind Turbines on Spar Buoys and Tension Leg Platforms with the Mooring Systems in Waves

2019

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This study aims to develop a modularized simulation system to estimate dynamic responses of floating Offshore Wind Turbines (OWTs) based on the concepts of spar buoy and Tension Leg Platform (TLP) corresponding with two typical mooring lines. The modular system consists of the hydrodynamic simulator based the Cummins time domain equation, the Boundary Element Method (BEM) solver based on the 3D source distribution method, and an open-source visualization software ParaView to analyze the interaction between floating OWTs and waves. In order to realize the effects of mooring loads on the floating OWTs, the stiffness and damping matrices are applied to the quasi-static mooring system. The Response Amplitude Operators (RAOs) are compared between our predicted results and other published data to verify the modularized simulation system and understand the influence of mooring load on the motion responses in regular or irregular waves. It is also demonstrated that the quasi-static mooring system is applicable to different types of mooring lines as well as determining real-time motion responses. Eventually, wave load components at the resonance frequencies of different motion modes for selected floating OWTs would be present in the time domain.

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Hydrodynamics of the wind float OC3-Hywind with mooring loads estimated by the modular system

Cited by 6 publications

References 22 publications

Performance evaluation of an integrated floating energy system based on coupled analysis

Performance evaluation of an integrated floating energy system based on coupled analysis

Structural integrity assessment of floating offshore wind turbine support structures

Investigation of Hydrodynamic Forces for Floating Offshore Wind Turbines on Spar Buoys and Tension Leg Platforms with the Mooring Systems in Waves

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