A Comparative Investigation of Prevalent Hydrodynamic Modelling Approaches for Floating Offshore Wind Turbine Foundations: A TetraSpar Case Study

Thomsen, Jonas Bjerg; Têtu, Amélie; Stiesdal, Henrik

doi:10.3390/jmse9070683

Cited by 13 publications

(3 citation statements)

References 14 publications

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“…Solution this which allows reducing the number of tension tendons. Finally, OrthoSpar also uses small ballast tanks which are connected to each one the lower vertices of the floating platformnote that previous versions of TetraSpar used to have these ballast tanks also, however, during its design optimisation phase these were replaced with some lager diameter lower steel piles (Bredmose et al, 2017;Thomsen et al, 2021). Both concepts are designed to be fully installed onshore or at the port sidei.e., the floater platform will be assembled using land lifting equipment at the port side and then to assemble the wind turbine to the platform.…”

Section: The Orthosparmentioning

confidence: 99%

OrthoSpar, a novel substructure concept for floating offshore wind turbines: Physical model tests under towing conditions

Pérez-Collazo¹,

Pérez-Collazo²,

Abanades³

et al. 2022

Ocean Engineering

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Section: The Orthosparmentioning

confidence: 99%

OrthoSpar, a novel substructure concept for floating offshore wind turbines: Physical model tests under towing conditions

Pérez-Collazo¹,

Pérez-Collazo²,

Abanades³

et al. 2022

Ocean Engineering

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“…When modeling the structure in OrcaFlex, other studies such as [33] have used the "6D Buoy" objects of the "Spar Buoy" type to model each component of the TetraSpar platform. These rigid objects allow for estimation of the environmental loads on each component and solve the bodies' six DoF motion response.…”

Section: The Orcaflex Modelmentioning

confidence: 99%

Modeling the TetraSpar Floating Offshore Wind Turbine Foundation as a Flexible Structure in OrcaFlex and OpenFAST

et al. 2021

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Floating offshore wind turbine technology has seen an increasing and continuous development in recent years. When designing the floating platforms, both experimental and numerical tools are applied, with the latter often using time-domain solvers based on hydro-load estimation from a Morison approach or a boundary element method. Commercial software packages such as OrcaFlex, or open-source software such as OpenFAST, are often used where the floater is modeled as a rigid six degree-of-freedom body with loads applied at the center of gravity. However, for final structural design, it is necessary to have information on the distribution of loads over the entire body and to know local internal loads in each component. This paper uses the TetraSpar floating offshore wind turbine design as a case study to examine new modeling approaches in OrcaFlex and OpenFAST that provide this information. The study proves the possibility of applying the approach and the extraction of internal loads, while also presenting an initial code-to-code verification between OrcaFlex and OpenFAST. As can be expected, comparing the flexible model to a rigid-body model proves how motion and loads are affected by the flexibility of the structure. OrcaFlex and OpenFAST generally agree, but there are some differences in results due to different modeling approaches. Since no experimental data are available in the study, this paper only forms a baseline for future studies but still proves and describes the possibilities of the approach and codes.

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“…In addition, research on fully coupled methods for FOWT is also a focus of attention. Thomsen et al [11] investigated and compared three different approaches: Morison approach, linear boundary element method (BEM), and a hybrid approach and evaluated their applicability on the TetraSpar FOWT concept. However, the impact of ocean currents and wind loads on wind turbines is not considered.…”

Section: Introductionmentioning

confidence: 99%

Research on the Dynamic Performance of a Novel Floating Offshore Wind Turbine Considering the Fully-Coupled-Effect of the System

Zhang

Wang

Cai

et al. 2022

JMSE

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Floating offshore wind turbines (FOWTs) still face many challenges in improving platform stability. A fully submersible FOWT platform with inclined side columns is designed to tackle the current technical bottleneck of the FOWT platform, combining the structural characteristics of the semi-submersible and Spar platform. An integrated numerical model of FOWT is established considering the fully coupled effect, and the hydrodynamic performance of the novel FOWT, the semi-submersible FOWT, and the Spar FOWT are compared and analyzed under different wave incidence angles and wave frequencies, as well as the blade and tower dynamic response of the three FOWTs under the coupling effect of wind, wave, and current. The results show that the novel floating platform can significantly optimize the hydrodynamic performance and has a better recovery ability after being subjected to external loads. The novel floating platform can significantly reduce the heave peak and its corresponding wave frequency compared to the semi-submersible platform, reducing the possibility of heave resonance. FOWT operation should ensure positive wave inflow as far as possible to avoid excessive wave forces in the lateral direction. Both blade and tower dynamic response are affected by rotor rotation and tower vibration to varying degrees, while tower dynamic response is mainly affected by platform motion. This study suggests that the application of the novel FOWT concept is feasible and can be an alternative in offshore wind exploitation in deep water.

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A Comparative Investigation of Prevalent Hydrodynamic Modelling Approaches for Floating Offshore Wind Turbine Foundations: A TetraSpar Case Study

Cited by 13 publications

References 14 publications

OrthoSpar, a novel substructure concept for floating offshore wind turbines: Physical model tests under towing conditions

OrthoSpar, a novel substructure concept for floating offshore wind turbines: Physical model tests under towing conditions

Modeling the TetraSpar Floating Offshore Wind Turbine Foundation as a Flexible Structure in OrcaFlex and OpenFAST

Research on the Dynamic Performance of a Novel Floating Offshore Wind Turbine Considering the Fully-Coupled-Effect of the System

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