D1.2 Higher Order Hydroelastic Module

Saverin, Joseph; Perez‐Becker, Sebastian; Luna, Robert Behrens De; Marten, David; Gilloteaux, Jean‐Christophe; Kurnia, R.

doi:10.5281/zenodo.6958081

Cited by 2 publications

(2 citation statements)

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“…Hence, modelling approaches for FOWTs need to take into account and couple all the above-mentioned effects, resulting in a high level of complexity. Coupled areo-hydro-servo-elastic models have been developed (Jonkman and Matha, 2011;Chen et al, 2019;Ramos-García et al, 2021;Saverin et al, 2021) but accurate tuning and validation are required to evaluate their accuracy and reliability. Higher fidelity approaches, such as Computational Fluid Dynamics (CFD), are unfeasible at an early 80 design stage due to the large computational cost, and their reliability still needs to be tested through accurate validation (Chen et al, 2020).…”

Section: Background and Motivationmentioning

confidence: 99%

On the characteristics of the wake of a wind turbine undergoing large motions caused by a floating structure: an insight based on experiments and multi-fidelity simulations from the OC6 Phase III Project

Cioni

Papi

Pagamonci

et al. 2023

Preprint

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Abstract. This study reports the results of the second round of analyses of the OC6 project Phase III. While the first round investigated rotor aerodynamic loading, here focus is given to the wake behavior of a floating wind turbine under large motion. Wind tunnel experimental data from the UNsteady Aerodynamics for FLOating Wind (UNAFLOW) project are compared with the results of simulations provided by participants with methods and codes of different levels of fidelity. The effect of platform motion both on the near and the far wake is investigated. More specifically, the behavior of tip vortices in the near wake is evaluated through multiple metrics, such as streamwise position, core radius, convection velocity, and circulation. Additionally, the onset of velocity oscillations in the far wake is analyzed because this can have a negative effect on stability and loading of downstream rotors. Results in the near wake for unsteady cases confirm that simulations and experiments tend to diverge from the expected linearized quasi-steady behavior when the rotor reduced frequency increases over 0.5. Additionally, differences across the simulations become significant, suggesting that further efforts are required to tune the currently available methodologies in order to correctly evaluate the aerodynamic response of a floating wind turbine in unsteady conditions. Regarding the far wake, it is seen that, in some conditions, numerical methods over-predict the impact of platform motion on the velocity fluctuations. Moreover, results suggest that, different from original expectations about a faster wake recovery in a floating wind turbine, the effect of platform motion on the far wake seems to be limited or even oriented to the generation of a wake less prone to dissipation.

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Section: Background and Motivationmentioning

confidence: 99%

On the characteristics of the wake of a wind turbine undergoing large motions caused by a floating structure: an insight based on experiments and multi-fidelity simulations from the OC6 Phase III Project

Cioni

Papi

Pagamonci

et al. 2023

Preprint

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“…Readers interested in more detailed descriptions of the implementation work of QBlade-Ocean are referred to the technical report (Saverin et al, 2021) with the sole focus on methodology and implantation as well as the online documentation (QBlade Documentation, 2022).…”

Section: Qbladementioning

confidence: 99%

Verifying QBlade-Ocean: A Hydrodynamic Extension to the Wind Turbine Simulation Tool QBlade

Behrens de Luna,

Perez-Becker,

Saverin

et al. 2023

Preprint

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Abstract. To realize the projected increase in world-wide demand for floating offshore wind, numerical simulation tools must capture the relevant physics with a high level of detail while being numerically efficient. This allows engineers to have better designs based on more accurate predictions of the design driving loads, potentially enabling an economic breakthrough. The existing generation of offshore wind turbines is reaching a juncture, where traditional approaches, such as the blade element momentum theory and actuator disc models, are becoming inadequate due to the increasing occurrence of substantial blade deflections. QBlade is a tool that includes a higher fidelity aerodynamic model based on lifting-line theory, capable of accurately modeling such scenarios. In order to enable the simulation of offshore conditions in QBlade, and to make use of this aerodynamic capability for novel offshore wind turbine designs, a hydrodynamic module called QBlade-Ocean was developed. In the present work, this module is validated and verified with two experimental campaigns and two state-of-the art simulation frameworks on three distinct floating offshore wind turbine concepts. The results confirm the implementation work and fully verify QBlade as a tool to be applied in offshore wind turbine simulations. Shortcomings reported by comparable tools in the non-linear response to irregular wave excitation are confirmed by QBlade and reiterate the need for further research in this field. A code-to-code comparison with the industry-designed Hexafloat concept highlights the coupled interactions on floating turbines that can lead to large differences in motion and load responses in otherwise identically behaving simulation frameworks.

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D1.2 Higher Order Hydroelastic Module

Cited by 2 publications

References 0 publications

On the characteristics of the wake of a wind turbine undergoing large motions caused by a floating structure: an insight based on experiments and multi-fidelity simulations from the OC6 Phase III Project

On the characteristics of the wake of a wind turbine undergoing large motions caused by a floating structure: an insight based on experiments and multi-fidelity simulations from the OC6 Phase III Project

Verifying QBlade-Ocean: A Hydrodynamic Extension to the Wind Turbine Simulation Tool QBlade

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