A panel method for floating offshore wind turbine simulations with fully integrated aero- and hydrodynamic modelling in time domain

Netzband, Stefan; Schulz, Christian W.; Göttsche, Ulf; González, Daniel Ferreira; Abdel‐Maksoud, Moustafa

doi:10.1080/09377255.2018.1475710

Cited by 20 publications

(15 citation statements)

References 10 publications

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“…Wake visualisation of a two‐bladed model turbine in yawed inflow computed by the free vortex wake boundary element method pan MARE 8 . Blades are coloured blue, trailing vortices in red…”

Section: Yaw Moment and Cone Anglementioning

confidence: 99%

“…Wake visualisation of a two-bladed model turbine in yawed inflow computed by the free vortex wake boundary element method panMARE. 8 Blades are coloured blue, trailing vortices in red due to the dynamic change of AoA and tangential inflow velocity, the maximum and minimum blade loads arising from this effect occur slightly delayed yielding a small contribution to the yaw moment.…”

Section: Yaw Moment and Cone Anglementioning

confidence: 99%

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Experimental and numerical investigation of the yaw moment of a downwind coned wind turbine rotor

et al. 2022

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The yaw moment of wind turbine rotors has never been in the focus of wind turbine aerodynamics. With the increasing activities in the development of support structures for Floating Offshore Wind Turbines (FOWT), which passively align with the wind, the interest has shifted, as an accurate determination of the yaw moment is a crucial issue for a successful design of such power plants. A downwind coned rotor is a promising option to increase the yaw moment and therefore the self‐alignment capability of a passively yawing FOWT. Unfortunately, experimental and numerical studies on the estimation of the yaw moment of wind turbine rotors are rare. This is especially the case for downwind coned rotors. The aim of the present work is to provide reliable knowledge in this field. For this purpose, an extensive experimental and numerical study is carried out to determine the yaw moment of a downwind coned rotor. The results obtained from measurements in the wind tunnel are compared to those of simulations using a high fidelity RANS method and a blade element momentum theory (BEMT) method. BEMT is widely applied and can be considered as state of the art for predicting aerodynamic loads on FOWTs. However, the basic assumptions of BEMT do not account for a realistic influence of the skewed wake, so that the application of a correction method is necessary. In this work, the frequently used wake skew correction method based on Pitt and Peters is utilised and its influence on the calculation of the yaw moment is investigated. It is shown that this correction method yields a significant overprediction of the yaw moment in comparison to the measurements and consequently even impairs the quality of the simulation in this case. In contrast to this, the wake‐resolving RANS method is capable of reproducing the measurements with reasonable accuracy and provides valuable insight into the role of the lateral force for the measurement of the yaw moment.

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“…Wake visualisation of a two‐bladed model turbine in yawed inflow computed by the free vortex wake boundary element method pan MARE 8 . Blades are coloured blue, trailing vortices in red…”

Section: Yaw Moment and Cone Anglementioning

confidence: 99%

Section: Yaw Moment and Cone Anglementioning

confidence: 99%

Experimental and numerical investigation of the yaw moment of a downwind coned wind turbine rotor

et al. 2022

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“…As a part of the VAMOS project, a simulation study on the transient aerodynamic phenomena related to the Floatgen FOWT prototype equipped with a 2 MW Vestas V80 wind turbine has EERA DeepWind conference 2023 Journal of Physics: Conference Series 2626 (2023) 012064 IOP Publishing doi:10.1088/1742-6596/2626/1/012064 2 been carried out and is presented in this work. A comparison of the simulation results of the state-of-the-art BEMT method AeroDyn [3] and the free-wake panel method panMARE [4] is performed. In the analysis, transient aerodynamic phenomena in the load response of the Vestas V80 turbine subjected to a number of typical unsteady scenarios are identified.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Unsteadiness on the Aerodynamic Loads of a Floating Offshore Wind Turbine

Schulz,

Özinan,

Netzband

et al. 2023

J. Phys.: Conf. Ser.

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The role of unsteadiness in the aerodynamics of Floating Offshore Wind Turbines (FOWT) remains a subject of discussion among the research community. Therefore, it must be investigated whether and to what extent transient aerodynamic phenomena impact the loads of a wind turbine rotor undergoing motions in unsteady winds. The study of transient aerodynamic phenomena is closely linked to the question of whether the modern Blade Element Momentum Theory (BEMT) methods can be considered reliable for the simulation of FOWTs. In this work, investigations are carried out to identify the relevant transient aerodynamic phenomena and quantify their effects on the torque and thrust of the Floatgen wind turbine. A free-wake panel method is utilised to identify and quantify transient parts of the load response to a set of simplified unsteady scenarios: a wind gust, a harmonic surge motion and a rotor speed oscillation. Transient contributions to the load behaviour of the wind turbine can be identified in all scenarios under consideration. In addition, the ability of a state-of-the-art BEMT method to model the identified transient contributions is evaluated. While an agreement of the qualitative impact of the transient aerodynamic phenomena at moderate motion frequencies is found, a contradicting behaviour of the simulation models becomes apparent at high motion frequencies. This indicates the presence of a transient, three-dimensional wake effect that cannot be reproduced by the common unsteady corrections for BEMT methods.

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“…The cumulative fatigue damage of the structure was predicted in accordance with the DNV-RP-C203 standard. Netzband et al [14] investigated the platform motions of the 5 MW FOWT supported by the DeepCwind concept. An aero-hydrodynamic analysis was performed to investigate the wake development and the influence on blade loads.…”

Section: Introductionmentioning

confidence: 99%

Effects of Second-Order Hydrodynamics on the Dynamic Responses and Fatigue Damage of a 15 MW Floating Offshore Wind Turbine

Mei¹,

Xiong

2021

JMSE

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In order to investigate the effects of second-order hydrodynamic loads on a 15 MW floating offshore wind turbine (FOWT), this study employs a tool that integrates AQWA and OpenFAST to conduct fully coupled simulations of the FOWT subjected to wind and wave loadings. The load cases covering normal and extreme conditions are defined based on the met-ocean data observed at a specific site. The results indicate that the second-order wave excitations activate the surge mode of the platform. As a result, the surge motion is increased for each of the examined load case. In addition, the pitch, heave, and yaw motions are underestimated when neglecting the second-order hydrodynamics under the extreme condition. First-order wave excitation is the major contributor to the tower-base bending moments. The fatigue damage of the tower-base under the extreme condition is underestimated by 57.1% if the effect of second-order hydrodynamics is ignored. In addition, the accumulative fatigue damage over 25 years at the tower-base is overestimated by 16.92%. Therefore, it is suggested to consider the effects of second-order wave excitations of the floating platform for the design of the tower to reduce the cost of the FOWT.

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A panel method for floating offshore wind turbine simulations with fully integrated aero- and hydrodynamic modelling in time domain

Cited by 20 publications

References 10 publications

Experimental and numerical investigation of the yaw moment of a downwind coned wind turbine rotor

Experimental and numerical investigation of the yaw moment of a downwind coned wind turbine rotor

The Impact of Unsteadiness on the Aerodynamic Loads of a Floating Offshore Wind Turbine

Effects of Second-Order Hydrodynamics on the Dynamic Responses and Fatigue Damage of a 15 MW Floating Offshore Wind Turbine

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