Outcomes of the DeepWind Conceptual Design

Paulsen, Uwe Schmidt; Borg, Michael; Madsen, Helge Aagaard; Pedersen, Troels; Hattel, Jesper Henri; Ritchie, Ewen; Ferreira, Carlos; Svendsen, Harald; Berthelsen, Petter Andreas; Smadja, Charles

doi:10.1016/j.egypro.2015.11.437

Cited by 45 publications

(37 citation statements)

References 5 publications

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“…Compared with conventional horizontal axis wind turbines (HAWTs), vertical axis wind turbines (VAWTs) exhibit several advantages that make them attractive candidates for more efficient off‐shore wind farms. In particular, the insensitivity to wind direction and the low center of gravity have caused a renewed surge of interest in VAWTs for floating, deep‐offshore applications …”

Section: Introductionmentioning

confidence: 99%

“…In particular, the insensitivity to wind direction and the low center of gravity have caused a renewed surge of interest in VAWTs for floating, deep-offshore applications. 1 To accelerate the adoption of the VAWT concept in the offshore wind industry, there is a need for a deeper understanding of their complex rotor aerodynamics. In most previous studies, 2,3 VAWTs have been idealized by modelling a single actuation surface, which coincides with the swept area of the rotor blades.…”

Section: Introductionmentioning

confidence: 99%

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An extended actuator cylinder model: Actuator‐in‐actuator cylinder (AC‐squared) model

Tavernier

Ferreira

2019

Wind Energy

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In this paper, the actuator‐in‐actuator cylinder (AC‐squared) model is presented. This model is an extension of the original actuator cylinder model of Madsen and is capable of modelling the effect of a two concentric actuation surfaces in 2D. The induced velocity at every point in the 2D field is affected by the force field acting on the two actuator cylinders. The equations are derived, and a model verification is performed using analytical solutions of flows, proof of flow equivalence, and using OpenFOAM calculations. Finally, the model is applied to different case studies, and the results are compared with a time‐dependent free wake vortex method.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An extended actuator cylinder model: Actuator‐in‐actuator cylinder (AC‐squared) model

Tavernier

Ferreira

2019

Wind Energy

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“…Visualisation of the coupled simulation of a floating VAWT inspired by the DeepWind concept using InWave‐FVW [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Description Of the Numerical Modelsmentioning

confidence: 99%

Impact of aerodynamic modelling on seakeeping performance of a floating vertical axis wind turbine

Leroy

Gilloteaux

Lynch³

et al. 2019

Wind Energy

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This study focuses on the impact of the aerodynamic model on the dynamic response of a floating vertical axis wind turbine (VAWT). It compares a state‐of‐the‐art quasi‐steady double multiple streamtube (DMS) solver, a prescribed vortex wake (PVW), and a free vortex wake (FVW) solver. The aerodynamic loads acting on a bottom‐fixed VAWT and computed with the three aerodynamic solvers are compared, then the dynamic responses of the floating turbine in irregular waves and turbulent wind with the different aerodynamic solvers are compared. Differences are observed, particularly in the mean motions of the platform. Eventually, the aerodynamic damping computed by the solvers are estimated with aerodynamic simulations on the turbine with imposed surge and pitch motions. The estimated damping can then be correlated with the dynamic response amplitude of the VAWT. Substantial discrepancies are observed between the three solvers at high tip speed ratio, when the rotor is highly loaded. It is shown that the quasi‐steady DMS solver seems to give greater amplitude of motions for the floating VAWT because of strong rotor/wake interaction that are not correctly accounted for.

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“…Thus, the development of FVAWTs increased and several FVAWT concepts have recently been proposed, including the DeepWind , VertiWind , Aerogenerator X and floating tilted axis concepts. Similar to the FHAWTs, the substructures supporting the FVAWTs can be categorized as spar, semi‐submersible and TLP types.…”

Section: Introductionmentioning

confidence: 99%

A comparative study on dynamic responses of spar‐type floating horizontal and vertical axis wind turbines

et al. 2016

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Interest in the exploitation of offshore wind resources using floating wind turbines has increased. Commercial development of floating horizontal axis wind turbines (FHAWTs) is emerging due to their commercial success in onshore and near-shore areas. Floating vertical axis wind turbines (FVAWTs) are also promising due to their low installation and maintenance costs. Therefore, a comparative study on the dynamic responses of FHAWTs and FVAWTs is of great interest. In the present study, a FHAWT employing the NREL 5 MW wind turbine and a FVAWT employing a Darrieus rotor, both mounted on the OC3 spar buoy, were considered. An improved control strategy was introduced for FVAWTs to achieve an approximately constant mean generator power for the above rated wind speeds. Fully coupled time domain simulations were carried out using identical, directional aligned and correlated wind and wave conditions. Due to different aerodynamic load characteristics and control strategies, the FVAWT results in larger mean tower base bending moments and mooring line tensions above the rated wind speed. Because significant two-per-revolution (2P) aerodynamic loads act on the FVAWT, the generator power, tower base bending moments and delta line tensions show prominent 2P variation. Consequently the FVAWT suffers from severe fatigue damage at the tower bottom. However, the dynamic performance of the FVAWT could be improved by increasing the number of blades , using helical blades or employing a more advanced control strategy, which requires additional research.

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Outcomes of the DeepWind Conceptual Design

Cited by 45 publications

References 5 publications

An extended actuator cylinder model: Actuator‐in‐actuator cylinder (AC‐squared) model

An extended actuator cylinder model: Actuator‐in‐actuator cylinder (AC‐squared) model

Impact of aerodynamic modelling on seakeeping performance of a floating vertical axis wind turbine

A comparative study on dynamic responses of spar‐type floating horizontal and vertical axis wind turbines

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