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2. Assessing the impact of waves and platform dynamics on floating wind-turbine energy production.

Author

Fontanella, Alessandro, Colpani, Giorgio, De Pascali, Marco, Muggiasca, Sara, and Belloli, Marco

Subjects
WIND turbines, ENERGY industries, ENERGY conversion, TURBOMACHINE blades, WINDMILLS
Abstract

Waves have the potential to increase the power output of a floating wind turbine by forcing its rotor to move against the wind. Starting from this observation, we use four multi-physics models of increasing complexity to investigate the role of waves and platform movements in the energy conversion process of four floating wind turbines of 5–15 MW in the Mediterranean Sea. Progressively adding realism to our simulations, we show that large along-wind rotor movements are needed to increase the power output of a floating wind turbine; however, these are prevented by the current technology of spar and semi-submersible platforms. Wind turbulence is the main cause of power fluctuations for the four floating wind turbines we examined and is preponderant over the effect of platform motions due to waves. In a realistic met-ocean environment, the power curve of the floating wind turbines we studied is lower than that obtained with a fixed foundation, with reductions in the annual energy production of 1.5 %–2.5 %. The lower energy production is mainly ascribed to the platform mean tilt, which reduces the rotor's effective area. [ABSTRACT FROM AUTHOR]

Published
2024
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15. Design of an aeroelastic physical model of the DTU 10MW wind turbine for a floating offshore multipurpose platform prototype

Author

Muggiasca Sara, Fontanella Alessandro, Di Carlo Simone, Giberti Hermes, Facchinetti Alan, and Belloli Marco

Subjects
The Blue Growth Farm, H2020, wind energy, BGF, Floating wind turbine
Abstract

Multi-purpose offshore structures are very complex systems to be designed as many different requirements have to be taken into account simultaneously. Experimental tests on scaled models can be very useful to verify structural behavior and to validate numerical models. The definition of the scale can play a key role in performing tests as high scales, closer to full-scale, are generally related to more reliable results. The present paper concerns the design of a wind turbine model for a large-scale model of a Multi-purpose offshore Platform developed within the EU project H2020 Blue Growth Farm. This project aims at developing an offshore farm, based on a modular floating structure that integrates wave energy converters and a wind turbine with aquaculture. The scale model of the complete structure will be deployed at the Natural Ocean Engineering Laboratory (NOEL). The paper will focus on the strategies adopted to scale 1:15 the DTU 10 MW wind turbine in order to represent both the main aeroelastic features and all the functionalities of a real machine. The complete design of the machine and its control will be also provided.

Published
2021

16. Physical model tests on spar buoy for offshore floating wind energy conversion

Author

Roberto Tomasicchio, Giuseppe, Vicinanza, Diego, Belloli, Marco, Lugni, Claudio, Latham, John-Paul, Gregorio Iglesias Rodriguez, Jose, Jensen, Bjarne, Vire, Axelle, Monbaliu, Jaak, Taruffi, Federico, Pustina, Luca, Leone, Elisa, Russo, Sara, Francone, Antonio, Fontanella, Alessandro, Di Carlo, Simone, Muggiasca, Sara, Decorte, Griet, Rivera-Arreba, Irene, Ferrante, Vincenzo, Battistella, Tommaso, Guanche Garcia, Raul, Martínez Díaz, Abel, Elsässer, Björn, Via-Estrem, Lluis, Xiang, Jiansheng, Thøtt Andersen, Morten, Bech Kramer, Morten, Musci Jens Peter Kofoed, Elena, Lusito, Letizia, Roberto Tomasicchio, Giuseppe, Vicinanza, Diego, Belloli, Marco, Lugni, Claudio, Latham, John-Paul, Gregorio Iglesias Rodriguez, Jose, Jensen, Bjarne, Vire, Axelle, Monbaliu, Jaak, Taruffi, Federico, Pustina, Luca, Leone, Elisa, Russo, Sara, Francone, Antonio, Fontanella, Alessandro, Di Carlo, Simone, Muggiasca, Sara, Decorte, Griet, Rivera-Arreba, Irene, Ferrante, Vincenzo, Battistella, Tommaso, Guanche Garcia, Raul, Martínez Díaz, Abel, Elsässer, Björn, Via-Estrem, Llui, Xiang, Jiansheng, Thøtt Andersen, Morten, Bech Kramer, Morten, Musci Jens Peter Kofoed, Elena, and Lusito, Letizia

Published
2020

21. Physical Model Tests on Spar Buoy for Offshore Floating Wind Energy Conversion

Author

Tomasicchio, Giuseppe Roberto, Vicinanza, Diego, Belloli, Marco, Lugli, Claudio, Latham, John-Paul, Iglesias Rodriguez, Jose Gregorio, Jensen, Bjarne, Vire, Axelle, Monbaliu, Jaak, Taruffi, Federico, Pustina, Luca, Leone, Elisa, Russo, Sara, Francone, Antonio, Fontanella, Alessandro, Di Carlo, Simone, Muggiasca, Sara, Decorte, Griet, Rivera, Irene, Ferrante, Vincenzo, Battistella, Tommaso, Guanche García, Raúl, Martínez Díaz, Abel, Elsässer, Björn, Via-Estrem, Lluis, Xiang, Jiansheng, Andersen, Morten Thøtt, Kofoed, Jens Peter, Bech Kramer, Morten, Musci, Elena, Lusito, Letizia, and Universidad de Cantabria

Subjects
hydrodynamic behavior, Hydrodynamic behavior, offshore structures, Spar buoy, floating wind turbine, spar buoy, Offshore structures, Floating wind turbine
Abstract

The present paper describes the experiences gained from the design methodology and operation of a 3D physical modelexperiment aimed to investigate the dynamic behaviour of a spar buoy floating offshore wind turbine. The physical model consists in a Froude-scaled NREL 5MW reference wind turbine (RWT) supported on the OC3-Hywind floating platform. Experimental tests have been performed at Danish Hydraulic Institute (DHI) offshore wave basin within the European Union-Hydralab+ Initiative, in April 2019. The floating wind turbine model has been subjected to a combination of regular and irregular wave attacks and different wind loads. Measurements of displacements, rotations, accelerations, forces response of the floating model and at the mooring lines have been carried out. First, free decay tests have been analysed to obtain the natural frequency and the modal damping ratios of each degree of freedom governing the offshore. Then, the results concerning regular waves, with orthogonal incidence to the structure, are presented. The results show that most of longitudinal dynamic response occurs at the wave frequency and most of lateral dynamic response occurs at rigid-body frequencies. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 654110, HYDRALAB+.

Published
2020

24. Modal parameters identification and monitoring of two arches

Author

Belloli Marco, Bayati Ilmas, Giappino Stefano, Muggiasca Sara, and Rosa Lorenzo

Subjects
Engineering (General). Civil engineering (General), TA1-2040
Abstract

The paper presents the results of the modal parameters identification and of the continuous monitoring of two arches built in the new area of Expo 2015 in Milan. The activities on the arches were performed during the erection stage and they were planned as a consequence of preliminary studies performed at Politecnico di Milano wind tunnel, that highlighted dynamic instability due to the wind. In particular, the first two bending modes of the structures showed a critical behaviour and for this reason a TMD (Tuned Mass Damping) system was designed in order to control these modes. At first, frequencies, damping and modal deflected shapes were evaluated in order to check the numerical FEM model, to tune the TMD system and to check its correct functioning. The two arches were then monitored for several months to observe their dynamic behaviour under different wind conditions. A good database about the strongest and the most frequent winds in the site was obtained. The accelerations registered under strong wind conditions did not reach dangerous levels for the structures, moreover these results showed a good agreement with the wind tunnel ones.

Published
2015
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26. Physical Model Tests on Spar Buoy for Offshore Floating Wind Energy Conversion:Users group H+ - DHI-09-SparBOFWEC

Author

Tomasicchio, Giuseppe Roberto, Vicinanza, Diego, Belloli, Marco, Lugni, Claudio, Latham, John-Paul, Iglesias, Gregorio, Jensen, Bjarne, Vire, Axelle, Monbaliu, Jaak, Taruffi, Federico, Pustina, Luca, Leone, Elisa, Russo, Sara, Francone, Antonio, Fontanella, Alessandro, Di Carlo, Simone, Muggiasca, Sara, Decorte, Griet, Rivera-Arreba, Irene, Ferrante, Vincenzo, Battistella, Tommaso, Garcia, Raul Guanche, Díaz, Abel Martínez, Elsäßer, Björn, Via-Estrem, Lluis, Xiang, Jiansheng, Andersen, Morten Thøtt, Kofoed, Jens Peter, and Kramer, Morten Bech

Abstract

The present paper describes the experiences gained from the design methodology and operation of a 3D physical model experiment aimed to investigate the dynamic behaviour of a spar buoy (SB) off-shore floating wind turbine (WT) under different wind and wave conditions. The physical model tests have been performed at Danish Hydraulic Institute (DHI) off-shore wave basin within the European Union-Hydralab+ Initiative, in April 2019. The floating WT model has been subjected to a combination of regular and irregular wave attacks and wind loads.

Published
2019

29. Wind Resistant Design of a Very Large Observation Wheel

Author

Muggiasca, Sara, Giappino, Stefano, Argentini, Tommaso, Collina, Andrea, Manenti, Alessandra, and Diana, Giorgio

Abstract

AbstractFrom an aerodynamic point of view, very large observation wheels are complex structures. Several parts are slender with bluff cross sections, and therefore wind–structure interaction effects can influence their dynamic behaviour. Vortex-induced vibrations (VIVs), wake-effects, galloping instability, wind–rain interactions and buffeting response must be considered and studied during the design of substructures such as the A-frames and spoke cables. Both wind-tunnel tests and numerical tools can be used to assess the expected vibration levels and eventually to design appropriate countermeasures. In this paper, the Ain Dubai observation wheel is taken as a test case to present a procedure that can be applied to verify and validate the design of such structures when considering the effects of natural wind. For the A-frame, which turned out to be prone to VIVs during wind-tunnel tests on a scaled model, tuned mass dampers are studied as mitigation devices; for the spoke cables, several parameters affecting their aerodynamics were investigated in a wind tunnel on a full-scale model: inclination angle, structural damping and LED equipment. The characterization of these effects allowed both the performance of the cable damping system to be assessed, and configurations that could not perform adequately to be discarded.

Published
2022
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39. Numerical Modelling of Sail Aerodynamic Behaviour in Dynamic Conditions

Author

Fossati, FABIO VITTORIO and Muggiasca, Sara

Subjects
Oscillation amplitude, Nonlinear polynomials, Aerodynamic coefficients, Experimental data, Time-domain model, Sea state, Mathematical approach, Three dimensional effect, Reduced velocity, Wind speed, Dynamic condition, Wind tunnel tests, Dynamic performance, Forced harmonic motions, Frequency ranges, Motion dynamics, Non-linear numerical model, Nonlinear effect, Numerical modelling, Realistic environments, Rheological models, Scaled models, Time derivative, Time domain
Published
2010

45. Wind loading on trees integrated with a building envelope

Author

Aly, Aly Mousaad, primary, Fossati, Fabio, additional, Muggiasca, Sara, additional, Argentini, Tommaso, additional, Bitsuamlak, Girma, additional, Franchi, Alberto, additional, Longarini, Nicola, additional, Crespi, Pietro, additional, and Chowdhury, Arindam Gan, additional

Published
2013
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