Articles | Volume 5, issue 4
https://doi.org/10.5194/wes-5-1713-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-5-1713-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
10 Dec 2020
Research article |
| 10 Dec 2020
| 10 Dec 2020
Characterization of the unsteady aerodynamic response of a floating offshore wind turbine to surge motion
Simone Mancini
CORRESPONDING AUTHOR
Politecnico di Milano, Department of Mechanical Engineering, Milano, Italy
Koen Boorsma
TNO Energy Transition, Petten, the Netherlands
Marco Caboni
TNO Energy Transition, Petten, the Netherlands
Marion Cormier
University of Stuttgart, Institute of Aerodynamics and Gas Dynamics, Stuttgart, Germany
Thorsten Lutz
University of Stuttgart, Institute of Aerodynamics and Gas Dynamics, Stuttgart, Germany
Paolo Schito
Politecnico di Milano, Department of Mechanical Engineering, Milano, Italy
Alberto Zasso
Politecnico di Milano, Department of Mechanical Engineering, Milano, Italy
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Giorgia Guma, Galih Bangga, Thorsten Lutz, and Ewald Krämer
Wind Energ. Sci., 6, 93–110, https://doi.org/10.5194/wes-6-93-2021, https://doi.org/10.5194/wes-6-93-2021, 2021
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Galih Bangga, Thorsten Lutz, and Matthias Arnold
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Koen Boorsma, Florian Wenz, Koert Lindenburg, Mansoor Aman, and Menno Kloosterman
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Wind Energ. Sci., 4, 451–463, https://doi.org/10.5194/wes-4-451-2019, https://doi.org/10.5194/wes-4-451-2019, 2019
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Levin Klein, Jonas Gude, Florian Wenz, Thorsten Lutz, and Ewald Krämer
Wind Energ. Sci., 3, 713–728, https://doi.org/10.5194/wes-3-713-2018, https://doi.org/10.5194/wes-3-713-2018, 2018
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Pascal Weihing, Tim Wegmann, Thorsten Lutz, Ewald Krämer, Timo Kühn, and Andree Altmikus
Wind Energ. Sci., 3, 503–531, https://doi.org/10.5194/wes-3-503-2018, https://doi.org/10.5194/wes-3-503-2018, 2018
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Wind Energ. Sci., 3, 439–460, https://doi.org/10.5194/wes-3-439-2018, https://doi.org/10.5194/wes-3-439-2018, 2018
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Eva Jost, Annette Fischer, Galih Bangga, Thorsten Lutz, and Ewald Krämer
Wind Energ. Sci., 2, 241–256, https://doi.org/10.5194/wes-2-241-2017, https://doi.org/10.5194/wes-2-241-2017, 2017
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Trailing edge flaps applied to the outer part of a wind turbine rotor blade are a very promising concept to reduce fatigue loads as they are able to increase or decrease the airfoil lift for a given angle of attack. They have been widely researched on 2-D airfoils, but only little is known about their aerodynamic characteristics on 3-D wind turbine rotor blades. The present article addresses this issue.
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Wind Energ. Sci., 5, 1191–1210, https://doi.org/10.5194/wes-5-1191-2020, https://doi.org/10.5194/wes-5-1191-2020, 2020
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Before constructing wind farms we need to know how much energy they will produce. This requires knowledge of long-term wind conditions from either measurements or models. At the US East Coast there are few wind measurements and little experience with offshore wind farms. Therefore, we created a satellite-based high-resolution wind resource map to quantify spatial variations in the wind conditions over potential sites for wind farms and found larger variation than modelling suggested.
Anna-Maria Tilg, Charlotte Bay Hasager, Hans-Jürgen Kirtzel, and Poul Hummelshøj
Wind Energ. Sci., 5, 977–981, https://doi.org/10.5194/wes-5-977-2020, https://doi.org/10.5194/wes-5-977-2020, 2020
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Recently, there has been an increased awareness of leading-edge erosion of wind turbine blades. An option to mitigate the erosion at the leading edges is the deceleration of the wind turbine blades during severe precipitation events. This work shows that a vertically pointing radar can be used to nowcast precipitation events with the required spatial and temporal resolution. Furthermore, nowcasting allows a reduction in the rotational speed prior to the impact of precipitation on the blades.
Aurélien Babarit, Gaël Clodic, Simon Delvoye, and Jean-Christophe Gilloteaux
Wind Energ. Sci., 5, 839–853, https://doi.org/10.5194/wes-5-839-2020, https://doi.org/10.5194/wes-5-839-2020, 2020
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This paper addresses the topic of far-offshore wind energy exploitation. Far-offshore wind energy exploitation is not feasible with grid-connected floating wind turbines because grid-connection cost, installation cost and O&M cost would be prohibitive. An enabling technology is the energy ship concept, which is described and modeled in the paper. A design of an energy ship is proposed. It is estimated that it could produce 5 GWh per annum of chemical energy (methanol).
Michael Denis Mifsud, Tonio Sant, and Robert Nicholas Farrugia
Wind Energ. Sci., 5, 601–621, https://doi.org/10.5194/wes-5-601-2020, https://doi.org/10.5194/wes-5-601-2020, 2020
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In offshore wind, it is important to have an accurate wind resource assessment. Measure–correlate–predict (MCP) is a statistical method used in the assessment of the wind resource at a candidate site. Being a statistical method, it is subject to uncertainty, resulting in an uncertainty in the power output from the wind farm. This study involves the use of wind data from the island of Malta and uses a hypothetical wind farm to establish the best MCP methodology for the wind resource assessment.
Aurélien Babarit, Simon Delvoye, Gaël Clodic, and Jean-Christophe Gilloteaux
Wind Energ. Sci. Discuss., https://doi.org/10.5194/wes-2019-101, https://doi.org/10.5194/wes-2019-101, 2020
Revised manuscript not accepted
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This paper addresses the topic of far-offshore wind energy exploitation. Far-offshore wind energy exploitation is not feasible with current technology because grid-connection cost, installation cost and O&M cost would be prohibitive. An enabling technology for far-offshore wind energy is the energy ship concept, which has been described, modelled and analyzed in a companion paper. This paper provides a cost model and cost estimates for an energy system based on the energy ship concept.
Amber Kapoor, Slimane Ouakka, Sanjay R. Arwade, Julie K. Lundquist, Matthew A. Lackner, Andrew T. Myers, Rochelle P. Worsnop, and George H. Bryan
Wind Energ. Sci., 5, 89–104, https://doi.org/10.5194/wes-5-89-2020, https://doi.org/10.5194/wes-5-89-2020, 2020
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Offshore wind energy is a burgeoning area of renewable energy that is at an early stage of development in the United States. Exposure of offshore wind turbines to hurricanes must be assessed and mitigated to ensure the security of the renewable energy supply. This research assesses the impact of hurricane wind fields on the structural response of wind turbines. Such wind fields have characteristics that may pose heretofore unforeseen structural challenges to offshore wind turbines.
Jakob Ilsted Bech, Charlotte Bay Hasager, and Christian Bak
Wind Energ. Sci., 3, 729–748, https://doi.org/10.5194/wes-3-729-2018, https://doi.org/10.5194/wes-3-729-2018, 2018
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Rain erosion on wind turbine blades is a severe challenge for wind energy today. It causes significant losses in power production, and large sums are spent on inspection and repair.
Blade life can be extended, power production increased and maintenance costs reduced by rotor speed reduction at extreme precipitation events. Combining erosion test results, meteorological data and models of blade performance, we show that a turbine control strategy is a promising new weapon against blade erosion.
Tobias Ahsbahs, Merete Badger, Patrick Volker, Kurt S. Hansen, and Charlotte B. Hasager
Wind Energ. Sci., 3, 573–588, https://doi.org/10.5194/wes-3-573-2018, https://doi.org/10.5194/wes-3-573-2018, 2018
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Satellites offer wind measurements offshore and can resolve the wind speed on scales of up to 500 m. To date, this data is not routinely used in the industry for planning wind farms. We show that this data can be used to predict local differences in the mean wind speed around the Anholt offshore wind farm. With satellite data, site-specific wind measurements can be introduced early in the planning phase of an offshore wind farm and help decision makers.
Sebastian Schafhirt and Michael Muskulus
Wind Energ. Sci., 3, 25–41, https://doi.org/10.5194/wes-3-25-2018, https://doi.org/10.5194/wes-3-25-2018, 2018
Lisa Ziegler, Ursula Smolka, Nicolai Cosack, and Michael Muskulus
Wind Energ. Sci., 2, 469–476, https://doi.org/10.5194/wes-2-469-2017, https://doi.org/10.5194/wes-2-469-2017, 2017
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The first larger offshore wind farms are reaching a mature age. Operators have to take actions for monitoring now in order to have accurate knowledge on structural reserves later. This knowledge is important to make decisions on lifetime extension. Many offshore wind turbines have one set of strain gauges already installed at the transition piece. We present a simple and robust method to extrapolate these measurements to other locations of the monopile without need of additional instrumentation.
Antonio Jarquin Laguna
Wind Energ. Sci., 2, 387–402, https://doi.org/10.5194/wes-2-387-2017, https://doi.org/10.5194/wes-2-387-2017, 2017
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This paper presents the idea of centralized electricity production in a wind farm by means of water technology. A new way of generating and transmitting wind energy is explored with no intermediate electrical conversion until the energy has reached the central offshore platform. This work includes the modelling and simulations of a hypothetical hydraulic wind farm, where results indicate good performance despite the turbulent wind conditions and wake effects.
Steffen Aasen, Ana M. Page, Kristoffer Skjolden Skau, and Tor Anders Nygaard
Wind Energ. Sci., 2, 361–376, https://doi.org/10.5194/wes-2-361-2017, https://doi.org/10.5194/wes-2-361-2017, 2017
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The industry standard for analysis of monopile foundations is inaccurate, and alternative models for foundation behavior are needed. This study investigates how four different soil-foundation models affect the fatigue damage of an offshore wind turbine with a monopile foundation. Stiffness and damping properties have a noticeable effect, in particular for idling cases. At mud-line, accumulated fatigue damage varied up to 22 % depending on the foundation model used.
Cited articles
Bayati, I., Belloli, M., Bernini, L., and Zasso, A.: Wind tunnel validation of AeroDyn within LIFES50+ project: imposed Surge and Pitch tests, J. Phys.:
Conf. Ser., 753, 092001, https://doi.org/10.1088/1742-6596/753/9/092001, 2016. a
Bayati, I., Belloli, M., Bernini, L., Giberti, H., and Zasso, A.: Scale model
technology for floating offshore wind turbines, IET Renew. Power Gener., 11,
1120–1126, https://doi.org/10.1049/iet-rpg.2016.0956, 2017a. a, b, c
Bayati, I., Belloli, M., Bernini, L., and Zasso, A.: Wind Tunnel Wake
Measurements of Floating Offshore Wind Turbines, Energy Procedia, 137, 214–222, https://doi.org/10.1016/j.egypro.2017.10.375, 2017b. a, b
Bayati, I., Belloli, M., Bernini, L., and Zasso, A.: Aerodynamic design
methodology for wind tunnel tests of wind turbine rotors, Renew. Energy, 167, 1–12, https://doi.org/10.1016/j.jweia.2017.05.004, 2017c. a, b
Bayati, I., Belloli, M., Bernini, L., Boldrin, D. M., Boorsma, K., Caboni, M., Cormier, M., Mikkelsen, R., Lutz, T., and Zasso, A.: UNAFLOW project:
UNsteady Aerodynamics of FLOating Wind turbines, J. Phys.: Conf. Ser., 1037,
072037, https://doi.org/10.1088/1742-6596/1037/7/072037, 2018a. a
Bayati, I., Bernini, L., Zanotti, A., Belloli, M., and Zasso, A.: Experimental investigation of the unsteady aerodynamics of FOWT through PIV and hot-wire wake measurements, J. Phys.: Conf. Ser., 1037, 052024, https://doi.org/10.1088/1742-6596/1037/5/052024, 2018b. a
Boorsma, K., Grasso, F., and Holierhoek, J. G.: Enhanced approach for
simulation of rotor aerodynamic loads, Report EC N-M–12-003, ECN,
in: EWEA Offshore 2011, 29 November–1 December 2011, Amsterdam, 2011. a
Boorsma, K., Hartvelt, M., and Orsi, L. M.: Application of the lifting line
vortex wake method to dynamic load case simulations, J. Phys.: Conf. Ser.,
753, 022030, https://doi.org/10.1088/1742-6596/753/2/022030, 2016. a
Boorsma, K., Wenz, F., Lindenburg, K., Aman, M., and Kloosterman, M.: Validation and accommodation of vortex wake codes for wind turbine design load calculations, Wind Energ. Sci., 5, 699–719, https://doi.org/10.5194/wes-5-699-2020, 2020. a
Cormier, M., Caboni, M., Lutz, T., Boorsma, K., and Krämer, E.: Numerical
analysis of unsteady aerodynamics of floating offshore wind turbines, J.
Phys.: Conf. Ser., 1037, 072048, https://doi.org/10.1088/1742-6596/1037/7/072048, 2018. a, b
de Vaal, J. B., Hansen, M. O. L., and Moan, T.: Effect of wind turbine surge
motion on rotor thrust and induced velocity, Wind Energ., 17, 105–121,
https://doi.org/10.1002/we.1562, 2014. a, b, c, d
Farrugia, R., Sant, T., and Micallef, D.: Investigating the aerodynamic
performance of a model offshore floating wind turbine, Renew. Energy, 70,
24–30, https://doi.org/10.1016/j.renene.2013.12.043, 2014. a
Farrugia, R., Sant, T., and Micallef, D.: A study on the aerodynamics of a
floating wind turbine rotor, Renew. Energy, 86, 770–784,
https://doi.org/10.1016/j.renene.2015.08.063, 2016. a, b, c
Goupee, J. A., Kimball, R. W., and Dagher, H. J.: Experimental observations of active blade pitch and generator control influence on floating wind turbine response, Renew. Energy, 104, 9–19, https://doi.org/10.1016/j.renene.2016.11.062, 2017. a, b
Jameson, A., Schmidt, W., and Turkel, E.: Numerical solution of the Euler
equations by finite volume methods using Runge Kutta time stepping schemes,
in: 14th fluid and plasma dynamics conference, Palo Alto, CA, USA, p. 1259, 1981. a
Khosravi, M., Sarkar, P., and Hu, H.: An Experimental Investigation on the
Performance and the Wake Characteristics of a Wind Turbine Subjected to Surge
Motion, in: 33rd Wind Energy Symposium 2015/AIAA SciTech Forum 2015, AIAA 2015-1207, Kissimmee, Florida, https://doi.org/10.2514/6.2015-1207, 2015. a
Kowarsch, U., Keßler, M., and Krämer, E.: High order CFD-simulation of the rotor-fuselage interaction, in: 44th European Rotorcraft Forum, Moscow, Russia, 2013. a
Kroll, N. and Faßbender, J. K.: MEGAFLOW – Numerical Flow Simulation for
Aircraft Design, Springer Verlag, Braunschweig, Germany, 2005. a
Lindenburg, C. and Schepers, J. G.: Phatas-IV Aeroelastic Modelling, Release `DEC-1999' and `NOV-2000', Report ECN-CX–00-027, ECN, Petten, the Netherlands, 2000. a
Madsen, F. J., Nielsen, T. R. L., Kima, T., Bredmose, H., Pegalajar-Jurado, A., Mikkelsen, R. F., Lomholt, A. K., Borg, M., Mirzaei, M., and Shin, P.:
Experimental analysis of the scaled DTU10MW TLP floating wind turbine with
different control strategies, Renew. Energy, 155, 330–346,
https://doi.org/10.1016/j.renene.2020.03.145, 2020. a, b, c
Mantha, D., Schlipf, M., Cordle, A., Pereira, R., and Jonkman, J.: Challenges
in Simulation of Aerodynamics, Hydrodynamics, and Mooring-Line Dynamics of
Floating Offshore Wind Turbines, in: 21st Offshore and Polar Engineering
Conference, Maui, Hawaii, 2011. a
Melani, P. F., Schito, P., and Persico, G. B. A.: Experimental Assessment of an Actuator-Line Simulation Tool for VAWTs, in: Wind Energy Exploitation in
Urban Environment. TUrbWind 2018, edited by: Battisti, L., Springer International Publishing, Milan, Italy, 177–200, https://doi.org/10.1007/978-3-030-13531-7_11, 2019. a
Menter, F. R.: Two-equation eddy-viscosity turbulence models for engineering
applications, AIAA J., 32, 1598–1605, 1994. a
Micallef, D. and Sant, T.: Loading effects on floating offshore horizontal axis wind turbines in surge motion, Renew. Energy, 83, 737–748,
https://doi.org/10.1016/j.renene.2015.05.016, 2015. a, b, c, d
Nielsen, F. G., Hanson, T. D., and Skaare, G.: Integrated dynamic analysis of
floating offshore wind turbines, in: Proceedings of the 25th International
Conference on Offshore Mechanics and Arctic Engineering, Hamburg, Germany, 671–679, 2006. a
Øye, S.: A simple vortex model of a turbine rotor, in: Proceedings of the
third IEA symposium on the aerodynamics of wind turbines, Harwell, UK, 1–15, 1990. a
Pedersen, M. D.: Stabilization of Floating Wind Turbines, PhD thesis, NTNU,
Trondheim, Denmark, 2017. a
Ren, N., Li, Y., and Ou, J.: Coupled wind-wave time domain analysis of floating offshore wind turbine based on Computational Fluid Dynamics method, J. Renew. Sustain. Ener., 6, 023106, https://doi.org/10.1063/1.4870988, 2014. a
Sant, T., Bonnici, D., Farrugia, R., and Micallef, D.: Measurements and
modelling of the power performance of a model floating wind turbine under
controlled conditions, Wind Energ., 18, 811–834, https://doi.org/10.1002/we.1730, 2015. a
Sarlak, H., Meneveau, C., and Sørensen, J. N.: Role of subgrid-scale modeling
in large eddy simulation of wind turbine wake interactions, Renew. Energy,
77, 386–399, https://doi.org/10.1016/j.renene.2014.12.036, 2015.
a
Sayed, M., Lutz, T., and Krämer, E.: Aerodynamic investigation of flow over a multi-megawatt slender bladed horizontal-axis wind turbine, in: Renewable Energies Offshore, Lisbon, Portugal, 773–780, 2015. a
Schito, P.: Large Eddy Simulation of wind turbines: interaction with turbulent flow, PhD thesis, Politecnico di Milano, Milan, Italy, 2011. a
Schito, P. and Zasso, A.: Actuator forces in CFD: RANS and LES modeling in
OpenFOAM, J. Phys.: Conf. Ser., 524, 012160, https://doi.org/10.1088/1742-6596/524/1/012160, 2014. a, b
Schito, P., Bayati, I., Belloli, M., Bernini, L., Dossena, V., and Zasso, A.:
Numerical Wind Tunnel Tests of an Open Data IPC-VAWT, in: Wind Energy
Exploitation in Urban Environment. TUrbWind 2017, edited by: Battisti, L. and
Ricci, M.,Springer, Cham, Milan, Italy, 113–122, https://doi.org/10.1007/978-3-319-74944-0_8, 2018. a
Sebastian, T. and Lackner, M. A.: Analysis of the Induction and Wake Evolution of an Offshore Floating Wind Turbine, Energies, 5, 968–1000,
https://doi.org/10.3390/en5040968, 2012. a
Sebastian, T. and Lackner, M. A.: Characterization of the unsteady aerodynamics of offshore floating wind turbines, Wind Energ., 16, 339–352,
https://doi.org/10.1002/we.545, 2013. a
Snel, H.: Heuristic modelling of dynamic stall characteristics, in: Conference proceedings European Wind Energy Conference, Dublin, Ireland, 429–433, 1997. a
Snel, H. and Schepers, J. G.: JOULE1: Joint investigation of Dynamic Inflow
Effects and Implementation of an Engineering Model, Report ECN-C–94-107, ECN, Petten, the Netherlands, 1994. a
Snel, H., Houwink, R., van Bussel, G. J. W., and Bruining, A.: Sectional
prediction of 3D effects for stalled flow on rotating blades and comparison
with measurements, in: Proc. European Community Wind Energy Conference,
Travemünde, Germany, 1993. a
Tran, T. T. and Kim, D. H.: A CFD study into the influence of unsteady
aerodynamic interference on wind turbine surge motion, Renew. Energy, 90,
204–228, https://doi.org/10.1016/j.renene.2015.12.013, 2016. a, b
Short summary
This work characterizes the unsteady aerodynamic response of a scaled version of a 10 MW floating wind turbine subjected to an imposed platform motion. The focus has been put on the simple yet significant motion along the wind's direction (surge). For this purpose, different state-of-the-art aerodynamic codes have been used, validating the outcomes with detailed wind tunnel experiments. This paper sheds light on floating-turbine unsteady aerodynamics for a more conscious controller design.
This work characterizes the unsteady aerodynamic response of a scaled version of a 10 MW...
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