Effect of Difference-frequency Forces on the Dynamics of a Semi-submersible Type FVAWT in Misaligned Wave-wind Condition

Kai Wang; Zhengshun  Cheng; Torgeir Moan; Martin Otto Laver Hansen

Effect of Difference-frequency Forces on the Dynamics of a Semi-submersible Type FVAWT in Misaligned Wave-wind Condition

Kai Wang, Zhengshun Cheng, Torgeir Moan, Martin Otto Laver Hansen

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

Abstract

With increasing interests in the development of offshore floating vertical axis wind turbines (FVAWTs), a large amount of studies on the FVAWTs have been conducted. This paper focuses on evaluating the effect of second-order difference-frequency force on the dynamics of a 5 MW FVAWT in misaligned wave-wind condition. The studied FVAWT is composed of a 5 MW Darrieus rotor, a semi-submersible floater and a catenary mooring system. Fully coupled nonlinear time domain simulations were conducted using the state-of-art code Simo- Riflex-DMS. Several misaligned wave-wind conditions were selected to investigate the global dynamic responses of the FVAWT, such as the platform motions, structural responses and mooring line tensions. It has been found that the wave-wind misalignment does not significantly affect the mean values of the global responses since the global responses are primarily wind-induced. And the second order differencefrequency force can contribute to a slightly larger mean value. The standard deviations and maximum values of the global responses are slightly more sensitive to the wave-wind misalignment and the second order difference-frequency force, especially at high significant wave height conditions.

Original language	English
Title of host publication	Proceedings of the Twenty-fifth (2015) International Ocean and Polar Engineering Conference
Publisher	International Society of Offshore and Polar Engineers
Publication date	2015
Pages	517-524
ISBN (Print)	978-1-880653-89-0
Publication status	Published - 2015
Event	25th International Ocean and Polar Engineering Conference - Kona, United States Duration: 21 Jun 2015 → 26 Jun 2015 http://www.isope.org/conferences/conferences.htm

Conference

Conference	25th International Ocean and Polar Engineering Conference
Country	United States
City	Kona
Period	21/06/2015 → 26/06/2015
Internet address	http://www.isope.org/conferences/conferences.htm

Series	Proceedings of the International Offshore and Polar Engineering Conference
ISSN	1098-6189

Keywords

Floating vertical axis wind turbine
Difference-frequency force
Wave-wind misalignment
Dynamic responses

Cite this

Wang, K., Cheng, Z., Moan, T., & Hansen, M. O. L. (2015). Effect of Difference-frequency Forces on the Dynamics of a Semi-submersible Type FVAWT in Misaligned Wave-wind Condition. In Proceedings of the Twenty-fifth (2015) International Ocean and Polar Engineering Conference (pp. 517-524). International Society of Offshore and Polar Engineers. Proceedings of the International Offshore and Polar Engineering Conference

Wang, Kai ; Cheng, Zhengshun ; Moan, Torgeir ; Hansen, Martin Otto Laver. / Effect of Difference-frequency Forces on the Dynamics of a Semi-submersible Type FVAWT in Misaligned Wave-wind Condition. Proceedings of the Twenty-fifth (2015) International Ocean and Polar Engineering Conference. International Society of Offshore and Polar Engineers, 2015. pp. 517-524 (Proceedings of the International Offshore and Polar Engineering Conference).

@inproceedings{244fac9bee5a438b8ac0ecb8b086bf3c,

title = "Effect of Difference-frequency Forces on the Dynamics of a Semi-submersible Type FVAWT in Misaligned Wave-wind Condition",

abstract = "With increasing interests in the development of offshore floating vertical axis wind turbines (FVAWTs), a large amount of studies on the FVAWTs have been conducted. This paper focuses on evaluating the effect of second-order difference-frequency force on the dynamics of a 5 MW FVAWT in misaligned wave-wind condition. The studied FVAWT is composed of a 5 MW Darrieus rotor, a semi-submersible floater and a catenary mooring system. Fully coupled nonlinear time domain simulations were conducted using the state-of-art code Simo- Riflex-DMS. Several misaligned wave-wind conditions were selected to investigate the global dynamic responses of the FVAWT, such as the platform motions, structural responses and mooring line tensions. It has been found that the wave-wind misalignment does not significantly affect the mean values of the global responses since the global responses are primarily wind-induced. And the second order differencefrequency force can contribute to a slightly larger mean value. The standard deviations and maximum values of the global responses are slightly more sensitive to the wave-wind misalignment and the second order difference-frequency force, especially at high significant wave height conditions.",

keywords = "Floating vertical axis wind turbine, Difference-frequency force, Wave-wind misalignment, Dynamic responses",

author = "Kai Wang and Zhengshun Cheng and Torgeir Moan and Hansen, {Martin Otto Laver}",

year = "2015",

language = "English",

isbn = "978-1-880653-89-0",

series = "Proceedings of the International Offshore and Polar Engineering Conference",

publisher = "International Society of Offshore and Polar Engineers",

pages = "517--524",

booktitle = "Proceedings of the Twenty-fifth (2015) International Ocean and Polar Engineering Conference",

note = "25th International Ocean and Polar Engineering Conference, ISOPE-2015 ; Conference date: 21-06-2015 Through 26-06-2015",

url = "http://www.isope.org/conferences/conferences.htm",

}

Wang, K, Cheng, Z, Moan, T & Hansen, MOL 2015, Effect of Difference-frequency Forces on the Dynamics of a Semi-submersible Type FVAWT in Misaligned Wave-wind Condition. in Proceedings of the Twenty-fifth (2015) International Ocean and Polar Engineering Conference. International Society of Offshore and Polar Engineers, Proceedings of the International Offshore and Polar Engineering Conference, pp. 517-524, 25th International Ocean and Polar Engineering Conference, Kona, United States, 21/06/2015.

Effect of Difference-frequency Forces on the Dynamics of a Semi-submersible Type FVAWT in Misaligned Wave-wind Condition. / Wang, Kai; Cheng, Zhengshun ; Moan, Torgeir; Hansen, Martin Otto Laver.

Proceedings of the Twenty-fifth (2015) International Ocean and Polar Engineering Conference. International Society of Offshore and Polar Engineers, 2015. p. 517-524 (Proceedings of the International Offshore and Polar Engineering Conference).

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

TY - GEN

T1 - Effect of Difference-frequency Forces on the Dynamics of a Semi-submersible Type FVAWT in Misaligned Wave-wind Condition

AU - Wang, Kai

AU - Cheng, Zhengshun

AU - Moan, Torgeir

AU - Hansen, Martin Otto Laver

PY - 2015

Y1 - 2015

N2 - With increasing interests in the development of offshore floating vertical axis wind turbines (FVAWTs), a large amount of studies on the FVAWTs have been conducted. This paper focuses on evaluating the effect of second-order difference-frequency force on the dynamics of a 5 MW FVAWT in misaligned wave-wind condition. The studied FVAWT is composed of a 5 MW Darrieus rotor, a semi-submersible floater and a catenary mooring system. Fully coupled nonlinear time domain simulations were conducted using the state-of-art code Simo- Riflex-DMS. Several misaligned wave-wind conditions were selected to investigate the global dynamic responses of the FVAWT, such as the platform motions, structural responses and mooring line tensions. It has been found that the wave-wind misalignment does not significantly affect the mean values of the global responses since the global responses are primarily wind-induced. And the second order differencefrequency force can contribute to a slightly larger mean value. The standard deviations and maximum values of the global responses are slightly more sensitive to the wave-wind misalignment and the second order difference-frequency force, especially at high significant wave height conditions.

AB - With increasing interests in the development of offshore floating vertical axis wind turbines (FVAWTs), a large amount of studies on the FVAWTs have been conducted. This paper focuses on evaluating the effect of second-order difference-frequency force on the dynamics of a 5 MW FVAWT in misaligned wave-wind condition. The studied FVAWT is composed of a 5 MW Darrieus rotor, a semi-submersible floater and a catenary mooring system. Fully coupled nonlinear time domain simulations were conducted using the state-of-art code Simo- Riflex-DMS. Several misaligned wave-wind conditions were selected to investigate the global dynamic responses of the FVAWT, such as the platform motions, structural responses and mooring line tensions. It has been found that the wave-wind misalignment does not significantly affect the mean values of the global responses since the global responses are primarily wind-induced. And the second order differencefrequency force can contribute to a slightly larger mean value. The standard deviations and maximum values of the global responses are slightly more sensitive to the wave-wind misalignment and the second order difference-frequency force, especially at high significant wave height conditions.

KW - Floating vertical axis wind turbine

KW - Difference-frequency force

KW - Wave-wind misalignment

KW - Dynamic responses

M3 - Article in proceedings

SN - 978-1-880653-89-0

T3 - Proceedings of the International Offshore and Polar Engineering Conference

SP - 517

EP - 524

BT - Proceedings of the Twenty-fifth (2015) International Ocean and Polar Engineering Conference

PB - International Society of Offshore and Polar Engineers

T2 - 25th International Ocean and Polar Engineering Conference

Y2 - 21 June 2015 through 26 June 2015

ER -

Wang K, Cheng Z, Moan T, Hansen MOL. Effect of Difference-frequency Forces on the Dynamics of a Semi-submersible Type FVAWT in Misaligned Wave-wind Condition. In Proceedings of the Twenty-fifth (2015) International Ocean and Polar Engineering Conference. International Society of Offshore and Polar Engineers. 2015. p. 517-524. (Proceedings of the International Offshore and Polar Engineering Conference).