This paper employs a dynamic and sliding mesh in the simulation of both uncoupled and coupled surge and roll motions of a tidal stream turbine, utilizing a modified actuator-line method. The modification involves the relocation of blade elements in relation to the grid. Detailed analyses are conducted on the Cp and Cz variations in surge, roll, and coupled motions at various frequencies and amplitudes. It is observed that changing the amplitude and frequency of surge and roll motions both impacts the amplitude of Cp and Cz. Interestingly, the Cp and Cz variations in surge motion are inversely proportional to velocity variations, while they are directly proportional in roll motion. The influence of the surge motion on Cp Cz plays a major role, while the addition of the roll motion increases the mean values of Cp and Cz. Due to the combination of the wake characteristics of both surge and roll, the coupled motion wake exhibits a contraction–expansion oscillation pattern. In a coupled motion with equal periods, the ring and strip tail vortex characteristics of both motions are apparent. A surge period increment diminishes the surge's tail vortex characteristic, whereas an increase in the roll period gradually erodes the roll's tail vortex characteristic. The coefficient variation of the tangential and normal forces (cn, ct) in combined motion mirror that of surge motion, presenting a convex table per surge cycle with depressions at the 1/2T and 1T points. The peak of cn and ct in surge motion are approximately 0.28 and 0.03, respectively, while in roll motion, they are around 0.261 and 0.025. The exploration of cyclic stress impacts on the turbine, and the potential instability on the platform could be valuable directions for future research.
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July 2023
Research Article|
July 12 2023
Effects of surge and roll motion on a floating tidal turbine using the actuator-line method
Special Collection:
Recent Advances in Marine Hydrodynamics
Li Chengyi (李城易)
;
Li Chengyi (李城易)
(Conceptualization, Investigation, Methodology, Validation, Writing – original draft)
1
College of Water Conservancy and Hydropower Engineering, Hohai University
, Nanjing 210098, People's Republic of China
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Zhang Yuquan (张玉全)
;
Zhang Yuquan (张玉全)
a)
(Data curation, Resources, Writing – review & editing)
1
College of Water Conservancy and Hydropower Engineering, Hohai University
, Nanjing 210098, People's Republic of China
2
College of Energy and Electrical Engineering, Hohai University
, Nanjing 210098, People's Republic of China
a)Author to whom correspondence should be addressed: [email protected]
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Zheng Yuan (郑源);
Zheng Yuan (郑源)
(Data curation, Funding acquisition, Resources, Writing – review & editing)
1
College of Water Conservancy and Hydropower Engineering, Hohai University
, Nanjing 210098, People's Republic of China
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Qian Yaoru (钱耀如)
;
Qian Yaoru (钱耀如)
(Methodology, Resources)
3
Nanjing Institute of Technology
, Nanjing 211167, People's Republic of China
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Hua Hongchang (化洪昌)
;
Hua Hongchang (化洪昌)
(Resources, Validation)
2
College of Energy and Electrical Engineering, Hohai University
, Nanjing 210098, People's Republic of China
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Ren Shenming (任慎明);
Ren Shenming (任慎明)
(Data curation, Validation)
2
College of Energy and Electrical Engineering, Hohai University
, Nanjing 210098, People's Republic of China
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Emmanuel Fernandez-Rodriguez
Emmanuel Fernandez-Rodriguez
(Validation, Writing – review & editing)
4
Technological Institute of Merida
, Technological Avenue, Merida 97118, Mexico
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Zheng Yuan (郑源)
1
Ren Shenming (任慎明)
2
Emmanuel Fernandez-Rodriguez
4
1
College of Water Conservancy and Hydropower Engineering, Hohai University
, Nanjing 210098, People's Republic of China
2
College of Energy and Electrical Engineering, Hohai University
, Nanjing 210098, People's Republic of China
3
Nanjing Institute of Technology
, Nanjing 211167, People's Republic of China
4
Technological Institute of Merida
, Technological Avenue, Merida 97118, Mexico
a)Author to whom correspondence should be addressed: [email protected]
Note: This paper is part of the special topic, Recent Advances in Marine Hydrodynamics.
Physics of Fluids 35, 075125 (2023)
Article history
Received:
April 13 2023
Accepted:
June 22 2023
Citation
Chengyi Li, Yuquan Zhang, Yuan Zheng, Yaoru Qian, Hongchang Hua, Shenming Ren, Emmanuel Fernandez-Rodriguez; Effects of surge and roll motion on a floating tidal turbine using the actuator-line method. Physics of Fluids 1 July 2023; 35 (7): 075125. https://doi.org/10.1063/5.0154097
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