Numerical prediction of the surge-induced response of a tidal twin-turbine system

Yuquan Zhang, Bin Peng, Feng Chen, Wei Zang, Fernandez-Rodriguez,, Desheng Zhang and Wanqiang Zhu

Energy, 2025, vol. 330, issue C

Abstract: This paper investigates numerically the transient and time-averaged wake characteristics of a floating twin-turbine system, under surge motion only. As the turbine surges, its power and thrust fluctuate with a frequency equal to the surge's. The maximum and minimum instantaneous performance associates with the induced surge velocity, thereby inducing fatigue damage. Without surge, the wake per rotor resembles a tear-drop shape. However, the wake becomes violent with surge, leading to instabilities and breakdown of the tip vortexes. The wake characteristics are more sensitive to the surge period rather than amplitude changes. As an example, the wake elongates from x/D = 4 to x/D = 8 by increasing the period from 3s to 12s. Therefore, a surge motion with a lower period results in a more distorted and erratic wake configuration but with faster velocity recovery. These findings, whilst limited to one degree of motion, will be constructive in solving the dynamic response of adjacent floating turbines.

Keywords: Surge; Floating tidal stream turbines; Computational fluid dynamics; Power and thrust response (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:330:y:2025:i:c:s0360544225023904

DOI: 10.1016/j.energy.2025.136748

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