Thesis

Hydrodynamics and energy capture characteristics of floating wave-energy harvesting platforms

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Awarding institution
  • University of Strathclyde
Date of award
  • 2026
Thesis identifier
  • T18102
Person Identifier (Local)
  • 202250563
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Department, School or Faculty
Abstract
  • In the context of escalating global climate change, many countries have proposed carbon neutrality targets to reduce greenhouse gas emissions and promote a transition toward a low-carbon and sustainable energy structure. In this regard, the development and utilization of renewable energy sources have become a critical pathway, with marine energy gaining significant attention due to its abundant reserves and minimal environmental impact. Compared with other types of marine energy, wave energy is featured for greater stability, high energy density, and reduced susceptibility to diurnal and seasonal variations, making it a vital component of the marine renewable energy sector. However, standalone wave energy devices still face challenges related to energy capture efficiency, structural stability, and economic viability, which limit their large-scale commercial deployment. In recent years, the integration of wave energy converters (WECs) with some floating offshore structures has emerged as a promising solution. Such integrated systems not only enhance energy utilization efficiency but also enable infrastructure sharing, reducing construction and operational costs. To promote the development of wave energy, this thesis proposes a new floating wave-energy harvesting platform concept, which consists of a SPIC concept semi-submersible floating platform and multiple point-absorber WECs. Extensive studies about wave-energy capture platforms have been conducted on the effects of WEC configurations, mooring systems, and PTO devices on system performance under regular or long-crested wave conditions. However, few works have considered wave–current interaction (WCI) and wave directional spreading, despite the fact that these environmental factors are commonly encountered in realistic sea states. Exploring their influences on system performance is of great significance for the design and assessment of wave-energy capture platforms. Accordingly, this paper primarily investigates the dynamic responses and energy capture performance of the proposed wave-energy capture platform under WCI, short-crested waves, and their combined effects. To evaluate the effects of WCI and wave directional distribution, as well as to facilitate future studies on more complex multi-body connected systems, this work develops a coupled time domain hydro-connection-mooring analysis tool based on potential flow theory, the Lagrange multiplier method, and the lumped mass method. The results demonstrate that the wave directional spreading and WCI significantly affect platform motions, mooring loads, and wave-energy conversion efficiency, highlighting the necessity of considering these two environmental factors in realistic ocean conditions for the design and assessment of wave-energy harvesting platforms.
Advisor / supervisor
  • Yuan, Zhiming
Resource Type
DOI

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