Validation of a control-oriented point vortex model for a cyclorotor-based wave energy device

Ermakov, Andrei; Thiebaut, Florent; Payne, Grégory S.; Ringwood, John V.

doi:10.1016/j.jfluidstructs.2023.103875

Cited by 9 publications

(5 citation statements)

References 19 publications

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“…The hydrodynamic forces on the hydrofoil of the cyclorotor are modelled by representing the foil as a point vortex under a free surface. This representation has been used in the literature of lift based WECs to model free surface elevation [3], [7], [12] and recently, to model loads on the hydrofoils of the cyclorotor [4], [5], [13].…”

Section: Hydrodynamic and Structural Modellingmentioning

confidence: 99%

A probabilistic framework for fatigue damage of lift based wave energy converters

Arredondo-Galeana,

Lamont-Kane,

Shi

et al. 2023

Proc. EWTEC

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Wave cycloidal rotors are lift based wave energy devices that have shown great potential to harness the energy of the waves through the use of submerged hydrofoils. Although the lift force of the foils can be controlled passively or actively to maximise power extraction, the foils of the rotor are subject to variable loading which can expose these components to premature mechanical failure. Therefore, it is important to develop novel fatigue analysis tools that help predicting the lifetime of this type of lift based devices. In this paper, we test the hypothesis that when cyclorotor operates at constant rotational velocity in irregular waves, the fatigue damage of the hydrofoil stress hot spot can be computed through a probabilistic approach. We compare our results to the fatigue damage computed with well established deterministic methods. We find that for both narrow and broad band stress energy spectra, the probabilistic method works well at high probability sea states, when the range of stresses does not exceed the inflection point of a double slope SN curve. This is a promising outlook since it confirms that the fatigue damage of these versatile lift based wave devices can be treated in a similar fashion to the fatigue damage of conventional offshore structures.

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Section: Hydrodynamic and Structural Modellingmentioning

confidence: 99%

A probabilistic framework for fatigue damage of lift based wave energy converters

Arredondo-Galeana,

Lamont-Kane,

Shi

et al. 2023

Proc. EWTEC

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“…Five different selection criteria relevant to lift-based WECs are selected, namely structural reliability, hydrodynamic efficiency, offshore maintainability, manufacturing costs and environmental impact. These criteria are key and were found to be relevant to increase the TRL of lift-based WECs based on the findings of the LiftWEC consortium [5,6,[33][34][35], a three-year Horizon 2020 research project, which concluded in the first quarter of 2023 [36]. Subsequently, a material decision matrix is constructed and assessed using fuzzy logic and TOPSIS.…”

Section: Materials Selection Frameworkmentioning

confidence: 99%

“…For the case of lift-based WECs, previous studies have considered offshore steel and composites as suitable material candidates [4][5][6]12]. However, no comprehensive environmental justification has been provided.…”

Section: Environmental Impact Manufacturability and Recyclabilitymentioning

confidence: 99%

“…Among the candidate wave energy converters (WECs), lift-based WECs have shown great potential to become competitive in the offshore market due to their submerged mode of operation and ability to stall in storm conditions passively. Hence, the load alleviation capabilities of these devices make them strong contenders for commercialisation [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Material Selection Framework for Lift-Based Wave Energy Converters Using Fuzzy TOPSIS

Arredondo-Galeana,

Yeter,

Abad

et al. 2023

Energies

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Material selection is a crucial aspect in the design of reliable, efficient and long-lasting wave energy converters (WECs). However, to date, the development of tailored methodologies applied to the material selection of WECs remains vastly unexplored. In this paper, a material selection framework for the case of lift-based WECs is developed. The application of the methodology is demonstrated with the hydrofoils of the device. Offshore steel, high-strength offshore steel, aluminium alloys, and carbon- and glass-fibre-reinforced composites are considered and evaluated subject to relevant criteria for wave energy converters, namely structural reliability, hydrodynamic efficiency, offshore maintainability, total manufacturing cost and environmental impact. Candidate materials are assessed via fuzzy TOPSIS for three scenarios of the life cycle of the WEC: conceptual, commercial and future projection stages. Results show that the choice of optimal materials could change from present to future and that multi-criteria decision-making tools aided by a fuzzy approach are useful design tools for novel WECs when field data are scarce. Hence, methodologies such as the ones presented in this work can help in reducing the probability of mechanical failures of emerging WEC technology.

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Section: Materials Selection Frameworkmentioning

confidence: 99%

Material Selection Framework for Lift-Based Wave Energy Converters Using Fuzzy Topsis

Arredondo-Galeana

Yeter

Abad

et al. 2023

Preprint

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Validation of a control-oriented point vortex model for a cyclorotor-based wave energy device

Cited by 9 publications

References 19 publications

A probabilistic framework for fatigue damage of lift based wave energy converters

A probabilistic framework for fatigue damage of lift based wave energy converters

Material Selection Framework for Lift-Based Wave Energy Converters Using Fuzzy TOPSIS

Material Selection Framework for Lift-Based Wave Energy Converters Using Fuzzy Topsis

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