Browsing by Author "Ringwood, John V."
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Item Control co-design for wave energy farms: Optimisation of array layout and mooring configuration in a realistic wave climate(2024-06) Peña-Sanchez, Yerai; García-Violini, Demián; Penalba, Markel; Zarketa-Astigarraga, Ander; Ferri, Francesco; Nava, Vincenzo; Ringwood, John V.; RENOVABLES OFFSHOREThis paper presents a novel Control Co-Design (CCD) methodology aimed at economically optimising the layout of wave energy converter (WEC) arrays. CCD ensures the synergy of optimised WEC and array parameters with the final control strategy, resulting in a comprehensive and efficient design of the array. By integrating a spectral-based control strategy into the array layout design, this study pursues the twin objectives of maximising energy absorption while reducing costs. To prove the performance of the proposed CCD methodology, an application case is proposed where the inter-device distance, alignment, and mooring configuration of a five-device array, considering realistic wave scenarios, are optimised. Energy capture and system cost evaluations are conducted, with results emphasising the significance of incorporating advanced control strategies in the design phase to improve energy absorption and reduce costs. With the application case, the study demonstrates that the optimal layout of a WEC array considering economic factors may differ from the optimal from purely technical factors, such as energy absorption, in the analysed case.Item Ocean Energy Systems Wave Energy Modelling Task: Modelling, Verification and Validation of Wave Energy Converters: Modelling, verification and validation ofwave energy converters(2019) Wendt, Fabian; Nielsen, Kim; Yu, Yi-Hsiang; Bingham, Harry; Eskilsson, Claes; Kramer, Morten; Babarit, Aurelien; Bunnik, Tim; Costello, Ronan; Crowley, Sarah; Gendron, Bengamin; Giorgi, Giuseppe; Girardin, Samuel; Greaves, Devorah; Heras, Pilar; Hoffman, Johan; Islam, Hafizul; Jakobsen, Ken-Robert; Janson, Carl-Erik; Jansson, Johan; Kim, Hyun Yul; Kurniawan, Adi; Leoni, Massimiliano; Mathai, Thomas; Nam, Bo-Woo; Park, Sewan; Rajagopalan, Krishnakumar; Ransley, Edward; Read, Robert; Ringwood, John V.; Rodrigues, Jose Miguel; Rosenthal, Benjamin; Roy, Andre; Ruehl, Kelley; Schofield, Paul; Sheng, Wanan; Shiri, Abolfazl; Thomas, Sarah; Touzon, Imanol; Yasutaka, Imai; Giorgi, Simone; Kim, Jeong-Seok; Kim, Kyong-Hwan; Gendron, Benjamin; Greaves, Deborah; Schofield, Paul; Tecnalia Research & InnovationThe International Energy Agency Technology Collaboration Programme for Ocean Energy Systems (OES) initiated the OES Wave Energy Conversion Modelling Task, which focused on the verification and validation of numerical models for simulating wave energy converters (WECs). The long-term goal is to assess the accuracy of and establish confidence in the use of numerical models used in design as well as power performance assessment of WECs. To establish this confidence, the authors used different existing computational modelling tools to simulate given tasks to identify uncertainties related to simulation methodologies: (i) linear potential flow methods; (ii) weakly nonlinear Froude–Krylov methods; and (iii) fully nonlinear methods (fully nonlinear potential flow and Navier–Stokes models). This article summarizes the code-to-code task and code-to-experiment task that have been performed so far in this project, with a focus on investigating the impact of different levels of nonlinearities in the numerical models. Two different WECs were studied and simulated. The first was a heaving semi-submerged sphere, where free-decay tests and both regular and irregular wave cases were investigated in a code-to-code comparison. The second case was a heaving float corresponding to a physical model tested in a wave tank. We considered radiation, diffraction, and regular wave cases and compared quantities, such as the WEC motion, power output and hydrodynamic loading.