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Item DESIGN TOOLS FOR OFFSHORE RENEWABLE ENERGY(2020) VILLATE MARTINEZ, JOSE LUIS; RUIZ MINGUELA, PABLO; PEREZ MORAN, GERMAN; NAVA, VINCENZO; ROBLES, EIDER; Tecnalia Research & InnovationThe crisis caused by the COVID-19 has awakened the fear of forgetting the fight against Climate Change coming up with a number of initiatives demanding to accelerate the European Green Deal, as the best way out of the crisis. Offshore renewable energy sources, including offshore wind, wave power and tidal streams, might play a crucial role in meeting low-carbon energy scenarios, which is one of the six key principles of the Green Recovery, contributing at the same time to economic growth and job creation. However, continuous cost reduction is needed to achieve more efficient and competitive technologies in comparison to other energy sources. Design tools can help to accelerate cost reduction in early stages of technology development or deployment project planning. This article shows some examples of design tools developed within four European funded R&D projects: • DTOcean and DTOceanPlus provide advanced design tools for ocean energy systems innovation, development and deployment • LIFES50+ proves cost effective technology for floating substructures for 10MW wind turbines at water depths greater than 50 m • OPERA collects, analyses and shares open-sea operating data and experience to validate and de-risk several industrial innovations for wave energy The design tools presented in this article cover different stages of technology or project development: • Multi-physics numerical modelling tools for the design of floating offshore wind turbines • Decision-making tools during the planning phase of offshore wind or ocean energy farms • Structured innovation and stage gate tools for the evaluation of innovations for offshore renewables at early stages of development The reader will be able to find out references to useful open source tools and public documents produced by these projects.Item NAUTILUS-DTU10 MW Floating Offshore Wind Turbine at Gulf of Maine: Public numerical models of an actively ballasted semisubmersible: Public numerical models of an actively ballasted semisubmersible(2018-10-10) Galván, J; Sánchez-Lara, M J; Mendikoa, I; Pérez-Morán, G; Nava, V; Rodríguez-Arias, R; RENOVABLES OFFSHORE; Tecnalia Research & InnovationThis study presents two numerical multiphysics models of the NAUTILUS-10 floating support structure mounting the DTU10 MW Reference Wind Turbine at Gulf of Maine site, and analyses its dynamics. With the site conditions and the FAST model of the onshore turbine as the starting point, the floating support structure: tower, floating substructure with its corresponding active ballast system and station keeping system, was designed by NAUTILUS. The numerical models were developed and the onshore DTU wind energy controller was tuned to avoid the resonance of the operating FOWT by TECNALIA, in the framework of H2020 LIFES50+ project. This concept and its subsystems are fully characterised throughout this paper and implemented in opensource code, FAST v8.16. Here, the mooring dynamics are solved using MoorDyn, and the hydrodynamic properties are computed using HydroDyn. Viscous effects, not captured by radiation-diffraction theory, are modelled using two different approaches: (1) through linear and quadratic additional hydrodynamic damping matrices and (2) by means of Morison elements. A set of simulations (such as, decay, wind only and broadband irregular waves tests) were carried out with system identification purposes and to analyse the differences between the two models presented. Then, a set of simulations in stochastic wind and waves were carried out to characterise the global response of the FOWT.