DESIGN TOOLS FOR OFFSHORE RENEWABLE ENERGY ENERGETIC TECHNOLOGY COLLABORATION Jose Luis Villate, Pablo Ruiz-Minguela, Germán Pérez, Vincenzo Nava, Eider Robles Non-conventional sources of energy Publicaciones DYNA SL -- c) Mazarredo nº69 - 4º -- 48009-BILBAO (SPAIN) Tel +34 944 237 566 – www.revistadyna.com - email: dyna@revistadyna.com Pag. 1 / 8 DESIGN TOOLS FOR OFFSHORE RENEWABLE ENERGY Jose Luis Villate 1 , Pablo Ruiz-Minguela 1 , Germán Pérez-Morán 1 , Vincenzo Nava 1 , Eider Robles 1,2 1 TECNALIA, Basque Research and Technology Alliance (BRTA), Parque Tecnológico de Bizkaia; Astondoa Bidea, Edificio 700. E-48160 Derio - Bizkaia (Spain) T +34 946 430 850. E-mail joseluis.villate@tecnalia.com 2 Department of Automatic Control & Systems Engineering University of The Basque Country (UPV), 48013 Bilbao, Spain Received: 08/Jul/20 - Reviewing: 10/Jul/20-Accepted: 01/Sep/20 -DOI: http://dx.doi.org/10.6036/9848 1.- INTRODUCTION Offshore wind is growing very fast with 22 GW of cumulative power and more than 5,000 turbines installed in Europe by the end of 2019 [1] while other offshore renewable technologies such as tidal stream or wave power are still in their infancy with a number of projects in the range of MW [2]. Offshore wind deployment is mainly concentrated in areas with continental shelf, such as the North Sea in Europe, where shallow waters can be found hundreds of km far offshore. However new solutions for deeper waters are emerging (mainly based on floating platforms) allowing offshore wind deployment in many places around the world [3]. Renewable Energy sources play a fundamental role in the fight against climate change. The crisis caused by covid-19 can make the world forget this fight by adopting economic measures that are harmful to the health of our planet. And this is what thirteen EU Environment and Climate ministers requested to Brussels. Along the same lines, the European Alliance for a Green Recovery arises, supported by a continuously growing number of representatives from the political, economic and social world. In their manifesto they demand that the European Green Deal [4] approved in January 2020 with the ambitious plan to make Europe the first climate-neutral continent by 2050, should be the way out of the crisis. In fact, offshore renewable energy sources 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 cost competitive technologies. Design tools can help to accelerate cost reduction in early stages of technology development or project planning. The objective of this article is to introduce some examples of design tools developed within four R&D European projects in order to present their main functionalities and provide references for further documentation and use. These include multi-physics numerical modelling; decision-making tools during the planning phase and structured innovation and stage gate tools. Section 2 describes a multi-physics approach methodology for numerical modelling from the initial design, to model experimental validation and Hardware In the Loop (HIL) testing, including downloadable documentation and public models. Section 3 describes open-source decision-making design tools to asses different alternatives for deployment of offshore renewable farms for wave and tidal energy arrays. Finally, section 4 extends new design tools focused on fostering the innovative thinking and asses the development and deployment of device concepts through the evaluation of different metrics. 2. MULTI-PHYSICS NUMERICAL MODELLING Numerical models are used in the wind sector for the simulation of the behaviour of systems, subsystems and components, for their design validation. In onshore wind, numerical modelling characterizes the aerodynamics, in order to simulate the loads and effects on different components. The objective is to verify the structural design of those components or subsystems. In offshore wind, hydrodynamic effects must also be considered, and the models become more complex. A multi-physics approach, with aero-hydro- servo-elastic models, allows to include all the coupled effects to which a wind turbine is subjected. Coupling effects are even more complex when floating wind turbines are modelled, since the turbine is subjected to hydrodynamic effects that affect the aerodynamic loads over it: the mooring system introduces an additional degree of freedom in comparison to fixed offshore wind turbines. TECNALIA follows this multi-physics approach in its projects with the following steps:  Definition of the Design Basis: site conditions, wind turbine, design standards and substructure features  Definition of the Design Load Cases: Driving Design Load Cases and full set of Design Load Cases (DLCs).