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Marine renewable energy

Keywords: Marine Energy Converters, Off-shore Platforms, Wave and Wind Farms, Mooring Systems, Foundations
Fig. 1 Wave flume experiments on the dynamics of mooring systems (Author: Alberto Lamberti)
Fig. 2. Experiments on a farm of WECS with a spread mooring system and PTO on board (Author: Barbara Zanuttigh)
Fig. 3. Numerical modelling of a farm of WECs with MIKE21 BW (Author: Barbara Zanuttigh)

The huge potential of the European seas is still far from being recognised and can significantly contribute to the mitigation of climate change effects. However the installations for Marine Renewable Energy (MRE) exploitation are still not competitive in terms of costs, and require design optimization for improving device survivability and conversion efficiency also in milder climates.

Due to the massive development of marine infrastructures, it is crucial to adopt a holistic approach towards sustainable use of the marine space. This research tackles the challenge to combine the MRE installations with other offshore installations for aquaculture, transportation, etc. and with near-shore and on-shore installations for coastal and harbour protection purposes.

The research on floating devices focuses mainly on the design of floating support for offshore wind in deep water, on the mooring systems for Wave Energy Converters (WECs), Fig. 1, and on the hydrodynamics around WEC farms, Fig. 2.

Numerical modelling of wave-WEC interaction and dynamic response of moorings is performed under simplifying assumptions with the 2DH Mike 21 BW code (Fig. 3) and with the software ANSYS AQWA. More sophisticated codes (NEMOH, CFD Open foam, and Star CCM and Reef 3D ) have been also used to model offshore floating wind turbine and ocean device for the mixing of water.

Research has been carried out on the development and optimisation of two new prototypes of a WEC point absorber specifically designed for the Mediterranean conditions.

Geotechnical aspects relevant to novel foundation solutions for offshore wind turbines have been also investigated, and specifically the use of shallow foundations (e.g. bucket foundations) as a cost-effective alternative to monopiles. The response of shallow foundations subjected to combined and cycling loading conditions is studied through the macro-element approach and extensive experimental campaigns. The extension of the approach to bucket foundations subjected to offshore environmental loads is ongoing.

Main publications

Zanuttigh B., Angelelli E., Kortenhaus A., Koca K., Krontira Y. and P. Koundouri, (2016). Methodology for multi-criteria design of multi-use offshore platforms for marine renewable energy harvesting, Renewable Energy, 85, 1271-1289.

Schweizer, J., Antonini, A., Govoni, L., Gottardi, G., Archetti, R., Supino, E., Berretta, C., Casadei, C., Ozzi, C. (2016). Investigating the potential and feasibility of an offshore wind farm in the Northern Adriatic Sea, Applied Energy, 177, 449- 463.

Zanuttigh B., Angelelli E., Bellotti G., Krontira Y., Suffredini R., Airoldi L., Franceschi G., Troianos D., Romano A., Zagonari F., Cantù M., Taramelli A., Jimenez C., Evriviadou M., Filipponi F., Broszeit S. (2015). Boosting blue growth in a mild Sea: analysis of the synergies produced by a multi-purpose offshore installation in the Northern Adriatic, Italy, Sustainability, 7, 6804- 6853.

van den Burg, S.; Stuiver, M.; Norrman, J.; Garção, R.; Söderqvist, T.; Röckmann, C.; Schouten, J.; Petersen, O.; Garção, R.; Diaz-Simal, P.; de Bel, M.; Meneses Aja, L.; Zagonari, F.; Zanuttigh, B.; Sarmiento, J.; Giannouli, A.; Koundouri, P. (2016). Participatory Design of Multi- Use Platforms at Sea. Sustainability, 8(2), 127.

Antonini, A.; Lamberti, A.; Archetti, R. (2015). OXYFLUX, an innovative wave-driven device for the oxygenation of deep layers in coastal areas: A physical investigation. Coastal Eng, 104. 54-68.

Foglia, A., Gottardi, G., Govoni, L., Ibsen, L.B. (2015). Modelling the drained response of bucket foundations for offshore wind turbines under general monotonic and cyclic loading Applied Ocean Research, 52, 80-91.

Mendoza E.; Silva R., Zanuttigh B., Angelelli E., Lykke Andersen T., Martinelli L., Nørgaard J., Ruol P. (2014). Beach response to wave energy converter farms acting as coastal defence, Coastal Eng., 87, 97-111, Elsevier.

Zanuttigh, B., Angelelli, E. and Kofoed, J. P., (2013). Effects of mooring systems on the performance of a wave activated body energy converter, Renewable Energy, 57 (9), 422–431.

Zanuttigh, B. and Angelelli, E. (2013). Experimental investigation of wave energy converters for coastal protection purpose, Coastal Engineering, 80, 148-159.

Bozzi, S., Miquel, A.M., Antonini, A., Passoni, G. and Archetti, R. (2013). Modelling of a point absorber for energy conversion in Italian Seas. Energies, 6, No 6, 3033-3051.

Martinelli, L. , Zanuttigh, B. and Kofoed, J. P. (2011). Method for selection of maximum PTO design power based on statistical analysis of small scale experiments on Wave Energy Converters. Renewable Energy, 36, No 11, 3124- 3132.

Research projects

H2020 DRS-09-2015 ID: 700699. Project: BRIGAID. Bridging the Gap for Innovations in Disaster Resilience.

EU FP7-OCEAN-2011-1 ID 288710. Project: MERMAID. Innovative Multi-purpose offshore platforms: planning, design and operation. www.mermaidproject.eu

EU-FP7-ENV2009-1 ID 244104 Project: THESEUS. Innovative technologies for safer European coasts in a changing climate. www.theseusproject.eu

EU-FP7- ENERGY ID 213633. Project: CORES. Components for Ocean Renewable Energy Systems. www.fp7-cores.eu/index.html

International Research Alliance supported by the Danish Council for Strategic Research. Project: SDWED. Structural Design of Wave Energy Device. www.sdwed.civil.aau.dk

EU-FP7-Capacities MARINET. Project: REDEM. Reliable design of mooring system of Wave Energy Converters. www.fp7-marinet.eu/

National project supported by the Italian Ministry of University and Research. Project: RITMARE. www.ritmare.it/en