Maintenance Operability of wind park maintenance vessels

For maintenance on offshore wind turbines a wide range of vessels and strategies is available. The objective of the Offshore Maintenance (OM) JIP is to select the most suitable maintenance strategy and vessel for a wind park and for any time of the year. To realise this objective the existing Operations and Maintenance Tool (O&M Tool), developed by the Energy research Centre of the Netherlands (ECN), has been extended with vessel hydrodynamics (contributed by MARIN) and human factors, provided by TNO. The O&M Tool, including enhancements, is shared with the participants of the JIP to calculate the operability of their maintenance solution.

The project got underway in 2015 and so far 14 different participants have joined including research institutes, shipbuilders, OM operators, OM personnel, access system operators and utility companies.

Contact: Jorrit-Jan Serraris,

ComMotion Computational methods for moving and

deforming objects in extreme waves

ComMotion is the latest in a line of joint industry projects focusing on the development of the CFD code ComFLOW – a fast and efficient tool for the simulation of violent free surface flows around offshore structures. ComFLOW sets itself apart from other CFD codes by its unique set of dedicated numerical algorithms, designed to have optimal performance in the field of wave impact simulations. Within the ComMotion JIP, developments focus on extending the functionality of ComFLOW to fast simulation of multiple, interactively moving bodies (including their moorings, fenders etc.), simulation of hydro-elastic structures, and generation of deterministic steep and breaking waves, in combination with current. Within the JIP, the computational efficiency of the code is also optimised by employing the latest hybrid parallelisation techniques.

Participants are still welcome to join the JIP, which will run until end 2018. Code validation, benchmarking and developments made in previous ComFLOW JIPs will be made available to all participants.

Contact: Joop Helder,

Moonpool-2 Moonpools in waves during


Large water motions occurring in the moonpool when the vessel is operating or transiting in waves can be critical, as the equipment installed in the moonpool could be damaged. To minimise the risk of damage, the operations may even have to be suspended. Recently, its predecessor, the Moonpool JIP, which investigated the mechanisms leading to water motions in the moonpool during transit, was successfully completed However, the effect of incoming waves was not considered in that project.

Moonpool-2 aims to investigate water oscillations occurring in moonpools during operations in waves. Different moonpool configurations will be considered, from rectangular bare to confined turret moonpools. The JIP is expected to start in Q2, and will be conducted in close cooperation with oil companies, vessel design companies, classification societies, operators and offshore contractors.

Contact: Frédérick Jaouën,



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