Wind Jack

The objective of the Wind Jack JIP is to be able to understand and predict the impact loads between the seabed and legs of jack-up type wind turbine installation vessels during the moment of touch down and lift off. These are considered as the critical phases in the operational cycle of wind turbine installation vessels and as such limit the uptime.


BreaKin (from BREAKing waves and their KINematics) is a new joint research initiative addressing wave impact loading on offshore structures. The objective of the BreaKin JIP is to determine the occurrence of breaking waves, to model the associated water particle kinematics and to describe the different types of wave loading that results. This research will provide improved predictions of the breaking wave loads acting on offshore structures, including scale effects, and it will help define the probability of occurrence.

Contact: Jule Scharnke,

Within the Wind Jack JIP a numerical tool was developed to determine the seabed impact loads on the legs of wind turbine installation vessels. The tool consists of a soil reaction force module developed by Deltares coupled to MARIN’s existing hydro- dynamic time domain analysis program aNySIM-xmf. In 2014, the tool was finalised and validated by hydrodynamic model tests performed in MARIN’s Shallow Water Basin. Furthermore, the tool has been incorporated in a workability analysis tool which makes it possible to determine the uptime of wind turbine installation vessels depending on soil type, scatter diagram and user defined operational criteria.

Contact: Jorrit-Jan Serraris,


Wind loads are important for installation, operational and extreme design loads for floating offshore structures and ships. However, despite their importance there is surprisingly little industry guidance about wind loads.

MARIN believes that wind tunnel tests will remain the main tool for wind load predictions in the near future. If not, alternative methods may be needed earlier in the project such as CFD. Though here too, guidance with respect to the set-up and execution of those computations is missing. Another issue is the lack of common guidance on the vertical velocity profile and associated turbulence intensity for the designs. The first task of the Wind Load JIP is to test a scale 1:230 FPSO wind tunnel model in three different wind tunnel facilities. This exercise will then be repeated for a semi submersible. The JIP completes end 2016.

Contact: Jaap de Wilde,



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