Numéro : 2815 - Year : 2025
Berthing vessels against wind turbines in an irregular wave
Laurent BARTHELEMY - École Nationale Supérieure Maritime – Pôle EMR – Nantes
The author proposes a method to calculate weather criteria for vessel boarding against fixed wind turbines. For such a complex mechanical phenomenon, the calculation investigates a state control model: over the time, the friction may be either kinetic or static. International guidelines prescribe that "95% waves pass with no slip above 300mm (or one ladder rung)". To meet such acceptability criteria, it becomes necessary to investigate boarding under a real state, which is an irregular wave. Such “real-world” wave also strengthens the practical implications of the presented calculations.
The calculation models the “bump and jump” against the monopile of a fixed wind turbine.
Results with 1.5m significant wave height show a suitable boarding condition for 95% waves, although with slip above one ladder rung. Tous droits de reproduction réservés – ATMA 2025
Other results compare simulation and model tank test for a boat of the same length from another publication. Simulation and model test results show the same behaviour qualitatively, although both boats have different hulls. Therefore, such comparison strengths the findings.
The findings meet some results from other publications. The outcome then is to perform a sensitivity study, over various seastates. Then the results are compared against professional practises. Moreover, a calculation is done with a variable propeller thrust, to consider a thrust regulator.
Eventually a further axis of development will be to investigate vessel boarding against not fixed, but floating wind turbines.
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