by the stern in ballast conditions, or that emerging propeller blades are accepted. Both possibilities will be addressed during this project. Because the constraints on trim are expected to affect the operational performance on the North Atlantic route in terms of bow slamming and added resistance in waves, scenario simulations have been carried out at an early design stage with four different bow shapes. Full RANS modelling for the hull and propeller will be used to study the effects of ventilation, which will be verified by model tests in MARIN’s Depressurised Wave Basin.


The LDP is designed for one of the Wagen- borg trade routes. This vessel has to meet ice-class rules whereby a minimum propel- ler hull clearance is prescribed. As the LDP will violate this minimum clearance criteri- on, MARIN will perform dedicated model tests in ice to show that the loads of the ice on the blades do not exceed the maximum allowable.


Energy Saving Device for ships with Controllable Pitch Propellers In the FP7 EU project GRIP, MARIN and its partners developed and demonstrated a technique to design Energy Saving Devices (ESD) for ships with Fixed Pitch Propellers (FPP). The fuel savings for a pre-swirl, ESD were shown to be nearly 7% for a bulk carrier and there was even more fuel saving potential for other ships. Similar fuel savings can be achieved for ships with a Controllable Pitch Propeller (CPP). Designing these devices for a CPP however, adds some complexity as the pitch angle, and thus the propeller swirl, is more varied over the operational profile.


Together with Wärtsilä and Grimaldi, MARIN will take up this complex challenge. First a scan of potential ESDs will be made and a design strategy will be developed, which will apply different numerical tools at different stages of the design. Subsequently, Wärtsilä and MARIN will design an ESD for the Grimaldi ship which will have the best business case for model testing and full-scale demonstration. Scale effects on the ESD will be studied using CFD and by the comparison between model and full-scale tests. Work on the device for the CPP started in the second quarter.


LeanShips has received funding from the European Union’s Horizon 2020 research and innovation programme. (Contract No.: 636146)


Four different bow shapes used in early stage scenario simulations to study the effect of the bow shape on added resistance and operational performance on a North Atlantic route.


report 17


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