LeanShips demonstrates fuel-saving potential


Energy-saving solutions are the focus of the LeanShips’ initiatives. MARIN and its partners are involved in several projects.


T


he Damen Shipyards-led, EU project initiative LeanShips has been awarded funding from the


European Commission under the Horizon 2020 programme. In LeanShips, fuel and energy saving solutions are demonstrated on board in true conditions or in more protected environments through shop or model tests. These energy saving solutions are close to market but require a final demonstration before they are adopted.MARIN plays an important role, both in numerical simulations during the design, as well as during the model and full-scale tests.


LeanShips is built entirely around eight demonstrators which act independently and all focus on different energy saving solutions. Projects focus on alternative fuels, machinery or hydrodynamic solutions.


Maarten Flikkema m.flikkema@marin.nl


MARIN contributes to a demonstrator case on a Large Diameter Propeller (LDP) and to the design of Energy Saving Devices (ESDs) for ships with Controllable Pitch Propellers (CPP).


Large Diameter Propeller The LDP demonstration case is lead by Rolls-Royce working with Chalmers University, Wagenborg, Conoship, Lloyds and MARIN. Energy losses are reduced through the large diameter because it facilitates a smaller rotation rate. The large diameter also leads to a smaller clearance between the propeller and hull. In this unique project, a simultaneous and inte- grated optimisation of propeller and hull is performed directly at full scale by means of CFD.


As MARIN is looking for the biggest possible propeller, the project is exploring the limits of what is just acceptable from the point of view of hull pressure pulse fluctuations. To study and include the cavitation hindrance from the propeller from the early design stage onwards, MARIN’s coupled RANS-BEM solver for the hull and propeller is being used. In this way, possible limitations from propeller induced pressure pulses can be included from the start.


A consequence of a large diameter propeller is that the ship needs to sail with more trim


Computed axial velocity distribution in the centre plane for the full scale vessel, showing the small propeller-hull clearance. Computations were made with the PARNASSOS-PROCAL (RANS-BEM) solver for hull-propeller modelling. 16 report


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