Improving the Performance of a Sail-asssisted Cargo ...

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GRØN DYST 2014 Technical University of Denmark

Improving the Performance of a Sail-asssisted Cargo Vessel
Author:E. Mobron (3ME, Delft University of Technology, The Netherlands)
Date: 2014-06-27     Track: Main     Session: 1

In this research, a methodology is developed that can give trustworthy figures on fuel savings and margins of profit and provides more insight into the hull form of a sail-assisted cargo vessel. A sail-assisted cargo vessel works by the forward force induced by engine and sails. The larger the force from the sails, the less power is required by the engine and thus the larger is the fuel saving. However, the sails also produce a force in lateral direction, called the heeling force. This force is counteracted by an equal and opposite force induced by the hull: side force. The hull form and dimensions determine how much resistance is associated with producing this side force and thus how much additional power is required from the engine. The dimensions of the hull also have an effect on the costs of building it: a longer vessel is more expensive. A combination of existing methods has been used in order to assess the total costs of a number of vessel variations. First, the hydrodynamic performance of the hull is determined by use of Computational Fluid Dynamics (CFD). This data is used for a routing simulation that uses historic weather data in order to simulate a vessel’s operation during twenty years. From this, the fuel consumption can be determined. Finally, the fuel costs and the building cost are combined to provide a figure for the economic performance. By systematically assessing a set of variations an optimum hull can be found and it can be compared to a conventional cargo vessel with the same capacity.