ABSTRACT

This research investigates designs for duct type of the energy saving device attached on the stern of a VLCC hull form. The parent design for the duct type is SSD (Super Stream Duct), which originally developed by Hitachi Zosen. The CFD (Computational Fluid Dynamics) simulation investigates the flow field around the ship equipped with the energy saving devices as well as their hydrodynamic effects on the resistance reduction and propulsive performance. Considering a wide range of design parameter variation studies for the ducts, reduction of the resistance and increase of the hull efficiency are numerically analyzed. The optimal shapes of duct are selected by numerical computation. The main idea for the energy saving duct is focused on the improvement of the hull efficiency in order to increase the propulsive efficiency. For verifying the energy saving effects of the selected device, the typical towing tank model tests are carried out at the towing tank.

Keywords:
bare hull 0, duct, reduction, propeller, efficiency, duct radius, lower chord length, resistance, test condition, hull form
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2013. International Society of Offshore and Polar Engineers
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