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Report Deliverable D3

Seakeeping, especially for the roll motions, is of critical importance to the safe operation of fishing boats in Indonesia. In the first section of this Deliverable D3 report, a traditional East Java Fishing Boat (EJFB) has been analysed in terms of its seakeeping performance. Furthermore, a bilge keel was designed to reduce the roll motions of the EJFB using multiple stages approach. After installing the designed bilge keels, it was shown that up to 11.78 % and 4.87 % reduction in the roll response of irregular seaways and the total resistance under the design speed, respectively. It was concluded that the roll-stabilized-EJFB will enhance the well-being of the fisherman and contribute to the boats’ safe operation, especially in extreme weather conditions. Moreover, the total resistance reduction of the EJFB due to the installation of the designed bilge keels also resulted in increased operational efficiency and reduced fuel costs and fuel emissions for local stakeholders.

The experiment on the Prohaska test, Calm water resistance test and the seakeeping test of the EJFB were also carried out in the Kelvin Hydrodynamic Lab in the University of Strathclyde. Corresponding results are presented in the second section of this Deliverable D3 report.

A high-speed fishing boat optimization is always a different issue to deal with, since the wave-making resistance decreases while the splashed resistance increases sharply. To reduce fuel consumption and operating costs in the current economic climate, in the third section of this Deliverable D3 report presents a fishing boat optimization approach using the CFD technique. The RANS-VoF solver was utilized to calculate total resistance, sinkage and trim for a fishing boat. The arbitrary shape deformation (ASD) technique was used to smooth alter the geometry. On account of a complicated nonlinear problem of a ship hull form optimization, a hybrid algorithm was presented in this paper. Herein, a design of experiments (DoE) method was applied to find an optimal global region and a mathematical programming was employed to determine an optimal global solution. Under the same displacement with the original hull, two optimization loops were built with different design variables. After the completion of the optimization, two optimal hull forms were obtained. The optimization results show that the optimization loop presented in this study can be used to design a suitable fishing boat in the reduction of the total resistance.

 

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