A parent ship 63500 DWT bulk carrier is a relatively mature hull form, and the line plan has been verified by model test and full-scale ship trial, and its resistance and propulsion performance proved to be excellent.A new optimized hull form was proceeded based on this parent ship. The goal of optimization is to obtain better resistance performance in the loading state of scantling draught and design draught.Firstly, the numerical simulation of the parent ship was carried out, the flow field information around the hull was analyzed, the area of high or low pressure gradient was checked, and the area was optimized to make the pressure gradient distribution more uniform. At the same time, the length of the run body was lengthened to reduce the flow separation area, and the entrance body of the bow was optimized to reduce the wave-making resistance.Aiming at these above optimization objectives, the variation range of hull form was set by commercial software CAESES, and the total resistance of generated optimized cases was evaluated by STARCCM+ software.To grantee the resistance reduction at both design draught and scantling draught, by using the multi-objective optimization method, the resistance weights of scantling draught and design draught were set as 50% respectively, that is, the total resistance of optimized hull form equals 50% resistance of design draught condition and 50% resistance of scantling draught condition. The optimization results of total resistance were compared and analyzed, and the cases with relatively minimum total resistance were obtained. On this basis, the wake field at the propeller area was optimized either, and finally, the target optimization of hull form was obtained. The numerical results showed that, compared with the parent ship, the total resistance at the design speed of the design draught was reduced by about 1.7%, about 2.1% at the design speed of the scantling draught. The wake distribution on the propeller area was more uniform. The final optimized hull form meets the target requirements.Finally, the model test of the optimized ship form was carried out. After comparing the numerical simulation results with the model test results, the error of the numerical simulation results was less than 3%, which proves that the numerical simulation results achieve high accuracy.

Hull Form Optimization for a 62000DWT Heavy Lift Multi-Purpose Vessel

Paper Proceedings: https://asmedigitalcollection.asme.org/OMAE/OMAE2021/volume/85116

OMAE 2021

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