Session: 08-06-01 non-presentations

Paper Number: 128601

128601 - Hull Form Optimization of a Twin-Screw Full Ship 

To optimize a hull form of a twin-screw vessel with a block coefficient of about 0.9 to reduce its resistance and improve the quality of propeller wake field distribution. Firstly, numerical simulations of the parent hull form were carried out at design draft and design speed by using CFD methods to analyze the dynamic pressure distribution, wave pattern, streamlines around the hull, etc. and determine the optimization direction. Then, under displacement and geometrical constraints, modifications were made to the bow entrance angle and bow shape to reduce wave resistance and make pressure distribution more uniform. The transom length at the aft body was increased and the run angle in longitudinal sections of the middle ship was reduced to avoid possible flow separation. Around the stern fins, fullness was increased and run angle decreased to refine the fin shape, fair the fins to avoid shoulder interference, and also improve propeller wake uniformity. After several optimization iterations, while satisfying all constraints, the total resistance was reduced by over 6%, free surface wave making was significantly reduced, bow pressure distribution was more uniform, and no obvious flow separation occurs near the stern. The optimization achieved the goal of reducing ship resistance and saving energy.

Key words: twin-screw, full ship, hull form optimization, CFD

Presenting Author: Yulong Guo Shanghai Ship and Shipping Research Institute

Presenting Author Biography: Major in unconventional tank test and its numerical simulation.

Authors:

Li Zhang Shanghai Ship and Shipping Research Institute
Yulong Guo Shanghai Ship and Shipping Research Institute