Hull Form Transformation and Optimization of the Sea Arrow Bow for a Containership
Date Issued
2011
Date
2011
Author(s)
Cheng, Wei-Yuan
Abstract
Containerships with bulbous bow are the major type in the sea transportation and have been proved well over decades. An aim of our modeling was to reform the bulbous bow of a 1700 TEU containership into an arrow bow. Second, we would like to find the key geometric parameters of the arrow bow that affect the hydrodynamic performance. The geometry was fully parameterized, while keeping the principle dimensions and afterbody geometry the same. Non-uniform Rational B-spline theory was applied on the forebody sections to guarantee surfaces with high-order smoothness. An optimization algorithm was used to find the relationship between the parameters and the wave-making resistance coefficient. For increasing computing pace ,in optimal process only evaluated Wave-making performance by potential flow theory, and was compared to the conventional one. The outstanding geometries were selected, and then evaluated the total resistances by CFD. Fifteen versions of arrow bows were made, and six of them were calculated by CFD. The minimum Cw was 10% less than the original, but the total resistance is 2% higher. The main contribution to the increment of the total resistance is the pressure term, which is 4% larger than the bulbous one. Also, the wave elevations of the arrow bow were inspected two times larger at the fore perpendicular. During the process, four parameters were found to affect Cw effectively. The parametric modeling process of the arrow bow of containerships may provide the basis in the designing stage. But the mechanism to reduce the wave peak at the FP needs to be studied further.
Subjects
Arrow bow
Optimization
Container
Lines
Type
thesis
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