Studies on the optimization of stern hull form based on a potential flow solver |
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Authors: | Email author" target="_blank">Kazuo?SuzukiEmail author Hisashi?Kai Shigetoshi?Kashiwabara |
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Institution: | (1) Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan;(2) Graduate School of Engineersing, Yokohama National University, Yokohama, Japan |
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Abstract: | A hypothesis of the minimum energy of secondary flow, suggested by Bessho, is introduced here. According to this hypothesis, it can be expected that hull forms having frame lines with a minimum energy of secondary flow show less form drag. In the first part of this article, secondary flow energy is evaluated for the cases with and without a free-surface effect, and Bessho’s hypothesis is confirmed for practical hull forms. Then optimization methods for the stern hull form are suggested, in which a nonlinear optimization technique is introduced. Numerical examples are given for a practical tanker hull form and a practical container hull form. From these studies, the suggested optimization method can be confirmed as a simplified and practical design method to the select frame lines of stern hull forms. |
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Keywords: | Potential flow Free surface flow Secondary flow Ship hull form Shape optimization SQP |
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