2023 Fiscal Year Final Research Report
Sophistication of performance model for ship navigation in ice assuming transpolar sea route
| Project/Area Number |
21H01553
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 24020:Marine engineering-related
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| Research Institution | Kogakuin University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
北澤 大輔 東京大学, 生産技術研究所, 教授 (30345128)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 氷海工学 / 耐氷船 / 流体力 / 氷荷重 / 数値流体力学 / 水槽試験 |
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| Outline of Final Research Achievements |
In this study, we aim to develop and validate a fluid force model acting on ice floes for ship navigation in the Arctic Ocean, where ships navigate through open water areas within clusters of ice floes. The fluid force acting on downstream ice floes within dense ice clusters decreases with an increasing number of ice floe rows in tank tests, whereas it increases in numerical simulations. The numerical simulation results suggest that the size of the separation region changes with the arrangement of upstream ice floes. This indicates that the reproducibility of ice floe shapes and configurations in numerical simulations affects the reproducibility of separation. In actual sea areas, where numerous ice floes exist and their shapes are not uniform, separation is expected to occur more complexly than in our analysis. Therefore, the fluid force on downstream ice floes within dense ice clusters in tank tests is presumed to be closer to real-world phenomena.
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| Free Research Field |
船舶海洋工学
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| Academic Significance and Societal Importance of the Research Achievements |
船舶周りの氷片運動を伴う航行において、流体力の影響は相対的に小さいため、これまで詳細に検討されておらず、たとえば船体抵抗への流体力の寄与は開水中抵抗と等しいとされることが多い。実際には周囲氷片の影響により流体力は減衰すると考えられるがどの程度減衰するかは不明である。本研究は流体力の傾向を示したこと、また数値解析における氷片形状や配置の再現性が重要であることを示したことなどに学術的意義があると考える。これにより氷海中航行における船体抵抗の推定精度を向上させる見通しを得たことは、船舶の航行性能や燃費推定に寄与する。
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