1996 Fiscal Year Final Research Report Summary
Development of Ship Hull Optimization Method Based on Computational Fluid Dynamics
| Project/Area Number |
07555314
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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 | 試験 |
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| Research Field |
船舶工学
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
HIMENO Yoji Osaka Prefecture Univ.Dept.of Marine System Engineering, Professor, 工学部, 教授 (50081394)
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| Co-Investigator(Kenkyū-buntansha) |
TAHARA Yusuke Osaka Prefecture Univ.Dept.of Marine System Engineering, Research Associate, 工学部, 助手 (10264805)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Computational Fluid Dynamics / Hull form optimization / Tanker form / lowered stern vibration / lowered viscous resistance / multi-objective optimization |
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| Research Abstract |
The objective of present research project is development of ship hull optimization method based on Computational Fluid Dynamics. In the two year research project, the numerical method has been developed and applied to improve aft. part of tanker ship without a stern bulb. In this study, stern shape was modified so as to decrease the viscous resistance and increase the propeller inflow at the top of the disc, which results in lowered stern vibration. The present numerical approach includes the Reynolds-averaged Navier-Stokes Equation method to solve viscous flow fields around a ship, the two-dimensional B-spline function to express stern-modification function, the iterative optimization procedure utilizing locally linearized solutions, and the scalar multi-objective function with weight averaging. The numerical results show that the stern form is modified to have characterized V-type frame line if only viscous resistance is minimized. On the hand, the stern-bulb type frame line appears if only propeller inflow at the top of the disc is increased, furthermore, combined type of frame line of above-mentioned was obtained if viscous resistance is minimized and inflow at the top of propeller disc is increased. These results agree well with the experimental data, which had been obtain in circulation water channel.
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