| Project/Area Number |
12450399
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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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| Research Field |
船舶工学
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| Research Institution | Yokohama National University |
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Principal Investigator |
SUZUKI Kazuo Yokohama National University, Faculty of Engineering, Professor, 大学院・工学研究院, 教授 (80111699)
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| Project Period (FY) |
2000 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥10,400,000 (Direct Cost: ¥10,400,000)
Fiscal Year 2003: ¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2002: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2001: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2000: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | Hydrodynamic Interaction / Fluid Resistance / Shape Optimization / Drag Reduction / Hull Form Optimization / 船形最適化 |
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| Research Abstract |
In the present studies, reduction of fluid resistance acting on ships is discussed, which is based on hydrodynamic interactions between the main hull and attached parts like a bulb, a wing, a spike or an outrigger. Investigations on hydrodynamic interactions are carried out experimentally by resistance tests in a towing tank and/or visualization methods in a circulating water channel and numerically by panel methods based on potential theories like Rankine source method or Morino's panel method. As the main themes of the present studies, the following research works are discussed.
・Optimization of bow bulb to minimize wave making resistance [Mono-hull]
・Reduction of wave making resistance by off centerline bulbs (twin bulbs) [Mono-hull]
・Reduction of wave making resistance by bulbs installed on center plane of catamaran [Catamaran]
・Wave making characteristics of multi-hull vessels with outriggers or sponsons [Multi-hulls]
・Reduction of wave breaking resistance by spike attached in front of bow [Mono-hull with bluff bow]
In the cases excluding the last one, the wave making resistance acting on high speed vessels designed at high Froude numbers can be reduced. Especially, in the first case, the bulb shape and the fore body of ships are optimized by means of Rankine source method and the nonlinear programming. In the last one, the wave breaking phenomena can be changed by means of the spike and its availability to reduce the wave breaking resistance is investigated experimentally.
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