Second-lrder Changes in Mean Surface Level and Long Period Motious of an Offshore Structure in Shallow Water
| Project/Area Number |
04650398
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
船舶構造・建造
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| Research Institution | Osaka University |
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Principal Investigator |
SAITO Kimio Osaka University, Naval Arch. & Ocean Eng. Assoc.Prof., 工学部, 助教授 (50029279)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAGI Ken Osaka University, Naval Arch. & Ocean Eng. Lecturer, 工学部, 講師 (90183433)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1993: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1992: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Shallow Water / Second-order Changes in Mean Surface / Second-order Velocity Potential / Long period Wave Forces / Offshore Structure / Long Period Motions / 2次オーダ速度ポテンシャル |
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| Research Abstract |
The research on the second-order changes in mean surface level and long period motions of an offshore structs in shallow water have been done during the term of this project and the fellowing reslts have been obtained : 1)The second-order changes in local mean surface level induced by two-dimensional bichromatic radiation waves in an experimental flume with a paddel thpe wave maker have been investigated. From the numerical examples, it has been found that the free-wave vomponent plays an important roll in the evaluation of the local mean surface level. 2)The second-order diffraction problem for a fixed body in bichromatic waves has been solved exactly including the effects of second-order free wanes generated by a wave maker and it has been found that : a)The effects of the second-order velocity potential on the second-order long period wabe forces cannot ve neglected in shallow water. b)The reasonable prediction of second-order long wave forces.
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Report
(3 results)
Research Products
(9 results)
