1993 Fiscal Year Final Research Report Summary
A Study on Nonlinear Free Surface Flows around a Submerged High Speed Foil
| Project/Area Number |
04302037
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| Research Category |
Grant-in-Aid for Co-operative Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
船舶抵抗・運動性能・計画
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
MORI Kazu-hiro Hiroshima U., Eng., Professor, 工学部, 教授 (90011171)
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| Co-Investigator(Kenkyū-buntansha) |
KATAOKA Katsumi Kyushu U., Eng., Reasearch Associate, 工学部, 助手 (60185791)
NARATAKE Kuniharu Kyushu U., Eng., Prof., 工学部, 教授 (70037761)
DOI Yasuaki Hiroshima U., Eng., Ass.Prof., 工学部, 助教授 (10134454)
IKEHATA Mitsuhisa : Yokohama NU, Eng., Prof., 工学部, 教授 (10114969)
MIYATA Hideaki U.of Tokyo, Eng., Ass.Prof., 工学部, 助教授 (70111474)
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| Project Period (FY) |
1992 – 1993
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| Keywords | Free Surface flow / Finite difference / Rankine source method / wave breaking / spray / wave height measurement / submerged foil |
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| Research Abstract |
Through the present cooperative research, following fidings can be mentioned.1. A new finite difference method such as an artificial third order difference, a numerical wave absorber and a composite grid system are newly introduced for the free surface flow computations. The application showed that the method was much better both in accuracy and in efficiency. A method applicable to the wave breaking phenomena is also developed to simulate breaking waves of a progressive wave and around bow of piercing bodies. Some data were compared with the experimets.
2.An improvement for the Rankine source method is introduced where an optimized basic flow is used. The method is applied to simulate the flow around a tandem hlydrofoil to find the optimum arrangement.
3.Strong nonlinear phenomena such as wave/wake interaction and spray around a planing plate are studied to make clear the phenomena.
4.A new wave hieght measurement method is developed where an image processing techniques are used. The visualization is carried out by illuminating the water/air boundaries. Because the method is a non-contact type, it can be positively used for the studies on a strongly nonlinear free-surafce flow where even a tatch changes the flow.
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