| Project/Area Number |
61850080
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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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 | University of Tokyo |
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Principal Investigator |
KAJITANI Hisashi Univ. of Tokyo, Faculty of Engineering (Professor), 工学部, 教授 (80010693)
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| Co-Investigator(Kenkyū-buntansha) |
NAKATAKE Kuniharu Kyushu Univ., Faculty of Engineering (Professor), 工学部, 教授 (70037761)
MORI Kazuhiro Hiroshima Univ., Faculty of Engineering (Professor), 工学部, 教授 (90011171)
HIMENO Yoji Univ. of Osaka Prefecture, College of Engg. (Professor), 工学部, 教授 (50081394)
KOYAMA Takeo Univ. of Tokyo, Faculty of Engineering (Professor), 工学部, 教授 (10010696)
MIYATA Hideaki Univ. of Tokyo, Faculty of Engineering Assoc. (Professor), 工学部, 助教授 (70111474)
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| Project Period (FY) |
1986 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥15,800,000 (Direct Cost: ¥15,800,000)
Fiscal Year 1988: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1987: ¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 1986: ¥8,100,000 (Direct Cost: ¥8,100,000)
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| Keywords | Finite-difference method / Navier-Stokes equation / Vortex / Turbulent flow / 自由表面波 / 自由表面 |
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| Research Abstract |
Two computer codes for the flow simulation about bodies of complex geometry are developed.
The WISDAM code uses a moving grid system fitted to both a free-surface and a body surface. Since a subgrid-scale turbulence model is employed, it ts a sort of large-eddy simulation which can cope with a transitional phenomenon. In the simulation of a flow about a ship at Re=10^5 realistic profiles of velocity and turbulent kinetic energy are obtained.
The TUMMAC Code demonstrated that a viscous flow about a body of complex geometry can be well simulated in a rectangular grid system. The technique to fulfill the non-stip condition in the boundary cell is proved to be successful. The three-dimensional version is also developed and, by introducing a new concept of porosity into the treatments of body boundary condition, a simulation of a viscous flow about a sphere is achieved.
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