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Article type: Cover
Pages
Cover1-
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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Article type: Index
Pages
Toc1-
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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Yusuke TAHARA
Article type: Article
Pages
1-6
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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A multi-domain method is set forth for calculating boundary-layer and wake flows around the International America's Cup Class (IACC) sailing yacht. The computational domain is divided into two parts, i.e., the port- and starboard-side domains, where those centerplane (matching) boundaries include keel and rudder surfaces. The Reynolds-averaged Navier-Stokes and continuity equations are solved with the Baldwin-Lomax turbulence model, using a body conforming grid, finite-analytic discretization, and a PISO-type velocity-pressure coupling algorithm. An ovelview is given for the present approach, and numerical results are presented and discussed for an IACC yacht for zero and nonzero yaw angles. Lastly, some concluding remarks are made, including the requirements for extension of the present study.
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Y. KODAMA
Article type: Article
Pages
7-9
Published: May 22, 1996
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Munehiko HINATSU
Article type: Article
Pages
11-14
Published: May 22, 1996
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[in Japanese]
Article type: Article
Pages
15-16
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
Pages
17-22
Published: May 22, 1996
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Takanori HINO
Article type: Article
Pages
23-26
Published: May 22, 1996
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The shape optimization using CFD (Computational Fluid Dynamics) is expected to be a powerful design tool, because CFD can compute inviscid as well as viscous flow fields around a body of complex geometry. In the present paper, the gradient based optimization methods are applied to the shape optimization of a two-dimensional body in which the fluid dynamic objective function is minimized. Flow fields are computed by a finite-volume Navier-Stokes solver. Sensitivity analysis which gives the gradients of the objective function and the constraints is carried out by the adjoint variable method. The numerical procedure is described together with some applications.
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Jun-ichi HAMASAKI, Youji HIMENO, Yusuke TAHARA
Article type: Article
Pages
27-32
Published: May 22, 1996
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This paper presents an application of Computational Fluid Dynamics to ship hull optimization, which is based on the nonlinear programming approach developed by Hamasaki et al. The hull forms are first expressed by the offsets table and variation function using the B-spline functions, whose coefficients are used as the design variables. Then the fully-elliptic Reynolds-averaged Navier-Stokes and continuity equations are solved with zero-equation turbulence model to provide viscous resistance and stern flow information. The aft part of hull is optimized so as to minimize the viscous resistance and the value of wake at the top of propeller disc. The affine scaling interior method is used in the present multi-objective optimization procedure. The present iterative optimization procedure yields steady convergence of the solutions and appeared to be capable for practical ship form design. An overview is given of the present numerical method, and results are presented and discussed for the Series60 CB=0.8 as an initial form including comparison with available experimental data. In addition, requirements for improvements of the present approach are described regarding accuracy in computing the sensitivity coefficients.
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Yasunori IWASAKI, Tadao YAMANO, Takeshi UEDA
Article type: Article
Pages
33-38
Published: May 22, 1996
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In ocean going fine ships such as container ships with high power main engine, it seems almost impossible to improve their propulsive performance to a large extent so far as the conventional stern form is used. The reason is that severe design condition such as a draft restriction, TKM (transverse metacentric height) requirement and propeller tip clearance requirement, restrict the propeller diameter and the stern form modification to a narrow range. The authors developed a new stern form which has better propulsive performance under the above described design, restrictions. This paper describes seakeeping ability and maneuverability of the ship with the new stern form.
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[in Japanese], [in Japanese]
Article type: Article
Pages
39-44
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
Pages
45-50
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
Pages
51-56
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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[in Japanese]
Article type: Article
Pages
57-62
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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Yoshiyuki Inoue, Saeed Seif Mohammad
Article type: Article
Pages
63-68
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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The need for vehicles transportation among Japanese islands is very important, and many large fixed bridges have been constructed across the rivers as well as seas. But, the concept of a floating bridge takes advantage of natural law of buoyacy of water to support the dead and live loads on the bridge. In addition, there is no need for conventional piers and foundation. However, there is not so many data base on such structures, and a direct design should be employed for each case. Therefore, it is important to evaluate their overall behavior in preliminary design stages. In the present study, a method has been developed to evaluate hydrodynamic loads on floating parts of the bridge and to analyze the dynamic behavior of the structure by using FEM. The proposed method takes in to account the hydrodynamic interaction among the floating parts and nonlinear effects such as drag forces. Furthermore, based on numerical results, effects of wave conditions on the dynamic behavior of the bridge are investigated.
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Roby KAMBISSER, Yoshiho IKEDA
Article type: Article
Pages
69-74
Published: May 22, 1996
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
Pages
75-80
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
Pages
81-86
Published: May 22, 1996
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[in Japanese], [in Japanese]
Article type: Article
Pages
87-92
Published: May 22, 1996
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Shigeru NAITO, Norihisa KODAN, Ken TAKAGI, Koichiro MATSUMOTO
Article type: Article
Pages
93-96
Published: May 22, 1996
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
Pages
97-102
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
Pages
103-107
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
Pages
109-112
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
Pages
113-118
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
Pages
119-122
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
Pages
123-128
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
Pages
129-132
Published: May 22, 1996
Released on J-STAGE: December 28, 2017
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Osamu KINOSHITA, Kazuki YABUSHITA, Katsuo SUZUKI
Article type: Article
Pages
133-138
Published: May 22, 1996
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Experiment of Wave analysis is performed in circulating water channel by using three high-speed boat models with trim fixed. An apparatus of making a wave height meter traverse in parallel direction to a ship model is deviced and wave measuring system is developed. In order to reduce amplitude of steady waves and inclination of mean water surface of the channel wave supressor and water level are controled by making use of a reserve tank. The measured wave configuration caused by the model is subtracted by the one measured without the model to cancell the diverging waves caused from the unevenness of the channel side wall. The results of wave analysis are verywell in comparison with total resistance measured by trim fixed type of dynamometer and the wave pattern resistance is almost one third of the total resistance at planning Froude numbers higher than 0.4. The component of diverging wave resistance which is dominant at high Froude number and is noticed as coastal nuisance is calculated from the wave analysis results and it is expanded in terms of bottom cambers of models and running trims. It is concluded that the concave curved bottom boat is better than the others and the control of running trim is moreover important from a view point of reducing the diverging wave resistance.
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