箱型浮体の流体力に関する3次元影響

概要

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The box shaped floating body which is one of the basic shapes for various offshore structures has a low length-breadth ratio, which is nearly 1. Because of this, it is necessary to consider the three-dimensional effect for prediction of hydrodynamic forces acting on them. The three-dimensional method of calculation being very complex, it is not rational to apply it to box shaped bodies. In this paper, we compared the hydrodynamic coefficients obtained from both two-dimensional potential continuation method and three-dimensional source method. From this, we found out the length-breadth ratio below which the three-dimensional method of calculation is necessary. We performed motion tests in regular waves by use of two box shaped bodies which were supposed to have three-dimensional effects, and these results were compared with the calculation results from both two and three-dimensional methods. From these comparisons, it can be said that the responses of transverse motion as estimated by the ordinary strip method (OSM) using the two-dimensional hydrodynamic coefficients is sufficiently accurate. It was also found that for the longitudinal motion, the inversed strip method, in which the length is replaced by the width of the body, is also effective. In case of the drifting force, we obtained negative values in low frequency range.
社団法人日本船舶海洋工学会の論文
1982-06-30