2次元任意形状浮体の定常動揺問題の解法とその精度について

概要

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The precizeness of the various hydrodynamic solutions of the two-dimensional oscillating floating-bodies with arbitrary shapes is examined. The methods of the solution which are used in this paper are as follows: a) Integral-Equation Method with Irregular Frequency (Abbriviated OSD) b) Integral-Equation Method without Irregular Frequency (MSD) c) Multipole Expansion Method with n-Parameters Conformal Mapping (GUT) d) Multipole Expansion Method without Conformal Mapping (DME) e) Hybrid Multipole Expansion Method (HME) The examined results show the followings: i) In the complex shapes the irregular frequencies disturb the preciseness of the calculation. Ogilvie's method) is usefull to remove the irregular frequencies from the integral-equation method. ii) GUT gives the correct solution in much less calculation time compared with the OSD or MSD. But, if we have a even slight difference between a given shape and the one inversely-mapped from the circle, the solution is not always good. iii) DME in which the boundary condition is satisfied just on the body gives fairly good solutions if the shape of a given body is near a circle. iv) HME which combine GUT with DME gives very hopeful results.
社団法人日本船舶海洋工学会の論文
1982-12-30