2次元物体に働く非線形流体力について : 第4報波浪中の浮体動揺

概要

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The second-order forces acting on a fixed or free-floating two-dimensional body at a free surface are calculated on the basis of the perturbation theory. The first and second-order boundary value problems are solved by the Boundary Element Method (BEM) which includes both boundaries of the body and the free surfaces. The pressure distribution including the quadratic terms of the Bernoulli equation is evaluated from the solution. The hydrodynamic forces acting on the body are obtained by the integration along the instantaneous wetted contour of the body. Finally, motions of the body in waves are determined by the solution of the equation of the motion up to the second order. Experiments are carried out for the diffraction problems of a fixed or free-floating Lewis-form cylinder in steep regular waves. Those results are discussed in comparison with the numerical calculations. The steady_ heeling angles of the free-floating cylinder in waves are observed in the experiments as are predicted by the calculation.
社団法人日本船舶海洋工学会の論文