船体接触の原因となる船位相互状況に関する流体力学的考察(日本航海学会第41回講演会)

概要

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Assuming the fluid perfect, the two-dimensional calculations are obtained for the forces and moments, which act on the body from the surrounding fluid, when the motion is not steady. The effects on one elliptic cylinder are approximately calculated by means of the image method and the conformal representation, when there exist two elliptic cyinders, which may be moving with any velocity in any direcion respectively. The forces and moments consist in two parts, the one (P_1 and M_1) due to the instantaneous stream line condition, the other (P_2 and M_2) due to the unsteady condition of flow, that is, the rate of change of velocity potential on the surface of the cylinder. One elliptic cylinder represented by C_1, the long axis=2a(1+C^2_1/a^2) and the short one=2a(1-C^2_1/a^2), is moving with U in direction of the long axis. The other cylinder by C_2, the long axis=2b(1+C^2_2/b^2) and the short one=2b(1-C^2_2/b^2), in position of f.e^<iβ> from C_1, is going with V in direction of the long axis angling α with U. The force and moment on the C_1 cylinder are approximately [numerical formula] direction (from the course of motion): π+3β-2α [numerical formula] where, s=V/U, k=b/a, σ=a/f, ・x_1=C_1/a ρ: density of fluid From these results, some simple cases are considered and the forces and moments are shown in Figs.
社団法人日本航海学会の論文
1969-12-30