CFDによるタンカー船型の船尾形状最適化 : (第2報) : 伝達馬力最小化

抄録

This paper presents optimization of tanker stern form based on viscous flow information obtained from Computational Fluid Dynamics. In this 2nd report, main focus is placed on minimization of delivered horse power at constant ship speed originally designed, and it is shown that a single objective function proposed in the present study is capable for it. The numerical method is based on extension and modification of the method presented in the 1st report on minimization of viscous resistance, i.e., coupling of Reynolds-averaged Navier-Stokes (RaNS) equation solver and successive quadratic programming. Accuracy of RaNS solver in prediction of near wake field is improved by modification of turbulence model. Constraints considered in the present study are basically same as those used in the lst report, i.e., geometrical requirements of optimized hull for displacement, profile, maximum beam and depth, and stern frame line to secure enough space for engine room. In conclusion, the present method appeared to successfully optimize the given tanker stern form, and the modification trends automatically demonstrated in the present work agree well with those commonly in use in traditional tanker hull form design.