Pages 29-36
This paper presents optimization of tanker stern form based on viscous flow information obtained from Computational Fluid Dynamics. The numerical method is based on coupling of Reynolds-averaged Navier-Stokes equation solver and nonlinear programming technique, i.e., finite-analytic discretization and PISO-type velocity/pressure coupling method, and successive quadratic programming, respectively. In this lst report, minimization of viscous resistance is considered and stern form of a given tanker hull is optimized with inequality constrains such that displacement of the modified hull is equal or larger than that of the original, and the profile and maximum beam length as well as depth of the modified hull are same as those of the original. In the following, overview of the present numerical method is described and results are presented for optimization of SR221b tanker hull, including discussion of identification or salient differences of geometries and flows between the original and optimized hull forms. In addition, trends of modification of the stern form are evaluated by a viewpoint of tanker-hull-form designer. In conclusion, the present method appeared to successfully optimize the given tanker stern form, and a good agreement is demonstrated between trends displayed in the present modification and those commonly in use in actual tanker hull form design.
