Development of CAD/CFD/Optimizer-Integrated Hull-Form Design System

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This paper concerns development of a CAD/CFD/optimizer-integrated hull-form design System. The CAD, CFD, and optimizer modules are functionally independent and basically replaceable. Main objective of the present study is system development and demonstration of the capability, which justifies use of relatively simple flow and free-surface models, static sinkage and trim, and simplified design constraints. The CAD and CFD methods used in the present study are NAPA and a Rankine-source panel method, respectively. Currently, two nonlinear optimization algorithms are implemented, i.e., the successive quadratic programming (SQP) and the genetic algorithm (GA); and results are presented for the former in the present paper. For demonstration of the present approach, the bulbous bow optimization of container ship for minimum wavemaking resistance is considered. It appeared that the present CAD-based hull form modification overcomes many issues related to unrealistic solutions often seen in the related studies, which is due to the use of insufficient hull form modification methods. In conclusion, the present system has been shown very promising and warrants further investigation for more practical design constraints and conditions.

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