| 英文摘要 |
Traditionally, naval architects have based new hull designs on hulls already in service and known to perform well (i.e. parent ship), with any changes to the design being investigated using expensive model towing tank tests. In recent years advances in computational fluid dynamics have made possible the analysis of new, possible novel, hull forms at a fraction of the cost of model tests, with good estimates of the hydrodynamic forces acting on the vessel being obtained.
The use of computational techniques, however, requires a numerical description of the hull shape. Various methods of defining the complex free-form shape of hulls for use in design optimization methods can be found in the literature. However two user friendly methods of surface representation commonly used in the field of computer-aided design are Bezier and B-spline surface patches. Due to their simplicity, B-spline surface technique is used in this study.
The objective of the present study is to design a vortex generator for a fishing baot such that the drag force can be reduced and the saving of the energy can be greatly improved. |