In this research, the resistance of the traditional Vietnamese fishing vessels was studied numerically using computational fluid dynamics (CFD) approach and based on these results their hull forms were optimized. In this approach, finite volume method was used to discretize the governing equations for incompressible viscous flow around the vessel. The Reynolds- Averaged Navier-Stokes equations (RANSE) were solved with the Realizable k-model and the SSTk-model. Moreover, the volume of fluid method was employed to capture the free surface. The SIMPLE algorithm was chosen to iterate the fields of the velocity and pressure. Two traditional typical Vietnamese fishing vessels named M1317A (Pattern 1), M1319 (Pattern 2) which were tested in towing tank by Vietnamese researchers were chosen as the pattern vessels to perform all computations. The stern shapes of two hulls are different with Pattern 1 has a stern bulb while Pattern 2 has a straight one. The total resistance, wave pattern, wake distribution on the propeller plane, and the streamlines of two hull forms of these fishing vessels were compared and showed that wave-making resistance was about twice as much as the frictional resistance, and the stern form of Pattern 2 induces a more homogeneous nominal wake. And we found that Realizable k- model is more realizable and accurate.
Volume 12 | 03-Special Issue