Ship resistance and powering prediction of a fishing vessel

The ship resistance and powering are the most important hydrodynamics performances. In the case of a fishing vessel, both the design speed and trawling speed conditions must be analysed. The ship resistance and powering prediction at design speed were performed in this paper, on the basis of the Holtrop-Mennen method, by using two specific CAD-CAE platforms: AVEVA MARINE (Initial Design module) and PHP (developed in the Naval Architecture Faculty of "Dunărea de Jos" University of Galati). A comparative analysis of the theoretical prediction of the fishing vessel resistance, at full loading condition, with experimental results obtained at the model resistance tests, was presented and the level of accuracy was evaluated. Significant differences were determined between theoretical and experimental results. Also, the trawling condition was analysed. The trawl resistance was estimated on the basis of the typical empirical relations and the simulation software Trawl Vision Software (TVS), developed by AcruxSoft. A considerable increase of the trawl resistance with the ship speed was observed. The trawling speed was calculated on the basis of the brake power necessary for the design speed condition. Taking into account both the ship resistance and trawl resistance estimation, an increase in the accuracy level of the theoretical methods must be performed. Also, numerical and experimental researches must be developed related to the influence of the typical geometry of the trawl, on the resistance performance.