HYDRODYNAMIC ANALYSIS (CFD) OF A HULL RIGGED WITH NEW STABILIZINGSYSTEMS

The present job is based on a fluid dynamic analysis of a fast type of naval unit during the navigation. In particular, the fluid dynamic behaviour of the appendages and of the hull of a ship has been analysed by the means of the CFD FLUENT code. The results obtained by this kind of analysis represent an important support to a correct naval design based on experimental data. The main goal is the development of a more complete methodology related to the naval design, based on the application of an advanced calculation CFD code. The successive validity of this calculation methodology will concur in future to plan ships technologically more and more advanced also with the necessary scientific contribution. The scope of the present research is to find, between many conditions of navigability, which one can produce the better squatting from a fluid dynamic point of view, paying attention to those parameters that have influence on the behaviour of the ship during navigation. This methodology of planning, moreover innovative, let to control indeed, already in the planning phase of the hull, if appendix and other immersed parts of the ship, work in optimal conditions, in such way to eliminate, or at least to reduce lessened the undesired effects that can be born during navigation. Four different models have been analysed: the first one, hull with slanted fins of 2.5°; the second one hull with slanted fins of 5°; the third one, complete hull with slanted fins of 5° and slanted wings of 6°; and the last one complete hull with slanted fins of 5° and slanted wings of 12°. The better squatting, among the analysed cases, insures a good compromise between the incremented stabilizing contribution and the creation of low turbulences, low pressures, absence of depressions and reduced speed of the fluid particles, so far to strongly limit the formation of vortices and, therefore, propulsive energy dissipation.